结果表明，清根方式对焊缝冲击韧度有明显影响，用碳弧气刨清根得到的焊缝冲击韧度最好，而用酸性衬垫得到的焊缝冲击韧度最差。
It was found that impact toughness of weld metal was maximum using carbon arc air gouging, and it was minimum using acid backing.
结果表明，清根方式对焊缝冲击韧度有明显影响，用碳弧气刨清根得到的焊缝冲击韧度最好，而用酸性衬垫得到的焊缝冲击韧度最差。
It was found that impact toughness of weld metal was maximum using carbon arc air gouging, and it was minimum using acid backing.
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