| 摘要 |
<p>PURPOSE:To prevent the distortion caused at a welding operation from affecting a next welding part during a welding process of a wire material by a method wherein at least two tongue-piece parts extended from one belt part toward the other belt part up to an intermediate part inside a frame are installed inside each frame and a projection of at least one row is installed on the torque-piece parts. CONSTITUTION:A torque-piece part 6 extended from a belt part 2 toward a belt part 2' up to an intermediate part inside a frame and a torque-piece part 7 extended from the belt part 2' toward the belt part 2 up to the intermediate part inside the frame are formed inside the frame. The torque-piece parts 6, 7 are composed of perpendicular parts 6, 9 connected to the belt parts 2, 2' and extended in a direction perpendicular to these parts and are composed of protruding parts 10, 11 installed at tip parts of these parts to be in parallel with the belt parts 2, 2'; two rows of projections 12, 13 are installed at tip parts of the protruding parts. In this case, because two parts are welded at one wire material, a probability that two welded parts become simultaneously defective is reduced to a value by a value raised to the second power of a case where one part is welded; accordingly, the reliability is enhanced remarkably.</p> |
