| 摘要 |
PURPOSE:To eliminate man-hour for repair and to reduce material cost by punching a semicircular hole to the central titanium material at the end on the groove side of each aluminum clad steel, pressing a non-weldable round bar and tab pieces thereto and welding the aluminum clad steels. CONSTITUTION:A semicircular hole 7a is punched to the central titanium material part T at the end 4 on a groove side and a stainless steel round bar 9 is butted to the hole 7a and stainless steel tab pieces 10, 11 to the end faces on both sides in butt welding of aluminum clad steels consisting of aluminum A and carbon steel S interposed with the material T. The clad steels are subjected in this state to aluminum welding 5 and steel welding 6. The unwelded contact materials 9, 10, 11 are then removed and a plastic packing material is fed into the central hole 7 to prevent thoroughly the leakage from the weld zone. The defect of deviation in the punched hole from the center thereof after welding in the prior art is thus eliminated and the need for the man-hour and wasteful material cost for repair is eliminated. |
