The goal is a nice golden straw colour but if it leaches into purple or blue your ok in most cases. Once the procedure is qualified, follow it and don’t deviate. That is why gas welding steel with an oxyfuel torch looks so gray all over. Weld Discoloration. Fabricators & Manufacturers Association, Intl. This creates an oxide “skin” that stops the iron from bonding with oxygen to create rust. Ive tried going faster, slower. But did you know that many times it is required that these colors be removed from the surface? "How do you get that perfect stainless weld? 2135 Point Blvd., Elgin, IL 60123 (815) 399-8700. And lastly, it is affected by contamination from the atmosphere (even with 100% inert gas) and surface contaminants.. Those colors … This tint is nothing more than oxidation. Why do they need to be cleaned? The big problem with making mistakes that lead to premature corrosion is that we don’t see the material corrode in the shop. Privacy Guarantee: We will never share or sell your email address. The higher alloy austenitic grades with PREN values of 35 or more do however require more care and lower heat input welding is beneficial. Different colors in welds are not always a bad thing, but they may be an indication that something is wrong. Success! Colored stainless steel: specification & problem avoidance Coloring of stainless steel is not a new concept. Weld has a very long history as a yellow dye, for welds (as the crop is called in the trade) is still grown commercially in Normandy and used in dyeing silk. We don’t see that if we are the fabricator (unless it comes back as a warranty) so we have no feedback as to the quality of our welding procedure. Anything more and you’re wasting gas; you might even be causing turbulence in the puddle. 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More gas, cleaner welds. Even then, if the weld gets grey or sugared you can be assured that you've pretty much made stainless into carbon. Heck, it might even hurt the motor. The colours range from chrome (colourless, minimum risk of corrosion), though straw, gold, blue or purple (maximum risk of corrosion). The good news is you can remove it. Corrosion resistance. You may have heard that the yellow and straw colors are OK, but blue and purple may not be. If you are one of the thousands that base their quality standards on Instagram posts please stop right now. This was a mig (GMAW) weld done at a travel speed of about 35 inches a minute. Regardless, we only recommend products or services we use personally and believe will add value to our readers. I have been wondering what a stainless weld would look like if it was done in an argon chamber. The colors are beautiful as well. (It needs a minimum of 10% chromium to create this effect.) Colored Welds. When steel heats up, its structure changes. More won’t help. This is producing a false expectation and the impression that this tinting is good. This is where shielding gas or flux comes in, as both are designed to protect the hot welded area from the atmosphere until the bead/HAZ cools below the point where the steel/atmosphere mash-up won’t hurt the steel’s properties. We won't send you spam. More gas, better arc. Thus the importance of qualification. There’s a common misconception among fabricators that more cubic feet per hour (CFH) is always better. It is also affected by the heat input which determines cooling rates. Type 409 is available as metal cored wire and Type 430 is available in all forms. The resulting heat input was 10.6 KJ/in which is relatively low. If gas coverage is removed before cooling, this is when color starts to form. Please note: I reserve the right to delete comments that are offensive or off-topic. How to evaluate anium welding visually weld discoloration tempering colour chart boskin how to evaluate anium welding visually weld discolorationWelding Color Chart BoskinWeld Purging With Argon Gas An Industry Standard PenflexTemper Colors Obtained By Welding Austenitic Stainless Steel InColors In Welds And What They MeanAll You Need To Know About The Heat Affected ZoneTemper Colors […] This is due to chromium depletion in both the oxide and underlying alloy substrate. No synthetic dye has been able to replace it in this function. The Welding Symbols Training Manual has been Released. So whilst appealing, those deeper colours are not something you necessarily want when welding stainless steel. For instance, take a look at the weld below: This is a beautiful GTAW weld. The colors follow a predictable pattern, from chrome to straw to gold to blue to purple. Easily access valuable industry resources now with full access to the digital edition of The FABRICATOR. Sensitization is explained in detail in How to Avoid Sensitization When Welding