Its comprehensive coverage focuses on pressure welding, explosive welding, and friction welding.
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and friction welding
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
And,friction stir welding uses fewer workers at less cost than other methods.
VOA: special.2009.12.30
Friction stir welding is at least twice as strong and 20 times as fast as hand-riveting.
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