What does TIG stand for?
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Non-melting extremely inert gas shielded arc welding.
TIG welding (Tungsten Inert Gas Welding), also known as non-melting extremely inert gas shielded arc welding. Whether it is manual welding or automatic welding of 0.5 to 4.0mm thick stainless steel. TIG welding is the most commonly used welding method. TIG welding with filler wire is often used for bottom welding of pressure vessels. Because the air tightness of TIG welding is better and can reduce the pores in the weld seam during pressure vessel welding. The heat source of TIG welding is a DC arc, the working voltage is 10 to 95 volts, but the current can reach 600 amps. The correct connection method of the welding machine is that the workpiece is connected to the positive electrode of the power supply.And the tungsten electrode in the welding torch is used as the negative electrode. The inert gas is usually argon.
The inert gas is fed through the welding torch to form a shield around the arc and the welding pool. To increase heat input, 5% hydrogen is generally added to the argon. However, when welding ferritic stainless steel, hydrogen cannot be added in argon. Gas consumption is about 3 to 8 liters per minute. During the welding process, in addition to blowing inert gas from the welding torch, it is also best to blow in gas to protect the back of the weld from under the weld.
If necessary, the weld pool can be filled with welding wire having the same composition as the austenitic material to be welded. When welding ferritic stainless steel, type 316 filler is usually used.
Depending on whether the electrode melts during the welding process, gas shielded welding can be divided into non-melting electrode (tungsten electrode) gas shielded welding and melting electrode gas shielded welding.
Tungsten Inert Gas Welding
The former includes tungsten inert gas welding, plasma arc welding and atomic hydrogen welding. Atomic hydrogen welding is currently rarely used in production. Tungsten inert gas welding is abbreviated as TIG welding. It is a welding method that uses arc heat generated between a tungsten electrode and the workpiece to melt the base metal and filler wire (if a filler wire is used) under the protection of an inert gas.
During welding, the shielding gas is continuously ejected from the nozzle of the welding gun, forming a gas protective layer around the arc to isolate the air to prevent its harmful effects on the tungsten electrode, molten pool and adjacent heat-affected zones, thereby obtaining high-quality welds.