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argon purging in carbon steel welding

thread178-40795

argon purging in carbon steel welding

argon purging in carbon steel welding

(OP)
FOR WELDING CARBON STEEL 106-GR B OR  ASTM333 -GR 6 PIPE WELDING ,IS IT REALLY NECESSARY TO KEEP BACKING GAS   ( PURGING GAS) WHILE USING  INSERT AT ROOT?. IF NOT USED ,WHAT WAY IT WILL AFFECT THE WELD AND ITS LIFE IN CRITICLE NUCLEAR GRADE WELDS. WELDING IS DONE BY TIG PROCESS WITH C.S COSUMABLE INSERTS.  LOOKING REPLY FROM AN EXPERT.

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