1. Welding seam defects: Welding seam defects are serious and need to be compensated by manual mechanical grinding. The resulting grinding marks will cause the surface to be uneven and affect the appearance. Only pickling and passivating the welds also result in uneven surfaces.2. Scratches are diff

Rebar thread processing①The thread shape, thread pitch, etc. of the large-diameter square tube for processing steel threads must be consistent with the thread shape and pitch of the connecting sleeve and have passed the matching gauge inspection.② When processing steel bar threads, water-soluble cut

Control measures for submerged arc steel pipe welding: Submerged arc steel pipes have become the steel pipes of large-scale oil and gas transportation projects at home and abroad due to their large wall thickness, good material, and stable processing technology. In large-diameter submerged arc steel

(1) Because there are defects such as dirt, scratches, pits, pits or heavy skin on the surface of the blank to be processed, these defects are amplified along with the processing deformation of the blank during the cold forming process, which directly leads to dirt and corrosion of the product. , mo