WELDING METHOD FOR SEALING HOLE

摘要

PURPOSE:To weld surely the hole punched in a coated pipe with an easy operation and to simplify a positioning mechanism, by fitting and detaining a filler wedge having the wall thickness roughly equal to the wall thickness of said pipe and moving circularly an electrode along the edge of the punched hole thereby welding the hole. CONSTITUTION:A gap cup 4 of a rotary type is mounted via a clamp housing 5 in the punched hole 6 part of a coated pipe 1 by a remote operation and an electrode 3 is positioned on the edge of the hole 6. An electrode 3 is moved circumferentially along the contact part between the hole 6 edge of the pipe 1 and a filler wedge 2 and electric current is conducted thereto to weld the hole. The electrode makes one turn around the edge of the hole 6 to weld the hole; thereafter the electrode is further rotated half intermittently to weld the hole. The bending of the pipe is thus prevented without deformation such as ruggedness.