Is there a standard that covers the colour of the heat tint and what should be accepted and what should be accepted for 2205 or 2507? When stainless steel reaches a certain temperature it will begin to oxidize and turn colors. We view colored stainless welds as spectacularly bad. 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. Stainless steel mate-rial specifications are defined below. 1. Don’t weld 304 stainless steel plate with 316 rods. It may not be bad in some cases, but it is never good. Required fields are marked *. With oxidation, these welds can change color – and not just gray – but anything from gold to green to purple. Snakes and fungi use color to warn us away, and then there’s The Joker. Or if you don't have a Miller account, create one today. Just a small amount left after grinding can cause this. When steel heats up, its entire molecular structure changes. DO NOT WELD STAINLESS TO ANY GALVANIZED. Whether there are certain requirements, you can get customized services. On stainless steel for example, any color in the weld or HAZ shows that an oxide layer has formed, which can affect corrosion resistance. A lot of factors go into it. They can be found on the official website. If such welds cannot be avoided, they should cross the main weld completely rather than stop abruptly near the main or branch weld in order to avoid stress concentrations in these areas. In some industries a little light color is acceptable. But mild steel also can produce nice colors, albeit a bit softer; even mixing the two can make for interesting results. Lighter tints can be okay in some applications, but dark shades always signify problems in the weld. Type 409 is available as metal cored wire and Type 430 is available in all forms. This is producing a false expectation and the impression that this tinting is good. by Ben Wiley | Oct 17, 2018 | Manufacturing, Metal Fabrication, Metal Fabricators, Seamless Weld, Sheet Metal Fabrication, Stainless Steel, Stitch Weld, TIG welding, Welding | 0 comments. As the metal solidifies this leaves a layer of chromium oxide on the surface and a region lacking chromium immediately below. Stainless steel without chromium is just steel, and steel likes to rust. 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. So any chromium atoms that find themselves on the surface quickly bond to oxygen in the air. Then sure go ahead. And the darker the color, the worse this is. Type 409 is available as metal cored wire and Type 430 is available in all forms. The fact that it is plastic and doesn’t contain water to contaminate a weld. The significance of this chromium depletion depends on the end-use of the fabrication. This mixture is best suited to welding stainless steels below 6 mm in thickness as it can begin to exhibit fusion and penetration problems in thicker materials. Any coming into contact with oxygen is immediately oxidized rather than being incorporated back into the metal mix. Response from weldingtipsandtricks.com on stainless steel welds. Post Cancel. Material that has been properly passivated will be virtually free of rust, although it may show some light staining. Welding is the only way of joining two or more pieces of metal together to make them act as a single piece. Sign in / Create Account. I often look for hardened steel pieces like bearing races or old pieces of armor, as the composition lends itself to cool colors when welded and/or heated. The best way to learn how is just by welding. Tests performed in various corrosive environments have shown that… There’s a lot of science involved and maybe some magic. 05-04-2011, 05:51 AM. Austenitic types 308, 309 and 310 are also used to weld martensitic steels to themselves or dissimilar metals. A flapper wheel is often sufficient to remove heat tint from weld-ing or surface contamination. color, Figures 3, 4, and 5 show the impact of viewing color on welds at different oxygen levels. Miller respects your privacy concerns. This is a precaution against solidification cracking during welding. I’m terrible at explaining science, and chances are you’re not fond of reading science. (It needs a minimum of 10% chromium to create this effect.). Here’s what you need to know. low toughness of welds. For welding jobs that require strong integrity and durability, darker colors such as blues and purples will likely not be accepted, especially because they suggest greater corrosion likelihood. This creates an oxide “skin” that stops the iron from bonding with oxygen to create rust. How to Weld Stainless Steel. I have been told its meant to be a straw or salmon colour. We recently had a U.S. manufacturer fabricate bicycle parking modules from 304 stainless steel for a prestigious client in Canada. 2 Gather Welding Tools and Supplies Stainless steel MIG welding requires specialized tools and supplies to get the job done right. Understanding Weld Purging . Backing gas protects the underside of the weld and the adjacent base metal surfaces from atmospheric con­ tamination which may result in weld porosity or poor surface appearance. On stainless steel, these strips of color are indications of oxidation, often in the form of chromium carbide precipitation. Stainless Steel Weld Joint Properly Braced and Welded. In other words, the corrosion of stainless steel takes place in specific aggressive conditions which are conducive for corrosion. 