Problems after pickling of submerged arc welds in 304 stainless steel
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Deities of Haichuan: During my inspections, I found that the 304 base material used for submerged arc welding had a thickness of 12 mm. The welding parameters were as follows: current of 380 A, voltage of 22 V, and welding speed of 420 mm/min for the root pass; current of 390 A, voltage of 35 V, and welding speed of 350 mm/min for the cover pass. The flux used was type 601. After acid washing and passivation, multiple defects were found on the surface of the product (please refer to the images). Upon investigation, it was determined that the welding was done on a newly opened and baked pot. I would like to ask the experts here: what are the causes of this defect, and how can it be avoided? I am extremely grateful.
It should be a problem with the matching of current and voltage