分别采用Al-Mg-Zr和Al-Mg-Zr-Sc合金焊丝为填充材料,对2 mm厚的Al-Mg-Sc合金薄板进行惰性气体保护焊接,然后对两种焊接接头的显微组织和力学性能进行对比研究.结果表明:采用两种焊丝焊接的Al-Mg-Sc合金薄板的焊接接头强度系数均大于0.9.但采用Al-Mg-Zr-Sc合金焊丝为填充材料时,焊缝晶粒组织明显细化,熔合区形成的细小等轴晶层提高了基材与焊缝填充材料的结合力,焊接接头的屈服强度比采用Al-Mg-Zr合金焊丝为填充材料时提高了100 MPa,显著提高了Al-Mg-Sc合金焊接构件的许用强度,因此焊接Al-Mg-Sc板材更宜采用Al-Mg-Sc-Zr焊丝.
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