| 摘要 |
PURPOSE:To achieve a high efficiency in pipe making welding and the higher stiffness of the welding metal by executing a submerged welding from the outer face, inner face or both faces of a pipe after performing a plasma welding of the seam part of a U-formed, O-formed two phase stainless steel pipe stock. CONSTITUTION:A two phase stainless steel pipe is made with a UOE method. In case of the thin thickness pipe stock subjected to a U-formed, then O-formed, a welding metal 2 is formed so as to cover a welding metal 1 by executing a submerged welding from the outer face of the pipe, after forming the welding metal 1 with the plasma welding of the Y groove of the seam part. In case of a thick pipe stock, a welding metal 4 is formed by executing the submerged welding respectively from the outer face and inner face of the pipe after forming a welding metal 3 with the plasma welding of the X groove of the seam part from the outer face. In this way the higher efficiency in the pipe making welding of the two phase stainless steel and the higher stiffness of the welding metal can simultaneously be achieved.
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