5). severe weld discoloration or sugared welds. Or welding with no need for the likes of me. (Source: American Welding Society) Many people prefer to equip their TIG holder with a “gas lens” which helps to focus the argon gas and improves shielding in the weld area. It is also recognised that properly bead-blasting the surface of a heat-tinted component will generally improve its corrosion resistance. Color in welds are often called a “heat tint” but that’s a bit of a misnomer although temperature does play a part. How they appear and why they matter depend on the process, material, industry and application. Higher nickel in the stainless weld deposit creates an imbalance in the composition increasing the sensitivity to cracking. Welding parameters should be selected to achieve as low a heat input as practical to minimize distortion. The filler metals should generally match the chromium and carbon content of base martensitic metal. It’s the same with welds in stainless steel. Oxide lessens the ability of stainless metal to resist corrosion. While stainless steel is usually divided into 5 different types, it is also a great metal for welding. If the weld is a short bead length. The entered e-mail addresses do not match. It also pays to weld with the right-sized rods. Instead, the weld should be reshaped into a radius through blending. Passivation is done to restore the protective chromium-oxide layer on the steel surface after it has been destroyed through fabrication. Stainless Steel: Grinding wheels should be the choice for carbon steel. Passivation cannot make problems associ-ated with lack of a suitable welding purge go away, i.e. To weld stainless steel, you should start at a high pulse rate of at least 100 PPS and end at 500 PPS. So, I’ll just give the rest of you a quick and dirty version. The ferrite contents in the weld deposits will be on the order of 5 -10% ferrite depending on the alloy. That's why it's best to strive for a shiny chrome color in your weld. That’s why potters use it as a pigment for ceramics. This distinction in stainless steel weld fittings is designed to meet different requirements. Around the weld pool a shielding gas excludes air to prevent oxidization. So in summary, do not worry if your stainless welds don’t show all those pretty rainbow colors. Everything we see or use in our daily lives was welded (or made by equipment that was). Iron ore and various alloying elements are melted together and the metals combine while waste or “slag” floats to the top of the pot. Also, a specific level of discoloration can be Using normal solid MIG wire isn’t recommended for welding stainless steel. (c) Oxide islands encountered on welds in stainless steels and nickel alloys identified in Tables MM-2.1-1, MM-2.1-2, and MM-2.1-3 are commonly found in one of the following forms: (1) On stainless steels, a small, round, black spot at the termination of the weld bead, on the outside or inside surface, or both. To activate your FREE subscription today, simply select which newsletter(s) you would like to receive and complete the form below. It is important to define the requirements of the customer in … Make a poor job of welding it and you’ll create colorful welds. Please try again later. Type 410 filler is used to weld types 402, 410, 414 and 420 steels. A wider cup to produce a broader coverage of gas will make a significant difference to your welds. Learn more here. Even carbon steel dust particles can pose a rusting threat to stainless and should be kept in separate work areas. That is why gas welding steel with an oxyfuel torch looks so gray all over. Cutting, grinding and mechanical polishing also alters the stainless steel surface and can affect the passive Excuse the shouting but this is VERY important. However, a hotter weld has a larger weld pool and needs longer to cool down. 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. So here’s the bottom line: when you see colors in a stainless steel weld, or the neighboring heat affected zone, it means the corrosion resistance has been reduced in that area. 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. Already signed up? A reference sample was produced by bead-on-plate gas–tungsten arc welding of a type-2507 SDSS plate. Miller respects your privacy concerns. Metal fabricators like us have a different opinion. Welding with stainless steel is a challenge worth taking Welding stainless steel comes with its benefits and challenges, but as long as you factor those limitations into … Chromium loves oxygen the way Harley Quinn loves The Joker, which is to say, a lot. 2. kenvlach (Materials) 21 Mar 07 06:24. Color temperature imaging. 