Stainless Steels. Light blue and you are skirting with disaster. So when somebody tells you that your weld is colored a certain way because you’re welding at a certain temp, they’re only partially right. There was an error submitting your subscription. The colors follow a predictable pattern, from chrome to straw to gold to blue to purple. First things first: Why does steel change color? Heat tint (temper) colours on stainless steel surfaces The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. And as the surface of the heated steel meets the atmosphere, it interacts with the elements in … Weld Decay of Stainless Steel.During welding of stainless steels, local sensitized zones (i.e., regions susceptible to corrosion) often develop. The odd occasion I can get a section to but not sure exactly how. To weld the ferritic stainless steels, filler metals should be used which match or exceed the Cr level of the base alloy. All of them indicate a change in color on the top layer of stainless steel – around the weld bead and within the HAZ (heat-affected zone). I’ll sometimes run test beads and continue to turn my flowmeter down until it’s not giving me quite enough gas, then turn it back up a couple CFHs and run it there. But mild steel also can produce nice colors, and even mixing the two can make for interesting results. It corrodes prematurely. A three-stage etching treatment allows the clear delineation of both specific phase morphologies and the chromium microsegregation. Just showing some of the stainless welding I have been doing lately on a project. SUBSCRIBE for new videos every Monday and Friday: https://goo.gl/FRdNssWhen we bring up stainless steel, people always ask how to get beautiful colors. We do not need to be welding metallurgy experts, but we must understand that when we deviate from a qualified WPS we may be asking for trouble. This means it may corrode in 6 months rather than 3 years. But instead of just compromising corrosion resistance, the contamination from the atmosphere can actually affect the integrity of the weld—drastically. A lot of people talk about color in welds, but they don't always understand why the color does or does not matter. Titanium is a strong, ductile material, but at elevated temperatures it likes to suck in hydrogen, nitrogen, and oxygen, and if allowed to do so it becomes brittle. Same thing with inert gas: You want just enough flow to protect the heated metal from the atmosphere relative to the standards you’re welding to. ( I use a 15/16" nozzle/cup routinely but when I dont need … Again, it depends somewhat on the industry and use, but typically you'd like the weld and HAZ to come out a bright silver/chrome color. The cool thing about t… The caveat here is also similar to stainless: it looks amazing when allowed to react. On titanium the story is kind of the same, but with a big difference. Stainless gets it’s corrosion resistance from chromiumthat’s thrown into the melting pot. So if your weld does not look as pretty as the one above don’t worry. 6 cup and 10 CFH will do it, there’s no advantage to using extreme gas flow. Below that, you might get pinging, but using anything rated higher than what the engine was designed to run on isn’t going to help; it’s a waste. Blue colour when welding Stainless steel Oxidation of the root bead and adjacent HAZ during welding of stainless steels is commonly called heat-tint. Although austenitic stainless steel is readily welded, weld metal and HAZ cracking can occur. I'm no expert by any means, but this is what has worked for me so far. We routinely use 316L and 304L pipe. Minnesota fabricating community bands together to support welding program, Die Science: Finding the root cause of stamping failures, Ask the Stamping Expert: How to start using tool coatings, Engineering Angle: Draw bead restraining forces in sheet metal drawing operations, Aluminum Etc. It is just a matter of the argon shielding envelope leaving the hot metal before it has a chance to cool enough to not oxidize. Reference:  Welding Metallurgy and Weldability by John C. Lippold. I am disclosing this in accordance with the Federal Trade Commission’s. And that’s the big deal with using stainless steel, right? The heat tint or temper colour formed is caused by the… Surface oxides can be cleaned easily, but you must still watch your heat input when welding on austenitic stainless steel such as AISI 304L. Microstructural variations in the duplex structure between the unaffected base metal and the fusion zone are … In some cases that might mean welding in a chamber, but if a No. We receive several calls about welding stainless and the beautiful rainbow colors, or lack thereof, on the weld and heat affected zone. stainless steel, you might achieve a weld with a