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Letter 9074
Avoiding blackening during stainless
steel welding
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What is the best way to avoid blackening of stainless steel
surface during welding?
Vish.S
Fortuna Associates - Bangalore, India
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Carbide precipitation occurs when stainless steel is heated to
1600 degrees. That is the separation of the chrome from the ferrite
grains. In the normal welding process the process reverses upon
quenching. If the metal cools too slowly the process will not reverse
and the stainless will turn black. It will also rust. Try a lower
welding temperature or faster travel speed or both.
John Rendleman
- Grand Tower, Illinois, U.S.A.
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