MIG welding (inert gas metal arc welding)
In addition to MIG welding torch instead of tungsten electrode with metal wires. Other and TIG welding. Therefore, the welding wire is melted by the arc, and is sent into the welding area. Power driven roller according to the required welding wire into the welding torch from the reel.
Heat source is also a DC arc, but the polarity and TIG welding used in the opposite. The protective gas used is also different, in order to improve the stability of the arc by adding l% oxygen into the argon gas.
There are also some differences in the basic process, for example, spray, pulse injection, ball and short circuit transfer.
TIG welding – working principle
TIG welding heat source for the DC arc welding, the working voltage of 10 to 15 volts, but the current up to 300, the workpiece as the cathode, torch in the tungsten electrode as the anode.
Inert gas is generally argon.
Inert gas through the torch into the arc and weld pool formed around the shield. In order to increase the heat input, 5% hydrogen is generally added to the argon. However, when the ferritic stainless steel is welded, it is unable to add hydrogen in argon. The gas consumption is about 8 to 10 liters per minute. In the process of welding except from blowing the inert gas welding torch, gas from the best weld protection for blowing weld.
If required, the same welding wire, which is filled in the weld pool of the weld pool, can be filled with the same material as the welded austenitic material.
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Post time: May-29-2017