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焊接性不好，易产生裂纹，焊前应预热。
Welding is not good, easy to crack, preheating before welding shall be.
youdao
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手工组焊，手工作业，焊接工整性欠佳，易产生气孔夹渣。
Manual welding, manual welding, neat poor, easy to produce porosity slag.
youdao
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手工组焊，手工作业，焊接工整性欠佳，易产生气孔夹渣。
Manual welding, manual welding, neat poor, easy to produce porosity slag.
youdao