| 摘要 |
Each side (11a) of a thin metal plate (11) is held with clamps (27). The thin metal plate (11) is pulled by the clamps (27), and tensile force by each clamp is adjusted to hold the thin metal plate (11) in a flat state without distortion and sagging. At the same time, a frame (13) is elastically deformed by pressing it, with a force having the same magnitude as the tensile force applied to the thin metal plate (11), in the opposite direction to the tensile force. Then, in this state the thin metal plate (11) is welded and fixed to the frame (13) by a spot welding machine (40). When the thin metal plate (11) and the frame (13) are freed, tensile force remaining in the plate (11) is cancelled by restoring force of the frame (13). This prevents the frame (13) from being pulled by the thin metal plate (11) and deformed, and the frame (13) can hold the thin metal plate (11) in a state without distortion and sagging.
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