| 摘要 |
PURPOSE:To economize the amt. of the costly nonmagnetic material to be used in the production of a vessel provided with branch pipes for preventing inductive generation of heat by fitting and welding a bored nonmagnetic circular disk into each f the hole of the magnetic plate of the prescribed size in the parts for forming the branch pipes and bending the disk to a cylindrical shape then extrusion-molding the branch pipe part to the outside after butt welding. CONSTITUTION:The nonmagnetic bored metallic circular disk 2 is fitted and welded into the hole 1a of the magnetic metallic late 1 of the prescribed size in the part corresponding the part where the branch pipe is to be formed. The plate 1 is then bent and the end edge thereof is butt-welded to form a cylindrical shape B. The branch pipe part 3a is extrusion-molded toward the outside. Since the branch pipe part 3a is of the nonmagnetic material, the generation of heat of the vessel 3 by the inductive current generated by a built-in conductor 4 is prevented and the amt. of the costly nonmagnetic material such as stainless steel plate to be used is economized. The disk 2 may be bored after the fitting and welding.
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