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Are there killed carbon steel pipe-fittings?
Yes. Argon gas welding is often used for killed steel welding to inhibit the oxidation of the steel.
Why purging required for stainless welding?
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.
Co2 oxygen both use same time in mig welding?
CO2 and O2 can not be used in the same time for shielding gas in MIG welding, it would create too much oxidation of the molten metal.
What is arc crater?
Arc crater is the depression in the molten metal created by the end of the welding electrode during the welding of metal.
Is welding a permanent bond?
used in aerospace and other high tech welds with lack of oxidation
