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通过优化焊接参数,采用搅拌摩擦焊对不可热处理强化A3003-H18合金进行焊接以获得合适的接头。通过改变转速(800~1200 r/min)和行进速度(40~100 mm/min)比(ω/υ),研究热输入对焊接样品显微组织和力学性能的影响。结果表明,随着转速提高,热输入增加,晶粒增长速度大幅增加,而随着行进速度提高,热输入增加,但晶粒增长速度略有增加。与低转速相比,高转速会降低搅拌区的硬度。而不同焊接参数对接头的拉伸强度的影响不明显。在低行进速度时,拉伸样品的断裂位置在前进侧的热影响区(HAZ);而在高行进速度时,断裂位置在后退侧的HAZ/TMAZ界面。
By optimizing the welding parameters, non-heat treatable A3003-H18 alloy was welded by friction stir welding to get the proper joint. The effects of heat input on the microstructure and mechanical properties of the welded samples were studied by changing the speed (800 ~ 1200 r / min) and the traveling speed (40 ~ 100 mm / min) The results show that as the rotational speed increases, the heat input increases and the grain growth rate increases sharply. As the traveling speed increases, the heat input increases, but the grain growth rate increases slightly. Compared with low speed, high speed will reduce the hardness of the stirring zone. However, the influence of different welding parameters on the tensile strength of the joint is not obvious. At low travel speeds, the tensile specimen was fractured at the forward heat-affected zone (HAZ) and at high travel speeds the fractured position was at the receding HAZ / TMAZ interface.