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Why is the weld seam of 304 stainless steel pipe black
The reason why the welds of 304 stainless steel pipes are black is as follows:
The weld surface is oxidized and the surrounding materials are oxidized at high temperatures. The specific reasons for this are as follows: The weld area was not cleaned before welding, and there were impurities such as oil on the stainless steel pipe, causing the weld to turn black; The argon gas protection was insufficient, and the protective gas was not pure, with oxygen and moisture content in the gas.
Moreover, there is a shortage of argon gas supply; long-term welding; excessive current; improper distance between the welding tungsten needle and the workpiece; inappropriate selection of the tungsten needle; high temperature of the molten pool, and no further protection after welding; inadequate protection on the back side of the stainless steel pipe welding (the back side turns black).
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