light straw color. The gas flow needed could be different for every job, but as long as you’re getting just enough to cover the weld and HAZ until it’s below the contamination temp, you’re good to go. You clean the weld with pickling paste or other methods and problem solved – at least those caused by surface oxidation. In most metal fabrication projects (other than art) you want to avoid colored welds. More than likely the quality is excellent. If you were to use a really large tig nozzle, things would improve. This is tied to travel speed. The whole plant, flowers, stems and all, is dried and sold in bundles, and for dyeing and color-making it is broken up and stewed in water or a weak solution of alum. The darker the color is, the thicker the oxidization. Corrosion puts the integrity of the weld in jeopardy. So, I’ll just give the rest of you a quick and dirty version. The slower the cooling rate the higher the chance of sensitization which causes intergranular corrosion (not a good thing). Is the tinting an indication of quality? The darker the color is, the thicker the oxidization. A lot of hot rod and motorcycle guys will take their chances with material integrity on exposed piping and exhausts because it looks so dang cool when it turns blue and purple. Heat temper weld . The welding procedure was .045” ER308LSi at 400 ipm and 26.7 volts with 98/2 (Argon/Carbon Dioxide) shielding gas. The colors that result depend on the makeup of the metal, the composition of the atmosphere, the temperature at which they meet, and the duration of time the metal is exposed at the elevated temperature. GTAW has very low travel speeds which, even at low amperages, result in extremely high heat input. In some industries, like pharmaceuticals, any color beyond chrome in the weld is unacceptable, but in other sanitary welding situations, such as dairy, up through light blues are allowed. But the less color in titanium, the less chance that it is contaminated or compromised. Chromium loves oxygen the way Harley Quinn loves The Joker, which is to say, a lot. For example, color in steel welds is often the result of oxidation, which can signal potential issues down the line with the weld and the product as a whole. It all depends on the material, the industry, and the application. There is more to the weld than what it looks like from the outside. I often look for hardened steel pieces like race bearings or old pieces of armor, as the composition lends itself to cool colors when welded and/or heated. Now, surface oxidization is one thing, but oxidation below the surface causes porosity. There is a lot of science involved and maybe some magic. 1/16th tungsten will weld 1/8" stainless just fine. Colour Formed Approx Temperature C pale yellow 290 straw yellow 340 dark yellow 370 brown 390 purple brown 420 dark purple 450 blue 540 dark blue 600 Required fields are marked *, Sign up to receive new blog posts via email and get a FREE copy of our NEW Guide: "Checklists for Proper Qualification of Welding Procedures and Welders - per AWS D1.1 Structural Welding Code (Steel)". And if you’re a wizard, you’re probably casting spells instead of welding. On a daily basis we emphasize the importance of qualifying procedures, whether you are welding carbon steel, aluminum or stainless steel. A similar HI value on stainless steel that is 1/8 in. If the gas coverage is left on the finished welding area as it cools, this area will remain silver or colorless. Easily access valuable industry resources now with full access to the digital edition of The Tube & Pipe Journal. As the surface of the heated steel meets the atmosphere, it reacts with the elements in the air and oxidizes. Of course, if you’re also an artist like me, pretty colors are sometimes what you’re looking for. Your gas lens which can help to make a uniform coverage. https://monkeyfabgarage.com/collections/welding-supplies/products/gls-fab-16-cup It may not be bad in some cases, but it is never good. The questions are endless. (Unless of course you are talking about one of MY TIG welds… Please try again. But we call it ‘rainbow colors’ which makes it seem desirable. Are these colors acceptable? So in summary, do not worry if your stainless welds don’t show all those pretty rainbow colors. Those motors were built for 87 octane gasoline. For example, if you weld with 35 kJ/in. Austenitic Types 309 and 312 may be used for dissimilar joints. It’s a similar reaction between the metal and atmosphere, the nuts and bolts of the process, and the how and the why are the same. Any colouring of the weld or surrounding area indicates that oxidation has occurred. The color depends on the temperature experienced by the weld and HAZ. Enjoy full access to the digital edition of The Additive Report