selecting welding materials
selecting welding materials
选择焊接材料
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The paper introduces welding technology of type ZY6400/12.5/28 hydraulic support, from several respects of selecting materials preheat before welding, welding process and so on.
从焊接材料的选用，焊前预热、焊接过程和焊后热处理的控制几个方面，着重介绍了ZY6400/12.5/28型液压支架的焊接工艺。
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