激光辅助加热搅拌摩擦焊3维流场数值模拟

为了优化激光辅助加热搅拌摩擦焊接工艺、为焊接实验提供理论依据,采用数值模拟的方法,进行了Q235钢激光辅助加热搅拌摩擦焊3维流场模拟仿真。模拟分析了粘塑性材料的流动行为及热量传递过程,获得了被焊材料的流动场及温度场分布。结果表明,在焊接过程中,被焊材料主要是由后退侧向前进侧流动;激光功率为800W、焊接速率为23.5mm/min、转速由750r/min增加至1180r/min的过程中,被焊材料的流动性变好,最高温度升高,但未超过钢的熔点,与实际实验过程中钢未熔化一致。激光作为辅助热源,为焊接过程提供热量输入,可改善焊接材料的流动性。

Numerical simulation of 3-D flow field on laser-assisted heating friction stir welding of steel

In order to optimize welding parameters of laser-heated friction stir welding ( FSW ) and provide theoretical foundation for experiments , numerical simulation was adopted and simulation of 3-D flow field of Q235 steel laser-assisted heating FSW was conducted .Flow behavior and heat transfer process ofviscoplastic material were analyzed .Flow field and temperature distribution of welding material were acquired .The results show that the welding material is transported mainly along the retreating side.When rotational speed increases from 750r/min to 1180r/min under the condition of 800W laser power and 23.5mm/min welding speed , the material flow gets stronger .The highest temperature rises , but not more than the melting point of steel .The phenomenon is consistent with that the steel does not melt in the process of the actual experiment .Laser, as an auxiliary heat source,can provide heat input during the welding process and can improve mobility of welding materials .