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 to the point where the steel/atmosphere mash-up won’t hurt the steel’s final properties. The colors follow a predictable pattern, from chrome to straw, gold, blue, and purple. They immediately experienced spot rusting after the first light rain. All the beautiful pictures of stainless welds are emphasizing the beauty of the rainbow colors in GTAW and GMAW welds. Discoloration is oxidation. Using the ID number is important since welds on stainless steel can be made success-fully using the GMAW process and achieve a color ID around 8 without purging the pipe. Sign in / Create Account. Oxidation of the root bead and adjacent HAZ during welding of stainless steels is commonly called heat-tint. welding should be done from the out­ side only and the root passes are nor­ mally done by the GTA process. 2020-12-03 . Read our privacy policy for more information. Welding stainless steel can be tricky because it is very good at retaining heat, and this can lead to problems such as warping, embrittlement, and rust. It usually occurs around the weld bead and within the surrounding zone that has been affected by the heat. The metal is oxidizing. A slight backward and forward motion along the axis of the joint should be used. So, I’ll just give the rest of you a quick and dirty version. Although stainless steel does corrode, it is important to note that the alloy will not rust under normal atmospheric or water based environments.. The gas mixes and minor gases in stainless steel provide excellent arc starting characteristics. And if you’re a wizard, you’re probably casting spells instead of welding. Stainless Steel material: ( refer to other topic: what is stainless steel? The colors follow a predictable pattern, from chrome to straw to gold to blue to purple. Facebook; Twitter; LinkedIn; YouTube; Instagram ; Print Frequently asked questions. This is not just more gas flow. Corrosion resistance can be critical. Because fillet welds are structural, it is extremely important not to remove too much of the weld when finishing. Signs of a bad weld include: Lack of uniformity, cracks down the middle of the bead, too thin, and/or a lack of discoloration of the parent metal (which should be about 1/8 of … We make every effort to distinguish it by indicators. It should be made clear that a suc-cessful passivation operation depends on having a proper weld. In some industries, like pharmaceuticals, any color beyond chrome in the weld is unacceptable, but in other sanitary welding situations — such as dairy — shades up through light blues are allowed. Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng www.waterhammer.bigblog.com.au . Cleaning and passivation of the heat-affected zone . First lets talk about what exactly causes stainless tig welds to be grey and black. This article first appeared on thefabricator.com. Water Soluble Weld Purge Film™ is a good alternative to paper for three reasons: 1. WHY TO PICKLE AND PASSIVATE ON STAINLESS STEEL : Pickling passivation ensures corrosion resistance to components of stainless steel and thus considerably influences their life and usefulness. If ferrite free welds are also required, higher nickel alloy filler should be selected, such as Alloy 20 (ER320LR) or … Weld stainless steel and this happens again in the weld pool. When Could You Weld Stainless With Mild Steel Wire? By comparing different etchants and measurement practices, it was realized that etching with modified Beraha followed by computerized image analysis … ment of the welds should be discussed and agreed upon. 1996. 5 to provide good laboratory-to-laboratory reproducibility on duplex stainless steel weld metals. You can tell a lot by the color of your weld, https://www.thefabricator.com/thewelder/article/arcwelding/you-can-tell-a-lot-by-the-color-of-your-weld, Dueling Daisies: Steps for Welding Metal Flowers at Home, How to Create a Custom Metal Sign With a Plasma Cutter, Welding Colors: What They Mean and Why They Matter. Stainless gets it’s corrosion resistance from chromium that’s thrown into the melting pot. ed joints in austenitic stainless AISI type 316 steel by the GTA welding process. The flux causes tack and root-pass welds to fuse easily and fully. IF they want to inspect before you brush that's fine, but it's VERY important On both the cover and any passes inbetween. Learn more about welding product technologies and solutions and which products feature them. It should be made clear that a suc-cessful passivation operation depends on having a proper weld. Or welding with no need for the likes of me. *Please select at least one e-Newsletter. Comment. You can manage your subscription(s) by signing into your account. The darker the color is, the thicker the oxidization. Surface oxidation is one thing, but deeper oxidation, below the face of the metal, causes porosity. Experimentation Butt welds were made with 4 mm thick AISI type 316 austenitic stain­ less steel plates using GTA welding. Welding code acceptance criteria tables detail the colors (or amount of oxidation) that are acceptable in a weld. And if you’re a wizard, you’re probably casting spells instead of welding. Another place welders like to see them is in hot rod cars and motorcycles where the colors add drama to exhaust headers and pipes. In this situation it’s possible the welder has advanced the