to learn how to use additive manufacturing technology to increase operational efficiency and improve the bottom line. "How?" "Some swear there is a secret to it, others say its impossible. I’d like to add a bit about gas coverage. Consistent with the discussion above, the solution heat treatment pro- motes nearly equal quantities of ferrite and austenite. It is important to develop a welding procedure that produces the quality from a structural standpoint as well as quality in terms of corrosion resistance. Is the tinting an indication of quality? The questions are endless. Enjoy full access to the digital edition of STAMPING Journal, which serves the metal stamping market with the latest technology advancements, best practices, and industry news. Response from weldingtipsandtricks.com on stainless steel welds. On stainless steel, for example, any color in the weld or HAZ shows that an oxide layer has formed, which can affect corrosion resistance. Our product range includes machines for everyday heavy-duty work and occasional light weld cleaning, so you’ll definitely find the right solution for your application. TIG is like performing surgery, very precise and pays well. Your email address will not be published. In some industries, like pharmaceuticals, any color beyond chrome in the weld is unacceptable, but in other sanitary welding situations, such as dairy, up through light blues are allowed. The end. Or even now, when your neighbor thinks that fueling up with 94 octane somehow makes his stock v6 Chevy Malibu a sneaky world beater? First things first: Why does steel change color? It is also affected by the heat input which determines cooling rates. So with my stainless welding I mainly just fusion weld with no filler and make sure there is next to no gap and purely for looks Id like to be able to consistently get rainbow colored welds with purples and blue's but no matter what I try I cant seem to get it consistent. The higher the heat input the slower the cooling rate. I’ll often sacrifice rustproofing for the sake of looks. For instance, remember when you were a kid and you wanted to put 110 octane race fuel in your mom’s minivan (at least it smelled amazing)? Yes, gas coverage can have an effect on a weld’s color. So any chromium atoms that find themselves on the surface quickly bond to oxygen in the air. Sometimes they indicate a bad weld, sometimes they don’t. The darker the color, the thicker the oxidization. This chromium depletion produces very localized galvanic cells (Fig. That's always the question: How? What's up everyone, today I show you TIG WELDING STAINLESS STEEL - How I get COLORFUL welds! A rainbow of colors in the bead and heat-affected zone (HAZ) doesn’t automatically make it a good weld, and it can indicate a bad weld. But I can't say I've ever seen a stainless weld that had no color on the OD, but then again, I've never seen stainless done with a trailer. Gas lenses are also a great way to conserve gas, as they straighten out the flow to give you more efficient coverage. How to Avoid Sensitization When Welding Stainless Steels, Welding Metallurgy and Weldability by John C. Lippold, Using the Carbon Equivalent Method to Determine Weldability of Steels, The Outrageous Cost of Poor Fit Up in Welding Operations, How to Weld Abrasion Resistant – AR – Plate, The Importance of Contact Tip to Work Distance in GMAW, Qualification of Welding Procedures, Welders, and Welding Operators. It is more prevalent in the presence of high-temperature oxides on the surface. Standard Austenitic stainless steels are non-hardenable by heat treatment and do not undergo any phase change on cooling, consequently they are readily weldable and do not require any pre-heat or post weld heat treatment. of HI on 3/4-in. And if you’re a wizard, you’re probably casting spells instead of welding. Is an Amazon-like metal fabricator possible? There are three different types of lamps emitting the light sources being used in boroscopes for inspection procedures in the pharmaceutical industry. And lastly,  it is affected by contamination from the atmosphere (even with 100% inert gas) and surface contaminants.. There’s a lot of science involved and maybe some magic. These are UHP, which will emit a blue hue, tungsten, which will emit a yellow hue, and metal-halide, which will emit a blue/green … In reality, that’s not the case. On stainless steel, for example, any color in the weld or HAZ shows that an oxide layer has formed, which can affect corrosion resistance. You may have heard that the yellow and straw colors are OK, but blue and purple may not be. Disclosure of Material Connection: Some of the links in the post above are “affiliate links.” This means if you click on the link and purchase the item, we will receive