Friction stir spot welding (FSSW) is an appropriate process to join materials that are difficult to weld using fusion welding, such as copper. In this paper, an experimental study to weld lap joint of pure copper plates having a dimensions of 100 x 30 x 2 mm is performed, successful spot weld is obtained at tool rotational speed of 1200 rpm, feed rate of 20 mm/min for dwell time of 2 seconds. The tool used in the FSSW has a threaded pin of 5 mm diameter, length of 3.7 mm, and a scrolled shoulder of 11.52 mm diameter. Tensile test and microhardness were performed for the joint and it showed reasonable weld strength. In addition, a numerical model was developed, and the estimated temperatures as well as weld macrostructure matched very well with experimental results.
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机译：搅拌摩擦点焊（FSSW）是将诸如聚铜之类的难于使用熔焊进行焊接的材料连接起来的合适工艺。本文进行了一个实验研究，以焊接尺寸为100 x 30 x 2 mm的纯铜板搭接接头，在工具转速为1200 rpm，进给速度为20 mm / min的情况下，成功进行了点焊时间为2秒。 FSSW中使用的工具具有5毫米直径的螺纹销，3.7毫米长度和11.52毫米直径的滚动肩。对接头进行了拉伸试验和显微硬度测试，结果显示出合理的焊接强度。另外，建立了一个数值模型，估计的温度以及焊缝的宏观结构与实验结果非常吻合。
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