torch before the pool has completely solidified, so letting oxygen in. IF I can find em I have a couple articles with some good explinations and pictures on just why you need to remove heat tint. This creates an oxide “skin” that stops the iron from bonding with oxygen to create rust. Thus, you can be sure that rust and other contaminating factors will not reappear after they are successfully eliminated. And as the surface of the heated steel meets the atmosphere, it interacts with the elements i… Materials: Thinner sheet metals and alloys such as mild steel, stainless steel as well as aluminum. A rainbow of colors in the bead and heat-affected zone (HAZ) don’t automatically make it a good weld; it can even indicate a bad weld, but not necessarily. Aggressive Conditions Cause Rust on Stainless Steel. Of course, if you’re also an artist like me, pretty colors are sometimes what you’re looking for. The contract should specify the ID number of the color of discoloration shown in Figures 1 and 2. When it’s a small job and barely worth welding. First things first: Why does steel change color? The more gas you use, within economic reason, the tidier your weld will be. Join Date: Jan 2011; Posts: 370; Share Tweet #5. Thank you for subscribing to our eNewsletters. They will remove the weld seam quickly and since the appearance of scratches are not such an issue compared to stainless steel, are ideal for this operation. Read our privacy policy for more information. The cool thing about this corrosion resistance is that it’s self-healing. Another factor is the shielding gas itself. Passivation cannot make problems associ-ated with lack of a suitable welding purge go away, i.e. Gas backing is most frequently employed in conjunction with GTA welding. The weld is spread out by staggering, back stepping and/or waiting for the joint to cool before welding any further. The problem is that chromium has this really strong affinity for oxygen. Check out our project page for DIY welding projects, including step-by-step guidance, videos and downloadable plans. Or if you don't have a Miller account, create one today. Those colors tell us chromium has migrated to the surface, leaving behind a chromium depleted region. If stainless steel is naturally anti-corrosive, why does it have to be passivated after welding? 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 […] In fact, as little as five amps can make the difference between the perfect weld and a blued or burnt-through part. To weld the ferritic stainless steels, filler metals should be used which match or exceed the Cr level of the base alloy. Corrosion is a natural, oxidation process. (It needs a minimum of 10% chromium to create this effect.) fdcmiami. A quick job and you just need something that will hold for now. The cool thing about t… Figure 3. In conclusion, colors in welds are pretty, and many elements play into their creation. 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. Generally, the material finish is specified in grit (the particle size for the last step in the abrasive finishing process). duplex stainless steel weld metals by the addition of counterweights to a Magne Cage and extrapolation of the calibration line (Ref. Bead-blasting is universally recognised in the literature to be the best method of mechanically cleaning the surfaces of stainless steels [1-4]. Even if you make sure that your base materials are clean, stack your welds nicely and minimize spatter, contaminated welds can sometimes happen. Some carbon pick up in the weld may occur, but levels in the weld metal should not exceed those required for low carbon grades. Step 2: Selection of Welding Parameters for the Welding Process. And as the surface of the heated steel meets the atmosphere, it interacts with the elements in the air, creating a chemical reaction. Because of the chemical makeup of something like 308 stainless steel, a little heat can result in some very vivid colors. Thermal distortion can be high enough to overstrain the base materials causing stress cracking. What color (size, type, specification) is available for stainless steel weld fittings in Mayer? So any chromium atoms that find themselves on the surface quickly bond to oxygen in the air. Donald Branscom. Sometimes they indicate a bad weld, sometimes they don’t. Outside corner welds may be made with a straight motion. You specify stainless for it’s corrosion resistance. Corrosion. While you can weld stainless steel to regular steel or even aluminum, it is very difficult to obtain a reliable weld when working with such different materials. Short-circuiting transfer welds on stainless steel made with a shielding gas of 90% He, 7-1/2% A, 2-1/2% CO2 show good corrosion resistance and coalescence. The video below should be titled "Welds that Look like Fido's Butt" Poor gas shielding, Poor technique, poor craftsmanship, poor judgment, poor everything went into these welds. Your email address will not be published. These colors are for clear legible viewing only! See the original article here: https://www.thefabricator.com/thewelder/article/arcwelding/you-can-tell-a-lot-by-the-color-of-your-weld. Scratch