低电流TIG电弧辅助高速MIG咬边缺陷抑制机理及工艺优化
发布时间：2019-04-21 14:44
【摘要】：传统的M1G焊接工艺以其高适应性、易于实现自动化等优点,在制造业中得到广泛应用。在实际焊接过程中,当MIG焊焊接速度超过某一临界值时,焊缝成形中通常会伴有咬边缺陷,成为制约该工艺在高速焊中的主要障碍。改善高速MIG焊缝成形,研究高速MIG咬边缺陷的抑制机理,对MIG在高速焊中的应用具有重要的研究意义和理论价值。设计、制作了TIG-MIG复合焊接双焊枪加持装置,优化了电参数采集设备。完成了温度场、流场和熔滴过渡检测等实验平台的搭建,用以获取高速TIG-MIG复合焊焊接过程中熔池传质,传热以及受力变化。初步工艺实验表明低电流TIG辅助电弧可有效抑制高速MIG焊咬边缺陷。开展了温度参量和咬边缺陷的相关性研究,得出熔池边缘温度梯度是影响咬边缺陷的重要温度参量。低电流TIG辅助电弧可以有效降低高速MIG焊熔池前部边缘部位的温度梯度。此外,熔池流动行为也表明低电流TIG辅助电弧可以促进液态金属向焊缝边缘的铺展和填充,达到降低熔池边缘温度梯度的目的。研究焊接过程中受力变化对焊缝成形的影响,对比各种作用力对咬边缺陷的影响力度。结果表明低电流TIG电弧辅助高速焊中,熔滴冲击力和电弧力是影响咬边缺陷的主要作用力,重力及表面张力等作用力为次要作用力。通过低电流TIG电弧的辅助可以有效减小电弧力的作用,从而减轻甚至抑制高速MIG焊接过程中咬边缺陷的产生。在理论研究的基础上,针对性的开展工艺实验。获取复合焊中各焊接工艺参数对咬边缺陷的影响,制定出工艺优化的简易方案,以减少工艺优化数量。优化后的复合焊参数能完全抑制高速焊咬边缺陷的产生。
[Abstract]:The traditional M1G welding process has been widely used in manufacturing because of its high adaptability and easy automation. In the actual welding process, when the welding speed of the MIG welding exceeds a certain critical value, there are usually bite defects in the weld forming, which becomes the main obstacle in the process of high-speed welding. It is of great significance and theoretical value to improve the weld forming of high-speed MIG and to study the suppression mechanism of high-speed MIG bite defects. It is of great significance and theoretical value for the application of MIG in high-speed welding. The double welding torch holding device of TIG-MIG composite welding is designed and manufactured, and the electric parameter collecting equipment is optimized. The experimental platform of temperature field, flow field and droplet transfer detection was built to obtain the mass transfer, heat transfer and stress change of molten pool during the welding process of high-speed TIG-MIG composite welding. The preliminary experimental results show that the low current TIG auxiliary arc can effectively restrain the edge-biting defects of high-speed MIG welding. The correlation between temperature parameters and edge-biting defects is studied. It is concluded that the temperature gradient on the edge of molten pool is an important temperature parameter that affects the edge-biting defects. The low current TIG auxiliary arc can effectively reduce the temperature gradient at the front edge of the high-speed MIG welding pool. In addition, the flow behavior of the weld pool shows that the low current TIG auxiliary arc can promote the spreading and filling of liquid metal to the weld edge, so as to reduce the temperature gradient of the weld pool edge. The influence of force change on weld forming during welding is studied, and the influence of various forces on bite defect is compared. The results show that droplet impact force and arc force are the main forces affecting edge-biting defects in low-current TIG arc-assisted high-speed welding, while gravity and surface tension are secondary forces. With the aid of low current TIG arc, the effect of arc force can be reduced effectively, so as to reduce or even restrain the formation of edge-biting defects in high-speed MIG welding. On the basis of theoretical research, the process experiment is carried out. In order to reduce the number of process optimization, the influence of welding process parameters on edge-cutting defects in composite welding was obtained, and the simple scheme of process optimization was worked out in order to reduce the number of process optimization. The optimized composite welding parameters can completely inhibit the formation of edge-biting defects in high-speed welding.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG444.74
本文编号：2462303
[Abstract]:The traditional M1G welding process has been widely used in manufacturing because of its high adaptability and easy automation. In the actual welding process, when the welding speed of the MIG welding exceeds a certain critical value, there are usually bite defects in the weld forming, which becomes the main obstacle in the process of high-speed welding. It is of great significance and theoretical value to improve the weld forming of high-speed MIG and to study the suppression mechanism of high-speed MIG bite defects. It is of great significance and theoretical value for the application of MIG in high-speed welding. The double welding torch holding device of TIG-MIG composite welding is designed and manufactured, and the electric parameter collecting equipment is optimized. The experimental platform of temperature field, flow field and droplet transfer detection was built to obtain the mass transfer, heat transfer and stress change of molten pool during the welding process of high-speed TIG-MIG composite welding. The preliminary experimental results show that the low current TIG auxiliary arc can effectively restrain the edge-biting defects of high-speed MIG welding. The correlation between temperature parameters and edge-biting defects is studied. It is concluded that the temperature gradient on the edge of molten pool is an important temperature parameter that affects the edge-biting defects. The low current TIG auxiliary arc can effectively reduce the temperature gradient at the front edge of the high-speed MIG welding pool. In addition, the flow behavior of the weld pool shows that the low current TIG auxiliary arc can promote the spreading and filling of liquid metal to the weld edge, so as to reduce the temperature gradient of the weld pool edge. The influence of force change on weld forming during welding is studied, and the influence of various forces on bite defect is compared. The results show that droplet impact force and arc force are the main forces affecting edge-biting defects in low-current TIG arc-assisted high-speed welding, while gravity and surface tension are secondary forces. With the aid of low current TIG arc, the effect of arc force can be reduced effectively, so as to reduce or even restrain the formation of edge-biting defects in high-speed MIG welding. On the basis of theoretical research, the process experiment is carried out. In order to reduce the number of process optimization, the influence of welding process parameters on edge-cutting defects in composite welding was obtained, and the simple scheme of process optimization was worked out in order to reduce the number of process optimization. The optimized composite welding parameters can completely inhibit the formation of edge-biting defects in high-speed welding.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG444.74
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