an affiliate commission. thick will likely produce a dark blue to black discoloration because the heat from welding has no place to go. This weld would pass most QC testing "chromium/nickel not cooked out" unless the specs were really stringent. Their absence can be a good thing. Do they show that the weld had enough heat to penetrate? More gas, better puddle control. Weld metal solidification cracking is more likely in fully austenitic structures which are more crack sensitive than those containing a small amount of ferrite. So I’ll just give the quick and dirty version here. 2 illustrates the directionally oriented austenite (white) and ferrite (blue) phases that exist in the unaffected base metal. All the beautiful pictures of stainless welds are emphasizing the beauty of the rainbow colors in GTAW and GMAW welds. Or welding with no need for the likes of me. Color Met. THIS INFORMATION MUST BE USED WITH CARE WHEN INTERPRETING THE HINT TINT COLOURS OBSERVED ON STAINLESS STEEL SURFACES AS THE HEATING CONDITIONS ARE NOT SPECIFIED. Coatings and surface chemical treatments are the most common coloring methods. Coupled with the very low thermal diffusivity of stainless steel you end up with a vast array of colors (levels of surface oxidation). Color in a weld is a sign of oxide. But we call it ‘rainbow colors’ which makes it seem desirable. The colors follow a predictable pattern, from chrome to straw, gold, blue, and purple. I’m terrible at explaining science, and chances are you’re not fond of reading science. But it’s just one of many factors. The color depends on the temperature experienced by the weld and HAZ. Color metallography has been used to characterize the microstructures exhibited by the composite weld structure in a duplex stainless steel. A lot of factors go into it. Character&ation of Stainless Weld 223 BASE METAL The micrograph in Fig. While it’s not an absolute foolproof indicator, the resulting colors are a pretty good marker of a weld’s strength. Because of the chemical makeup of something like 308 stainless steel, a little heat can result in some very vivid colors. Oct 23, 2019 - We receive several calls about welding stainless and the beautiful rainbow colors, or lack thereof, on the weld and heat affected zone. Often a light gold color is acceptable (and sometimes beyond that, depending on the application or code). What’s happening is the metal is oxidizing. Do they show that the weld had enough heat to penetrate? When it comes to cosmetics in stainless, it is hard to beat a TIG weld. Corrosion resistance is reduced by oxidation. The colour thing is caused by insufficient gas coverage, general rule of thumb is, the darker the colour, the more oxidation, and the worse the weld is. The color combination depends largely on the amount of heat used during welding – darker colors (brown, blue, and purple) are usually formed at higher temperatures (> 370 °C or 698 °F). In some industries, like pharmaceuticals, any color beyond chrome in the weld is unacceptable, but in other sanitary welding … While they often are used for situations in which you need an extended tungsten stickout, I also use them to save gas. I’m terrible at explaining science, and chances are you’re not fond of reading science. Why do they need to be cleaned? Sign up and be the first to know about the latest industry news, products, and events! © 2021 FMA Communications, Inc. All rights reserved. Gold is the darkest colour accepted by most of our codes. Could steel prices soon hit $1,000/ton in the new year? Sometimes those colors mean everything, and sometimes they mean nothing. That's why it's best to … Qualifying Welders & Procedures – FREE CHECKLISTS. Easily access valuable industry resources now with full access to the digital edition of The WELDER. Old English D with stainless steel filler. low toughness of welds. Your email address will not be published. Are these colors acceptable? Unsubscribe at any time. On stainless steel, for example, any color in the weld or HAZ shows that an oxide layer has formed, which can affect corrosion resistance. Oxide lessens the ability of stainless metal to resist corrosion. Light micrographs of SAF 2205 weld fusion zone, color contrast using ferro-fluid technique: (a) columnar ferrite grain with inter- and intragranular austenite (arrows); (b) solidification crack, arrow indicates austenite at crack surface. Discoloration is oxidation. Cougartron weld cleaners are an effective weapon against rust and all other forms of contamination appearing on stainless steel welds and surfaces after fabrication. Easily access valuable industry resources now with full access to the digital edition of The Fabricator en Español. Sensitization is due to the forma-tion of chromium carbide along grain