Modelling of bead hump formation in high speed gas metal arc welding
Modelling of bead hump formation in high speed gas metal arc welding
复制标题
高速熔化极气体保护焊中焊道驼峰形成的建模
DOI：
10.1080/13621718.2016.1146427
复制
发表时间：
2016-01-01
影响因子：
3.3
通讯作者：
Du, Baoshuai
中科院分区：
文献类型：
--
作者：
Xu, Guoxiang;Cao, Qingnan;Du, Baoshuai
在不预设任何机理的情况下，建立了一个统一的高速熔化极气体保护焊驼峰焊道形成的三维模型，该模型考虑了固、液、气三相耦合以及电弧等离子体对熔池表面产生的剪切应力的影响。熔池中强烈的反向流动被认为是焊道驼峰形成的主要因素。薄液过渡区的形成及其过早凝固是驼峰焊缝产生的两个条件。在液态金属与工件表面的内接触角较小的情况下，仍会产生焊道驼峰。随着焊接电流的增大，焊缝驼峰现象得到抑制。
Without any presupposed mechanism, a unified three-dimensional model is developed to predict the formation of humping bead in high speed gas metal arc welding, which considers the three phase coupling of solid, liquid and gas and the effect of shear stress exerting on weld pool surface caused by arc plasma. A strong backward fluid flow in weld pool is identified as the major factor for bead hump formation. The generation of thin liquid transition zone and its premature solidification are two conditions responsible for the occurrence of humped weld. In case of low inner contact angle between the liquid metal and workpiece surface, the bead hump is still generated. With increasing welding current, the bead hump can be suppressed.