6472| 17
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兩根45鋼焊接后發(fā)黑出現(xiàn)金黃色 |
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點(diǎn)評(píng)
很有可能是,。
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點(diǎn)評(píng)
不知道焊接數(shù)據(jù)沒(méi)法說(shuō),。說(shuō)不定焊條含有其他金屬。
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