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搅拌摩擦焊(FSW)技术在高熔点材料上的应用仍然受限于搅拌头的寿命。在FSW过程中,搅拌针承受着巨大的剪切力和摩擦磨损。预热工件可以软化被焊材料,是提高搅拌头寿命的方法之一。本文进行了Q235钢氧-丙烷火焰辅助加热FSW数值模拟与试验研究;建立了火焰与搅拌头双热源模型,利用有限元分析软件ANSYS模拟分析了FSW过程中的热量传递过程,获得了被焊材料的温度场分布;进行了Q235钢的火焰辅助加热FSW试验研究,分析了对接焊时FSW接头热影响区、热力影响区和焊核区的显微结构,以及焊缝的显微硬度。计算得到的热影响区形状和尺寸与试验测量的结果基本吻合。
Friction stir welding (FSW) technology in the high melting point material application is still limited by the life of the mixing head. In the FSW process, the needles are subject to significant shear and frictional wear. Preheating the workpiece can soften the material to be welded, which is one of the ways to improve the life of the mixing head. In this paper, the numerical simulation and experimental research on FSW of Q235 steel oxy-propane flame-assisted heating was carried out. The dual heat source model of flame and stirrer was established. The heat transfer process in FSW was simulated and analyzed by finite element analysis software ANSYS, The temperature field distribution of Q235 steel was studied. The FSW experimental study of flame-assisted heating of Q235 steel was carried out. The microstructure of heat-affected zone, heat-affected zone and weld nugget in butt-welded steel and the microhardness of weld were analyzed. The calculated shape and size of the heat-affected zone are in good agreement with the experimental results.