PURPOSE: To provide a welding method of a seam weld zone in the case of production of a clad stainless steel pipe by a method, such as UOE, from a clad steel consisting of an austenitic stainless steel having excellent corrosion resistance as a base metal on an inside surface side and a low alloy steel having excellent strength as a base metal on an outside surface side.
CONSTITUTION: The seam part 3 of the clad steel is subjected to edge prepn. of a double Vee shape of which the depth of the groove 4 on the inside surface side is 80 to 130% of the thickness of a cladding metal 2, the angle is 60 to 80°, the route thickness is 3 to 5mm and the angle on the outside surface side is 60 to 80°. The groove part 5 on the outside surface side is subjected to tack welding with a welding wire for the low alloy steel; thereafter, the inside and outside surfaces are subjected to submerged arc welding with one pass. As a result, the inside surface weld zone free from the defects occurring in component dilution is obtd.
TAMEHIRO HIROSHI
HORII YUKIHIKO
MIYAKE SATOYUKI
