MICROSTRUCTURES AND PROPERTIES OF PULSED MIG ARC BRAZED-FUSION WELDED JOINT OF Al ALLOY AND GALVANIZED STEEL
MICROSTRUCTURES AND PROPERTIES OF PULSED MIG ARC BRAZED-FUSION WELDED JOINT OF Al ALLOY AND GALVANIZED STEEL
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铝合金与镀锌钢脉冲MIG电弧钎焊熔焊接头的组织与性能
DOI：
10.3724/sp.j.1037.2012.00046
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发表时间：
2012-08
期刊：
影响因子：
--
通讯作者：
Wang Shujun
中科院分区：
文献类型：
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作者：
Qin Guoliang;Su Yuhu;Wang Shujun
由于铝合金与钢在物理化学性能和力学性能上存在较大差异，如何实现高质量、高效率的连接一直是焊接技术研究的难点之一。根据铝合金与钢熔点的不同，在MIG焊的基础上发展了铝合金与钢的钎焊-熔焊工艺。在脉冲MIG焊-熔焊过程中，熔化的钎料与铝合金母材形成熔焊接头，并与未熔化的钢板形成钎焊接头，有效地防止了金属间化合物的形成。利用数字化脉冲MIG焊机，以ER4043为焊料，实现了6013-T4铝合金与镀锌钢板的钎焊-熔焊，研究了焊接线能量对接头组织和性能的影响。结果表明，在钎焊-熔焊接头的焊趾处存在一个由锌铝共晶、富铝�固溶体和Fe_3Al组成的富锌区。钎焊界面上的Fe-Al IMCs层厚度为1.05~4.50微米，并且随着焊接热输入的增加而变厚。Fe-Al IMC呈锯齿状或舌状向焊缝方向生长，主要为FeAl2、Fe2Al5和Fe4Al13。具有焊接热输入
Because there are great differences in physicochemical properties and mechanical properties between Al alloy and steel, their joining with high quality and high efficiency is one of difficult problems in study of welding technology. According to their difference in melting point, the brazing-fusion welding technology of Al alloy to steel was developed based on MIG welding. In pulsed MIG arc brazing-fusion welding process, the molten filler metal and Al alloy base metal will form the fusion welded joint, and will form the brazed joint together with unmelted steel plate, which can efficiently prevent the intermetallic compounds (IMCs) from the formation. With the digital pulsed MIG arc welding machine, the brazing-fusion welding of 6013-T4 Al alloy plate to galvanized steel plate was realized with the filler metal of ER4043, and the effect of welding heat input on microstructures and properties of the joint was studied. The results showed that there is a zinc-rich zone in the weld toe of fusion weld in the brazed-fusion welded joint, which is composed of Zn-Al eutectic, Al-rich � solid solutions and Fe3Al. Fe-Al IMCs layer on the brazed interface is 1.05—4.50 µm in thickness and become thicker with the welding heat input being increased. Fe-Al IMCs with sawtooth or tongue shape grow towards the weld, which mainly includes FeAl2, Fe2Al5 and Fe4Al13. With the welding heat input