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以AZ31镁合金搅拌摩擦点焊过程为研究对象,分析搅拌头不同转速和压入速度对焊接过程温度场的影响。温度场的测定主要通过将两个热电偶分别植入搅拌头轴肩和搅拌针顶端。试验结果表明,搅拌头最高温度随转速增加而增加,所得最高温度为532.530℃,最高升温速率为93.974℃/s,而同一转速下压入速度对最高温度没有影响。使用Deform-3D软件进行AZ31镁合金搅拌摩擦点焊过程温度场数值模拟分析,数值模拟结果与试验结果基本吻合。
Taking the friction stir spot welding process of AZ31 magnesium alloy as the research object, the influence of different rotation speed and pressing speed of the mixing head on the temperature field of the welding process was analyzed. The measurement of the temperature field is mainly by implanting two thermocouples into the shaft shoulder of the mixing head and the top of the stirring pin respectively. The experimental results show that the maximum temperature of the mixing head increases with the increase of rotating speed, the maximum temperature is 532.530 ℃ and the highest temperature rising rate is 93.974 ℃ / s, while the same speed does not affect the maximum temperature. Deform-3D software was used to simulate the temperature field of the friction stir spot welding process of AZ31 magnesium alloy. The numerical simulation results are in good agreement with the experimental results.