外加磁场对不锈钢激光热丝焊的影响
发布时间：2018-10-30 06:54
【摘要】：为了研究磁场对激光焊接的影响,采用在工件旁放置永磁铁、提供横向或者纵向常磁场对不锈钢进行激光电流热丝焊接的方法,结合焊缝横截面形状以及焊缝组织等,对不同磁场下激光热丝焊接头进行了分析。结果表明,磁场的加入对焊接过程和接头形状有显著影响,适当的磁感应强度能稳定激光热丝焊接过程,磁感应强度过大则易造成大量飞溅;焊缝接头的形状随磁场的方向、极性以及磁感应强度的变化而改变;横向磁场的加入能提高激光热丝焊接效率;磁场还能减少焊缝柱状树枝晶区域,促进胞状晶的形成,提高焊缝的显微硬度值。外加磁场在焊接熔池中产生了安培力,安培力是搅拌熔池的主要作用力,从而改变液态金属流动,造成激光热丝焊接头形状和组织的改变。
[Abstract]:In order to study the effect of magnetic field on laser welding, the method of laser current hot wire welding of stainless steel with transverse or longitudinal constant magnetic field is adopted, which combines the shape of cross section of weld and the structure of weld, etc. The laser hot wire welding joints under different magnetic fields are analyzed. The results show that the addition of magnetic field has a significant effect on the welding process and the shape of the joint. The proper magnetic induction intensity can stabilize the welding process of laser hot wire, and if the magnetic induction intensity is too large, a large amount of spatter can be easily caused. The shape of weld joint changes with the direction of magnetic field, polarity and magnetic induction intensity, the addition of transverse magnetic field can improve the efficiency of laser hot wire welding. The magnetic field can also reduce the dendritic region of weld, promote the formation of cellular crystal, and improve the microhardness of weld. The applied magnetic field produces ampere force in the welding pool, which is the main force of stirring pool, which changes the flow of liquid metal and changes the shape and structure of laser hot wire welding joint.
【作者单位】： 华中科技大学材料科学与工程学院;
【基金】：国家九七三重点基础研究发展计划资助项目(2014CB046703)
【分类号】：TG456.7
本文编号：2299263
[Abstract]:In order to study the effect of magnetic field on laser welding, the method of laser current hot wire welding of stainless steel with transverse or longitudinal constant magnetic field is adopted, which combines the shape of cross section of weld and the structure of weld, etc. The laser hot wire welding joints under different magnetic fields are analyzed. The results show that the addition of magnetic field has a significant effect on the welding process and the shape of the joint. The proper magnetic induction intensity can stabilize the welding process of laser hot wire, and if the magnetic induction intensity is too large, a large amount of spatter can be easily caused. The shape of weld joint changes with the direction of magnetic field, polarity and magnetic induction intensity, the addition of transverse magnetic field can improve the efficiency of laser hot wire welding. The magnetic field can also reduce the dendritic region of weld, promote the formation of cellular crystal, and improve the microhardness of weld. The applied magnetic field produces ampere force in the welding pool, which is the main force of stirring pool, which changes the flow of liquid metal and changes the shape and structure of laser hot wire welding joint.
【作者单位】： 华中科技大学材料科学与工程学院;
【基金】：国家九七三重点基础研究发展计划资助项目(2014CB046703)
【分类号】：TG456.7
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