问题 多项选择题

激光焊接过程中,下列说法哪些正确()

A.被焊物件必须是属于含低碳成分钴铬合金的铸件

B.后一个焊点须覆盖前一个焊点的70%

C.激光熔化焊时,焊件不需留间隙

D.被焊接件的焊接区应呈点对点的接触关系

E.焊接时要用惰性气体保护

答案

参考答案:A, B, E

填空题
填空题

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