| 摘要 |
PURPOSE:To form stable weld zones in the stage of spot-welding metallic members having a large difference in melting temp. by providing a hole in one of the metallic members and press contacting a specific base piece in said hole then pressing the another metallic member thereto and spot welding the member. CONSTITUTION:In the stage of spot-welding a heating wire 6 consisting of a nichrome wire in a thermal overload relay to a connecting plate 8 made of brass, there is a large difference in melting temp. between both metallic members; therefore, the formation of spot-weld zones of good quality is difficult. In such a case, a through-hole 81 of a circular or square shape is pierced in the plate 8, and a base piece 10 of phosphor bronze or Fe-Ni ''Imvar '' which can be welded to both of nichrome wires and brass is inserted therein, and is pressurized from both sides E to expand the parts extruded to the outside from the hole 81. The wire 6 as heating metal is pressed to this part, whereby the wire is spot- welded. The stable weld zones of both metallic members are formed with the piece 10. |