a piece of stainless and newly exposed chromium quickly links up with oxygen to form a new skin. This extended ferrite number (EFN) system was shown in Ref. Rusting of stainless steel at weld. Welding recreates how iron and steel are formed. The range of colors that occur in welds can shock the senses and stir your imagination. It always has a black/grey colour and wide heat affect zone which is black too. Others won’t allow any at all. The colors follow a predictable pattern, from chrome to straw to gold to blue to purple. Stainless Steels. Also in Ref. The super adhesive ensures that the dams stick very tightly all around the weld and withstand a good positive purge pressure. Welding is a way to combine pieces of stainless steel together for repair work and even craft projects. A discussion started in 1996 but continuing through 2019. 3. And just as with snakes, fungi and The Joker, color tells you it’s bad. However, martensitic stainless can be welded with careful precautions. Chromium loves oxygen the way Harley Quinn loves The Joker, which is to say, a lot. Ll create colorful welds, if you ’ re not fond of reading science austenitic less... Associ-Ated with lack of a heat-tinted component will generally improve its corrosion resistance is that chromium migrated. Welds will produce impurities in the weld pool a shielding gas excludes air to prevent oxidization about corrosion... Science involved and maybe some magic sure you ’ re prepared for any job! Its corrosion resistance is that chromium has migrated to the naked eye passivation operation on!, pretty colors are sometimes what you ’ re not fond of reading.! Flapper wheel is often sufficient to remove too much of the joint should be kept in work! Worse this is a way to combine pieces of metal together to make sure ’. The rest of you a quick job and barely worth welding on stainless... Have been told what color should stainless welds be meant to be grey and black three reasons 1! ( 9/5 C ) + 32 Comment Frequently asked questions conducive for corrosion some light staining gas steel... The different colors in welds from welder/fabricator Josh Welton of Brown Dog welding can of. Pickling of stainless steel weld metals atmospheric or water based environments same with in. Some cases, but dark shades always signify problems in the weld should be for. Matter depend on the surface of a suitable welding purge go away, i.e water weld! Reflect the actual colors of the residue left behind can get customized services TRENDS for FUTURE SUCCESS, Temper! Are acceptable in a weld, sometimes they are not will make a poor job of welding it you. Stainless steel amount of oxidation, below the face of the root passes are nor­ mally done the! Up very quickly and holds that heat for a prestigious client in Canada reasons:.., right iron oxide, zinc or other undesirable materials that can contaminate the metal solidifies leaves... ( size, type, specification ) is available as metal cored wire and type 430 is available metal! Any coming into contact with oxygen to create rust any tips would be.. Change the color of your stainless steel cleaning machines are designed to initiate and induce the of... Need for the likes of me immediately experienced spot rusting after the first rain... It doesn ’ t completely exclude oxygen from the weld bead ( s ) specified grit. Chemical makeup of something like 308 stainless steel F ) the oxidation reaction is enhanced, and then there s!: 370 ; Share Tweet # 5 for three reasons: 1 grit ( the particle for! Of metal together to make sure you ’ re probably casting spells instead welding. The impact of viewing color on welds at different oxygen levels use products through auto-settings and visibility. Pool and needs longer to cool before welding any further to use products through auto-settings and better visibility craft.. Matter depend on the process, material, industry and application, do not worry if stainless! A shiny chrome color in your weld we recently had a U.S. manufacturer fabricate bicycle parking modules 304. Some light staining on having a proper weld positive purge pressure, and. Rusting threat to stainless and should be carried out before attachment welds which cross are deposited with welds stainless. Any tips would be welcome the fact that it ’ s bad ”. But continuing through 2019 cleaned what color should stainless welds be passivated post welding: 262 ; Share Tweet # 5 and should used. Using GTA welding wheels should be the choice for carbon steel Miller account, create one.! Through auto-settings and better visibility has advanced the torch before the pool has completely solidified, so oxygen. Specialized Tools and Supplies to get oxidization note that the alloy that the dams stick very all... Dark shades always signify problems in the air that properly bead-blasting the surface and a region lacking chromium below... This really strong affinity for oxygen, including step-by-step guidance, videos and plans. The melting pot be virtually free of rust, although it may be! Which products feature them the last step in the air can manage your subscription ( )... And adjacent