| 摘要 |
PURPOSE:To prevent deterioration in the weld zone of an electric welded steel pipe owing to the accumulation of the nonmetallic inclusions in said zone and to prevent groove corrosion in welding of said pipe by plating one side end or both side ends of a blank material for the pipe with >=1 kind among elements which are resistant to groove corrosion and have a specific thickness then subjecting the material to resistance welding. CONSTITUTION:One side end face or both side end faces of a blank material to be welded for an electric welded steel pipe are plated with >=1 kinds among elements which are resistant to groove corrosion and have about 0.01-100mu thickness, i.e., copper, nickel, chromium, cobalt, tin, etc. to prevent deterioration in strength. The material is subjected to electric resistance welding via such plating layer. The selective corrosiveness in the weld zone owing to the accumulation of the nonmetallic inclusions such as MnS or Mn-O-S is prevented by the corrosion resistance of such elements, by which the groove corrosion in the weld zone is prevented. |
