Role of zinc coating on joint properties in impact spot welded Al 6111 aluminum alloy to galvanized high-strength low-alloy steel

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Advanced Joining Processes Pub Date : 2024-12-18 DOI:10.1016/j.jajp.2024.100276

Angshuman Kapil , Anupam Vivek , Glenn Daehn

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Abstract

This study investigates the influence of Zinc (Zn) coating on the mechanical properties of impact spot welded joints between Aluminum (Al) 6111 alloy and galvanized high-strength low-alloy (HSLA) 340 steel using vaporizing foil actuator welding (VFAW). The Zn coating significantly impacts the weld interface, leading to a heterogeneous structure with regions of retained Zn and trapped jetted material. These regions inhibit direct contact between Al and steel, preventing effective metallurgical bonding and reducing joint strength by 60 % compared to uncoated steel. While the Zn coating impedes bond formation in some areas, near-complete Zn removal in other zones promotes localized ductile tearing and partial bonding, slightly mitigating the overall negative effect. Additionally, a brazing effect outside the weld zone, resulting from the jetting and solidification of Zn and Al-Zn, provides some strength to the joint. The findings highlight the complex role of Zn coating in VFAW, demonstrating that a continuous Zn layer at the weld interface is more detrimental to joint performance than discrete and thin intermetallic compounds.

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镀锌层对Al - 6111铝合金与镀锌高强度低合金钢冲击点焊接头性能的影响

研究了锌（Zn）涂层对铝（Al） 6111合金与镀锌高强度低合金（HSLA） 340钢采用汽化箔促动焊接（VFAW）冲击点焊接头力学性能的影响。Zn涂层对焊缝界面的影响较大，导致焊缝形成非均质结构，并存在Zn残留区和被困射流材料区。这些区域抑制了铝和钢之间的直接接触，阻碍了有效的冶金结合，与未涂覆钢相比，接头强度降低了60%。虽然锌涂层在某些区域阻碍了键的形成，但在其他区域几乎完全去除锌会促进局部韧性撕裂和部分键合，从而略微减轻整体的负面影响。此外，由于Zn和Al-Zn的喷射和凝固，焊接区外的钎焊效应为接头提供了一定的强度。研究结果强调了锌涂层在VFAW中的复杂作用，表明在焊缝界面处连续的锌层比离散的薄金属间化合物对接头性能更有害。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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