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Dissimilar metal joining of aluminium to zinc-coated steel by ultrasonic plus resistance spot welding – microstructure and mechanical properties
Science and Technology of Welding and Joining ( IF 3.3 ) Pub Date : 2019-09-18 , DOI: 10.1080/13621718.2019.1667051
Ying Lu 1 , Dean D. Sage 1 , Carolin Fink 1 , Wei Zhang 1
Affiliation  

Vehicle body structures are increasingly utilising multi-materials designs with advanced high strength steels (AHSS) and aluminium alloys. A robust process for joining aluminium alloys to AHSS based on resistance spot welding (RSW) is essential to widespread application of such bi-metallic structures in fuel-efficient vehicles. In this study, ultrasonic plus RSW was applied to join AA6022 to Zn-coated dual-phase steel DP980. During solid-state ultrasonic spot welding, an interface structure comprising multilayer, Al–Zn and Zn–Fe intermetallics formed due to alloying of aluminium with steel coating. Such structure was subsequently melted into the aluminium nugget, and new Al–Fe intermetallics formed during RSW. Ultrasonic plus resistance spot-welded joints had superior fracture energy than direct resistance spot-welded joints.

中文翻译:

通过超声波加电阻点焊将铝与镀锌钢连接起来的异种金属——微观结构和机械性能

车身结构越来越多地采用采用高级高强度钢 (AHSS) 和铝合金的多材料设计。基于电阻点焊 (RSW) 将铝合金连接到 AHSS 的稳健工艺对于这种双金属结构在节油车辆中的广泛应用至关重要。在这项研究中,应用超声波加 RSW 将 AA6022 连接到镀锌双相钢 DP980。在固态超声波点焊过程中,由于铝与钢涂层的合金化,形成了包含多层、Al-Zn 和 Zn-Fe 金属间化合物的界面结构。这种结构随后被熔化到铝块中,并且在 RSW 过程中形成了新的 Al-Fe 金属间化合物。超声波加电阻点焊接头的断裂能量优于直接电阻点焊接头。
更新日期:2019-09-18
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