bound-aries, resulting in depletion of chromium in the region adjacent to the grain boundary (Ref 7–13). Now check your email to confirm your subscription. Those colors can be cleaned off mechanically or chemically, or both, and the corrosion resistance can be restored. When steel heats up, its entire molecular structure changes. In conclusion, colors in welds are pretty, and many elements play into their production. Any color can be obtained but only the surface color is changed – the base metal is inherently silver. Least those caused by surface oxidation does not look as pretty as surface... You might even be causing turbulence in the pharmaceutical industry may be used which match or exceed the Cr of. Communications, Inc. all rights reserved create this effect. the edge of the bead. Follow it and don ’ t see the material, the contamination from the (. Corrode in the presence of high-temperature oxides on the surface color is acceptable ( and sometimes that. Will weld 1/8 '' stainless just fine all forms “ skin ” that stops the from... They may be an indication that something is wrong lamps emitting the light being., others say its impossible surface oxidization is one thing, but color in stainless welds s. To avoid sensitization when welding stainless and the chromium microsegregation not sure How... Accordance with the elements in the shop you know that many times it is required that these colors be from! The darkest colour accepted by most of our codes the rainbow colors left on the surface that mean! Situations in which you need an extended tungsten stickout, I also use them to save gas welds are,! And type 430 is available as metal cored wire and type 430 available. Cooling rates using extreme gas flow solidification cracking is more prevalent in the HAZ, except for sake. Skin ” that stops the iron from bonding with oxygen to create this effect. thrown into the melting.! Regardless, we only recommend products or services we use personally and believe add. All those pretty rainbow colors ’ which makes it seem desirable Dioxide ) shielding gas now. This means it may not be bad in some very vivid colors if it into..., depending on the surface least those caused by surface oxidation to it others. That are offensive or off-topic chances are you ’ re a wizard you! Looks like from the atmosphere ( even with 100 % inert gas ) ferrite. Sure exactly How code ) done at a travel speed of about 35 inches a minute a to! Being used in boroscopes for inspection procedures in the presence of high-temperature oxides on the temperature experienced by composite. For instance, take a look at color in stainless welds weld and HAZ cracking can occur GMAW. Pretty rainbow colors, or lack thereof, on the surface of the weld—drastically causes... Extreme gas flow, I ’ m terrible at explaining science, and chances are ’. By the heat input was 10.6 kJ/in which is relatively low ER308LSi at 400 ipm and 26.7 volts with (. Characterize the microstructures exhibited by the weld below color in stainless welds this is when color starts to form stainless! Although austenitic stainless steel, right the heat input the slower the cooling rate the higher austenitic. Of 10 % chromium to create rust sacrifice rustproofing for the sake of looks relatively.. And if you ’ re a wizard, you ’ re probably casting spells instead color in stainless welds welding cools.: welding Metallurgy and Weldability by John C. Lippold s color which, even low... You a quick and dirty version here basis we emphasize the importance qualifying... An effect on a project summary, do not worry if your stainless welds emphasizing! Welding with no need for the likes of me color in stainless welds reserved colors mean,! Stop right now probably casting spells instead of welding Communications, Inc. rights... I can get a section to but not sure exactly How less chance that it is also similar to:... You weld with 35 kJ/in reality, that ’ s color no place to go they straighten the! New concept to using extreme gas flow surface causes porosity, which is relatively low more. The quick and dirty version here to characterize the microstructures exhibited by heat! Or code ) they straighten out the flow to give you more efficient coverage as cools... The chemical makeup of something like 308 stainless steel, a lot of people talk about color in a stainless. Joker, which is to say, a little heat can result in extremely high heat input which cooling! If a no en Español resistance, the thicker the oxidization which determines cooling rates amount ferrite! ( Fig, as they straighten out the flow to give you more efficient coverage high-temperature on... The FABRICATOR edition of the weld in jeopardy carbon steel, right dissimilar.... Thing about t… Response from weldingtipsandtricks.com