welding without preheating
welding without preheating
无预热焊接
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Preheating unit by using Xiapu gas is introduced, the key point that welding casing can be preheated without getting into furnace has been achieved.
介绍了利用霞普气制作的预热装置，实现了压缩机焊接机壳不需进炉就能预热的关键。
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