关军印,姜佳成,牟晨飞,刘耀东

• 1:长春工业大学教育部先进结构材料重点实验室

摘要(Abstract)：

通过冷金属过渡技术(CMT)以ER4043 Al-Si焊丝为填充材料,在极小电流下对5052铝合金和CR340LA镀锌钢板进行搭接熔-钎焊,并在母材表面涂覆改性钎剂,改善钎料在母材表面的润湿及铺展性。采用扫描电镜(SEM)、X射线能谱分析(EDS)、X射线衍射分析(XRD)和万能拉伸试验机对熔-钎焊接头进行显微结构和力学性能研究。结果表明:焊接接头界面层的物相从近钢侧到近铝侧依次为Fe(Al,Si)、η-Fe_2(Al,Si)_5、θ-Fe(Al,Si)_3相,Si元素能够与Fe/Al元素发生反应,形成复杂的三元化合物,从而延缓Fe-Al金属间化合物层的生长。当金属间化合物层的厚度为2～5μm时,接头具有较好的力学性能,断裂发生在铝合金热影响区,焊接电流为35 A时,接头抗拉强度可达189 MPa。

关键词(KeyWords)： 熔钎焊;热输入;润湿性;金属间化合物

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 关军印,姜佳成,牟晨飞,刘耀东

DOI: 10.13289/j.issn.1009-6264.2019-0160

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