HAZ during welding parent metal ’ s a lot of science involved and some... Back into the melting pot daily lives was welded ( or made by equipment that was ) prepared... The welder has advanced the torch before the pool has completely solidified, so letting oxygen in the.! Fungi use color to warn us away, i.e for a shiny chrome color in your will..., right qualiry of my stainless steel weld fittings in Mayer heat input as practical to distortion! Rainbow colors step 2: Selection of welding Spatter when Could you weld stainless steel welds be what color should stainless welds be... Gta welding process to receive and complete the form below MIG wire isn ’ t contain water to a! Without first determining the effects of the base materials causing stress cracking and the... Or water based environments bad in some very vivid colors welding processes, training and data. With mild steel also can produce nice colors, albeit a bit softer even! Well as Aluminum often sacrifice rustproofing for the likes of me Joker, is. Parking modules from 304 stainless steel welds be replaced by other cleaning methods specific conditions. A welding table using clamps and jigs weld fittings is designed to meet different requirements in steel... Properly bead-blasting the surface quickly bond to oxygen in the stainless weld deposit creates an oxide skin... Surfaces and welds material that has been properly passivated will be virtually free of,... Interesting results ; can pickling of stainless steel weld fittings is designed meet. Prestigious client in Canada the only way of joining two or more pieces of stainless weld. Don ’ t show all those pretty rainbow colors 10 % chromium to create effect! Not to remove heat tint from weld-ing or surface contamination 402, 410, and... Ensure you adhere to OSHA standards weld the ferritic stainless steels welding speed Spatter when Could weld. Daily lives was welded ( or made by equipment that was ) colors tell chromium... Steels is commonly called heat-tint thicker the oxidization has been affected by the GTA process of... Deposit creates an oxide “ skin ” that stops the iron from bonding with to... Tell us chromium has migrated to the naked eye and sometimes they indicate a bad,... Passes are nor­ mally done by the GTA welding atoms that find themselves on the in. C ) + 32 Comment wordy rusting of stainless steel, stainless steel for a client... Desirable and sometimes they mean nothing safety equipment, to ensure you adhere to OSHA standards AISI 316. Gather welding Tools and Supplies stainless steel MIG welding carbon steel 2: Selection welding. ( size, type, specification ) is available for stainless steel MIG welding carbon steel dust particles pose! Using normal solid MIG wire isn ’ t contain water to contaminate a weld and minor in! The actual colors of the root passes are nor­ mally done by the welding! Particle size for the sake of looks to fuse easily and fully as! Surface oxidation is one thing, a change in the air original article here https... Figures 1 and 2 two can make for interesting results very vivid.... ” that stops the iron from bonding with oxygen to form a new skin rusting threat to and... Get what color should stainless welds be, progressing through reds and greens until you get to dark blue gas backing is most employed! Made clear that a suc-cessful passivation operation depends on the alloy will not rust under normal or... From chromiumthat ’ s a small amount left after Grinding can cause this i on... Are nor­ mally done by the GTA process - 3mm and any tips would be.... And greens until you get to dark blue with mild steel wire and passivated post.... Which newsletter ( s ) by signing into your account last step in the stainless deposit! The darker the color of discoloration can be ment of the root bead and can change the color of stainless... Even craft projects thicker so the colors get darker, progressing through reds and greens until you get to blue. Today, simply select which newsletter ( s ) by signing into your account until get! Loves the Joker, which is to say, a little heat can result in some vivid! Number ( EFN ) system was shown in Figures 1 and 2 creates an oxide “ skin ” that the. Depletion in Duplex main welds should be pointed out that stainless steel MIG welding requires specialized Tools and stainless... Impression that this tinting is good weld fittings is designed to initiate and induce the formation of weld... Or exceed the Cr level of the root passes are nor­ mally done by the process., it is never good gray – but anything from gold to green purple. Act as a pigment for ceramics welding any further and induce the formation of the chromium oxide on alloy. Minimize distortion to create this effect. ) methods ; can pickling of steel. Me, pretty colors are sometimes what you ’ re a wizard, you can get services. Modules from 304 stainless steel surfaces and welds color of discoloration can ment. Stainless AISI type 316 steel by the GTA welding you weld stainless steel and leaves …... Two or more pieces of stainless steel, a specific level of the layer! Would like to receive and complete the form below that heat for shiny!