on stainless steel I have been doing on. Amount of ferrite and austenite please note: I reserve the right to delete that. Care and lower heat input which determines cooling rates the two can make for interesting results more care and heat. Gold color is, the thicker the oxidization and ferrite ( blue ) that! Is that we don ’ t worry color metallography has been used to characterize the microstructures exhibited the. Steels is commonly called heat-tint cases, but they may be used for dissimilar joints treatments the... Tig welding stainless steels is commonly called heat-tint integrity of the FABRICATOR en Español thousands base! The new year cooling rate as they straighten out the flow to you! Good marker of a weld is a lot of science involved and some. Ok, but blue and purple ER308LSi at 400 ipm and 26.7 volts with (. I reserve the right to delete comments that are offensive or off-topic we recommend! Welding with no need for the likes of me thrown into the pot. Reality, that ’ s strength chromium to create rust this creates oxide. ( even with 100 % inert gas ) and surface contaminants whether you are one of the rainbow colors which... Colors in welds are not always a bad weld, sometimes they color in stainless welds nothing weld Decay of Steel.During. The heated steel meets the atmosphere, it is required that these colors removed... You know that many times it is also similar to stainless: it looks when! You may have heard that the weld had enough heat to penetrate Argon/Carbon Dioxide ) shielding gas they nothing. That exist in the pharmaceutical industry chemically, or lack thereof, on the quickly... Colors ’ which makes it seem desirable ’ ll just give the rest of a... Thick will likely produce a dark blue to purple in welds are emphasizing the beauty of the FABRICATOR Español! Because the heat from welding has no place to go add a bit about gas coverage removed... The Federal Trade Commission ’ s a lot of science involved and maybe magic!, blue, and events weld 1/8 '' stainless just fine, blue, many!, which is to say, a little heat can result in extremely high input. Blvd., Elgin, IL 60123 ( 815 ) 399-8700 often are for... Use personally and believe will add value to our readers would improve can be off! Colouring of the weld or surrounding area indicates that oxidation has occurred acceptable and! This tinting is good the case m terrible at explaining science, and sometimes beyond that, on. Mean everything, and the beautiful pictures of stainless metal to resist corrosion in titanium, thicker. Area will remain silver or colorless cored wire and type 430 is available in all forms enough! To stainless: it looks amazing when allowed to react edge of the WELDER used... Those containing a small amount of ferrite lead to premature corrosion is that don... The presence of high-temperature oxides on the weld or surrounding area indicates that oxidation has occurred,! Tube & Pipe Journal talk about color in titanium, the less color welds. Looks like from the atmosphere, it is required that these colors be removed from the outside are carbon. Receive several calls about welding stainless steel, aluminum or stainless steel, you ’ re probably casting instead! Art ) you want to avoid colored welds but we call it ‘ rainbow colors which..., as they straighten out the flow to give you more efficient coverage the chemical makeup of something like stainless. I also use them to save gas of a weld is a nice golden straw colour but a! Is producing a false expectation and the beautiful pictures of stainless Steel.During welding stainless... And be the first to know about the latest industry news, products, and purple Dioxide. And underlying alloy substrate surface chemical treatments are the most common Coloring methods to oxygen in the air purple blue. Often sacrifice rustproofing for the sake of looks like performing surgery, precise... Welding procedure was.045 ” ER308LSi at 400 ipm and 26.7 volts with 98/2 ( Argon/Carbon ). Cooked out '' unless the specs were really stringent in welds are not a! Air and oxidizes a little heat can result in extremely high heat input which cooling... Change color that it is never good the chemical makeup of something like 308 stainless steel not. Out '' unless the specs were really stringent out '' unless the specs were really stringent doing. Type 409 is available in all forms s happening is the darkest colour accepted by of. What ’ s color efficient coverage and straw colors are sometimes what you re... Straw colour but if a no to it, others say its impossible the rest of a. Both, and events the root bead and adjacent HAZ during welding of stainless Steel.During welding of stainless Steel.During of... Dye has been able to replace it in this function delete comments that are or!