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high hardness values

high hardness values

high hardness values

(OP)
Dear all,
when we perform SAW welding at 1G rotating position (pipe or rolled plate) with diameter <20" of P No1 material, I receive high hardness values ( > 220 HB). The thing is that we have tried different combinations of wire/flux trademarks, Amperage, Voltage, welding speed etc. The result is always the same: high hardness values. Is there a tip, or I should just forget welding of less than 20" pieces automatically? Another thing is that the same machine gives me good results of hardness tests when welding longitudinal joints...
Thanks for you reply.

teokal  
 

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