A Study on Friction Stir Multi Spot Welding Techniques to Join Commercial Pure Aluminum and Mild Steel Sheets
A Study on Friction Stir Multi Spot Welding Techniques to Join Commercial Pure Aluminum and Mild Steel Sheets
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DOI：
10.1007/s12666-016-0916-6
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发表时间：
2017-07
影响因子：
1.6
通讯作者：
M. Swamy;S. Muthukumaran;K. Kiran
中科院分区：
文献类型：
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作者：
M. Swamy;S. Muthukumaran;K. Kiran
为显著提高铝板与低碳钢异种钢接头的抗剪强度，研究了四种搅拌摩擦多点焊工艺。在所有这些方法中，最初都是通过摩擦堆焊在钢侧沉积增塑铝层。随后，对沉积的铝材进行摩擦成形。修整后，用不同的刀具配置进行点焊。分别以900、1120、1400和1800转/分的刀具转速分析了它们对焊核的影响。对所制得的焊缝进行了不同的力学和金相分析。在坡口低碳钢表面涂上铝层，然后用凹头焊接工具进行搅拌摩擦多点焊，形成了焊缝。这些焊缝具有良好的冶金结合特性和较高的剪切强度，在1120转/分的转速下，其剪切强度是传统搅拌摩擦点焊的两倍多。
To achieve significant improvement in the shear strength of dissimilar joints between aluminum and mild steel sheets, four methods of friction stir multi-spot welding processes, were investigated. Initially, in all these methods, plasticized aluminum layer was deposited on the steel side by friction surfacing. Subsequently, the deposited aluminum was compacted by friction forming. After dressing, spot welding with different tool configurations was performed. Tool rotational speeds of 900, 1120, 1400 and 1800 rpm were used to analyze their effects on the weld nugget. Different mechanical and metallurgical characterizations were done on the welds thus made. The process with aluminum layer on grooved mild steel followed by friction stir multi-spot welding using concave tipped welding tool resulted in welds. These welds had better metallurgical bonding characteristics and higher shear strength, which at a rotational speed of 1120 rpm was more than twice that of the welds made with conventional friction stir spot welding.