Working principle of tig welding torch
Tig welding is on the basis of the principle of common electric arc welding, using the argon gas protection for metal welding materials, through high current on the welding backing weld material melt into a liquid pool formation, cause the weld metal and weld material metallurgy combined with a kind of welding technology, due to the continuously in high temperature melting welding on argon gas, make the weld material can not contact with oxygen in the air, to prevent the oxidation of weld material.
The method of selecting the type and polarity of the power supply when manual tig welding torch.
Manual GTAW power supply has DC power supply and AC power supply, dc power supply has DC forward connection method and DC reverse connection method.
Dc positive connection method: weldment positive, tungsten pole negative, so when welding, electronic high speed into the weldment, welding temperature is high, the pool is deep and narrow. The positive ions go to the tungsten electrode, which has low heat loss. This method is suitable for welding heat-resistant steel, alloy steel, stainless steel, copper, titanium, and other metals.
Dc reverses connection method: tig welding parts are connected to the negative pole, tungsten pole is connected to the positive pole, when welding, electronic high-speed to tungsten pole, tungsten pole heat is high, consumption is fast, so it is generally not used. Aluminum, magnesium, and their alloys for welding high melting point oxide films. Ac power supply has both the function of "cathode atomization" and the characteristic of tungsten consumption less than dc reverse connection due to the polar change, so it is suitable for welding aluminum, magnesium, and their alloys.
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