| 摘要 |
PURPOSE:To prevent a joining part from becoming narrow and improve the mechanical strength of the part wherein the joining part is formed by coaxially welding two rod-like parts such as a thermal fuse of a fusable alloy and a lead wire. CONSTITUTION:In the case of coaxially welding a joining end part 1a of a fusable alloy 1 of a thermal fuse with a joining end part 2a of a lead wire 2, the joining end part 1a of the fusable alloy 1 is previously bent almost rectangularly. The bent end part 1b which is so formed as to become a thicker end of the fusable alloy is partly melted by laser light 4 and welded to the joining end part 2a of the lead wire 2, so that the joining part 3 of the fusable alloy 1 and the lead wire 2 are formed to be thick and thus the mechanical strength of the joining part 3 is stabilized constantly. Besides the method to thicken the joining end part 1a of the fusable alloy 1, it is possible to employ a method to form the joining end part 1a as a spherical end part by heating the part to melt and then solidifying the molten end. |
