镁/钢填镍夹层激光-电弧复合对接熔化焊特性
Study on butt fusion welding characteristics of AZ31B magnesium alloy to steel by hybrid laser-TIG welding with Ni interlayer
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摘要: 利用激光-电弧(TIG)复合热源的能量密度梯度分布特征,通过添加镍箔夹层,开展了AZ31B镁合金与Q235钢对接熔化焊研究.采用电子万能拉伸试验机、扫描电镜、X射线衍射仪等手段分析了焊接接头的组织特征以及力学性能.结果表明,采用该方法能够实现镁/钢异质金属对接焊接成形,界面结合良好,接头钢侧形成了由Fe,Ni,Al元素构成的明显过渡区,焊缝主要由α-Mg和大量弥散分布的白色AlNi相颗粒组成.焊接接头断裂在钢侧界面附近,断口形貌呈现准解理断裂特征,接头平均抗拉强度为232 MPa,可达镁合金母材的90%.Abstract: Investigations on butt fusion welding characteristics of AZ31B magnesium alloy to steel with Ni interlayer were carried out by utilizing the gradient energy density characteristic of laser-TIG heat source. The tensile strength and microstructure of the joint were examined by electronic tension machine, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results indicated that magnesium alloy can be butt joined to steel by hybrid laser-TIG welding with good Mg/Fe interface by using Ni foil as the interlayer. At the same time, tests showed that a distinct transition zone consisting of Fe, Ni and Al elements forms at the steel side nearby the interface; the microstructure of the joint is mainly composed of α-Mg and a large number of small white particles which are mainly composed of AlNi phase and dispersively distributed. The joint fractures nearby the Mg/Fe interface and the fracture surface shows a typical quasi-cleavage crack. The average of the joint tensile strength is 232 MPa, which is about 90% of the magnesium base metal.
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Keywords:
- hybrid laser-TIG heat source /
- butt joint /
- magnesium alloy /
- steel /
- Ni interlayer
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期刊类型引用(2)
1. 刘浩东，戴京涛. 激光焊接技术的应用研究进展与分析. 电焊机. 2022(01): 95-102 . 
百度学术
2. 张成，卢庆华，蔡遵武，张培磊. 高频微振辅助工艺对激光焊接接头组织性能的影响. 焊接学报. 2019(02): 86-90+165 . 本站查看
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