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During the welding of steels, oxidation occurs in the weld seam if oxygen reaches this area unhindered. This situation is even more acute with titanium, zirconium, molybdenum and other gas-reactive metals and alloys. The resulting oxidized surfaces are no longer corrosion-resistant, and further treatment is necessary.
Removing oxidation by grinding also removes the metal's passive protection against corrosion. Other mechanical procedures, such as brushing, blasting and pickling remove the oxidation, which restores corrosion resistance. However, in some cases such as pipe welding, removing oxidation after welding is difficult or impossible to do.
During pipe welding, oxides are usually located in areas that are almost impossible to access, such as in two 4-inch-diameter pipes that are each 10 feet long. Pickling will restore the corrosion resistance, but it is time-consuming and nearly impossible on a remote job site. Instead of removing oxidation, another solution is to prevent it from occurring in the first place. In essence, this is what purging tries to achieve.
With purging, a gas is used to protect the weld seam until it has cooled to the point that oxidation no longer can occur. Usually, an inert gas, such as argon which is heavier than air, is used. Other purging gases such as nitrogen and nitrogen/hydrogen blends can also be used.
What else can I help you with?
Which electrode is used to weld stainless steel to carbon steel?
It depends on the type of stainless steel. Stainless steels come in various compositions and are identified by numbers and letters. Electrodes should be chosen that match these. For example when welding 316 stainless use type 316 electrodes. In a lot of situations you can safely use the next higher number. 304 stainless can be welded with 308 electrodes, 308 stainless with 310 electrodes. 309 electrodes are generally used to weld stainless to carbon steel.
What is the best tig welding wire to use on 9010 cuni?
RN 67 if your welding 9010 to 9010 you will need RN 60 if welding cuni to carbon steel an if welding to stainless you will need RN 82
when b pressure welding is required?
B-Pressure welding is a specific certification which signifies the most elite welders in the industry. B-Pressure welding is required when more stringent techniques to welding are required. Many government agencies will only permit B-Pressure welders to perform certain tasks.
For ss welding which electrodes should be used?
This would depend on several variable such as: Welding process being used (SMAW, GMAW, etc). Specific type and grade of the Stainless Steel. The required tensile strength, ductility, and corrosion resistance. If you are welding pressure piping, the applicable ASME codes have a table in section IX. AWS D1.6 addresses structural applications. There are three basic types of Stainless Steels. Austenitic, Martensitic, and ferritic. Each has characteristics that differ from each other in the post welded condition. For a good selection of electrodes and their applications, your local welding supplier should have free reference books by various suppliers that will help. These are the same books we us to assist us in developing welding procedures to various codes and standards.
What is the welding procedure for welding P22 pipe to 304 stainless pipe?
I have not welded P22, but from what I read it is a low allow stainless that tends to get brittle. The welding techniques specified include a pre and post heat treat and on thicker materials a buffer layer of 316L with the final joint of 309 not sure what p22 pipe is but if it is carbon you should use a 308L filler with 100% argon purge 308L is a filler for fusing carbon steel and non carbon stainless. If it were 316 stainless you would want to use a 319 filler P22 is a steel alloy containing 2 1/4% chromium. It is weldable with most carbon steel alloy fillers such as E-70s2, ER-7018, etc. However, to weld it to a low grade stainless steel alloy such as 304, you would need to use a bi-metal welding alloy such as E-309, or ER-309. The above answer is incorrect regarding 308L being a filler for carbon steel to stainless steel. It is in fact 309 which is used for dissimilar metal welding when one component is stainless steel. I have also had good success welding two dissimilar metals together using inconel alloy welding electrodes such as INCO-182.
Is it required to do pickling and passivation on Tube to tube sheet welding on Stainless Steel Heat exchangers?
yes
What are deference between 309 and 308 welding rod?
309 stainless steel welding rod used to MS to SS 308 stainless steel welding rod only used to SS
What are the types of rods use for welding stainless steel?
all stainless steal is, is painted harden steel with a special paint. They usually do not weld stainless steal they are all shaped when forgedStainless steel is NOT painted steel, it is "stainless" because the surface alloy contains significant levels of chromium which resists corrosion. Standard welding can destroy this chrome-steel alloy surface, leaving it open to corrosion at the weld, however there are welding methods that work with stainless steel, like electrical spot welding.
Can you weld steel to stainless steel?
Yep, you can weld steel to stainless and you can weld stainless to steel. You can use steel or stainless welding rod in either case but the steel or steel welding rod will of course rust.
How does cold welding stainless steel differ from traditional welding methods?
Cold welding stainless steel differs from traditional welding methods in that it does not involve the use of heat to join the materials. Instead, cold welding relies on pressure to create a bond between the stainless steel surfaces. This process can result in a stronger and more precise weld, with minimal distortion and heat-affected zones compared to traditional welding methods.
What is the recommended range of welder amps for welding stainless steel?
The recommended range of welder amps for welding stainless steel is typically between 50 to 90 amps.
What is the recommended welder amperage for welding stainless steel?
The recommended welder amperage for welding stainless steel is typically between 50 to 90 amps, depending on the thickness of the stainless steel being welded. It is important to consult the welding machine's manual and adjust the amperage accordingly for best results.
What is a stainless steel welding rod?
Easy. A rod or electrode used in welding stainless steel. Or to "clad" a surface with stainless steel. (Nothing more than laying down a layer or layers of stainless.) MIG wire also comes in stainless steel. Their are different types of stainless steel and rods/wire/electrodes to use on them.
What has the author Tommi Jokinen written?
Tommi Jokinen has written: 'Novel ways of using Nd:YAG laser for welding thick section austenitic stainless steel' -- subject(s): Laser arc welding, Austenitic stainless steel, Welding
Name the metal used in welding shop?
A couple of metals that are used in a welding shop are carbon and stainless steel.
Does stainless steel welding require gass?
Most welding processes produce a gas to prevent oxidation of the weld.
Which electrode is used to weld stainless steel to carbon steel?
It depends on the type of stainless steel. Stainless steels come in various compositions and are identified by numbers and letters. Electrodes should be chosen that match these. For example when welding 316 stainless use type 316 electrodes. In a lot of situations you can safely use the next higher number. 304 stainless can be welded with 308 electrodes, 308 stainless with 310 electrodes. 309 electrodes are generally used to weld stainless to carbon steel.
