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DUE TO PRO CITY OR LACK OF FUSION
low amperage or no grinding
first rooted in the joint then weld joint
When you not treed the welding spot with head treetment after it wash weld it will start to cold crac on that spot ofter weeks
Defect often occurs after welding is crack in Carbon Steels Cr-Mo (P3-P4 and P5 Numbers for Asme Code)
THE WELD DEFECT OFTENLY OCCURS IS COLD CRACK.
hydrogen cracks
this problem can solved by using low Hydrogen electrods
Cold cracks..