激光-电弧复合焊焊缝合金元素分布的研究

发布时间：2018-01-29 09:53

本文关键词： 激光光学激光-电弧复合焊合金元素分布焊接速度焊接方向熔池流动　出处：《中国激光》2015年04期 　论文类型：期刊论文

【摘要】：激光-电弧复合焊接相对激光焊接的优势之一是通过焊接材料的添加,调整焊缝的合金元素成分,改善焊缝组织与性能。焊接材料添加的合金元素在焊缝中的均匀分布是体现激光-电弧复合焊接这一优势的关键。然而,对于窄而深的激光-电弧复合焊焊缝,实现合金元素的均匀分布是非常困难的。研究了焊接工艺参数对CO2激光-熔化极气体保护(GMA)复合焊焊缝合金元素分布的影响规律,并讨论了熔池流动行为与合金元素分布均匀性的关系。结果表明,随着焊接速度的减小,CO2激光-GMA复合焊焊缝合金元素的分布趋向于均匀分布;随着坡口间隙的增大,焊缝合金元素均匀程度越高。焊接方向为激光在前时,激光-电弧复合焊接熔池流动为内向流动时(即熔池表面从熔池后部向小孔流动,并且小孔后沿液体向下流动),焊缝合金元素分布较均匀,其均匀性高于焊接方向为电弧在前时的情况。焊接方向对焊缝合金元素分布的影响规律主要取决于电弧拖拽力和熔滴对熔池冲击力的方向。当焊接方向为激光在前时,电弧拖拽力和熔滴对熔池冲击力指向小孔方向,促进了熔池内向流动。
[Abstract]:One of the advantages of laser-arc composite welding compared with laser welding is to adjust the alloy element composition of weld through the addition of welding material. The uniform distribution of alloy elements added in welding material is the key to reflect the advantages of laser-arc composite welding. However, for narrow and deep laser-arc composite welding weld. It is very difficult to realize the uniform distribution of alloy elements. The effect of welding parameters on the distribution of alloy elements in CO2 laser-gas shielded gas composite weld is studied. The relationship between the flow behavior of molten pool and the distribution uniformity of alloy elements is discussed. The results show that the distribution of alloy elements tends to be uniform with the decrease of welding speed. With the increase of groove gap, the uniformity of weld alloy elements is higher. When the welding direction is laser, the flow of laser arc composite welding pool is introverted (that is, the surface of weld pool flows from the back of pool to the hole in the weld pool). And after the small hole flowing down the liquid, the distribution of alloy elements in the weld is more uniform. The effect of welding direction on the distribution of alloy elements is mainly determined by the direction of arc drag force and the direction of droplet force on the molten pool. When the welding direction is laser, the effect of welding direction on the distribution of alloy elements in the weld is mainly determined by the direction in which the arc drag force and the droplet impact force on the weld pool. Front time. The arc drag force and droplet impact force on the molten pool point to the orifice and promote the inward flow of the molten pool.
【作者单位】：中国钢研科技集团有限公司新冶高科技集团有限公司;物质·材料研究机构;中国钢研科技集团有限公司;
【分类号】：TG456
【正文快照】： 2物质·材料研究机构,筑波305-00473中国钢研科技集团有限公司,北京1000811引言激光-电弧复合焊接是将激光和电弧这两种不同的热源耦合共同作用于同一区域。相对单一热源,激光-电弧复合焊接具有熔深大、速度快、稳定性高、允许的坡口间隙大以及气孔少等特点,在汽车、造船、桥

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