• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2008, Vol. 44 ›› Issue (2): 230-233.

• 论文 • 上一篇    下一篇

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基于能量最小原理的熔化极气体保护电弧焊短路过渡液桥形状动态模型

何建萍;吴毅雄;焦馥杰   

  1. 上海工程技术大学材料工程学院;上海交通大学焊接工程研究所
  • 发布日期:2008-02-15

Dynamic Model of Liquid Bridge Profile in Gas Metal Arc Welding by Principle of Minimizing Energy

HE Jianping;WU Yixiong;JIAO Fujie   

  1. College of Material Engineering, Shanghai University of Engineering Science Institute of Welding Engineering, Shanghai Jiaotong University
  • Published:2008-02-15

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摘要： 基于能量最小原理，建立了熔化极气体保护电弧焊(Gas metal arc welding，GMAW)短路过渡液桥形状动态变化的模型。在一定的假设条件下，以电磁力、表面张力、重力共同作用下的液桥某体积元上具有的能量(势能)最小，建立GMAW短路过渡液桥形状动态变化的模型，结合焊接回路的动态模型，对液桥形状动态变化进行仿真计算，并在此基础上进一步进行模型的试验验证和模型的误差分析。研究结果表明，建立的GMAW短路过渡液桥形状模型所描述的液桥轮廓动态变化趋势与试验结果比较吻合，实际焊接过程中的液桥形状还受到磁偏吹、焊接运动过程、熔池作用、保护气体流动等的影响，这些影响是造成液桥形状模型误差的主要因素。

关键词: 动态模型, 短路过渡液桥, 能量最小原理, 熔化极气体保护电弧焊

Abstract: Dynamic liquid bridge profile in gas metal arc welding (GMAW) based on principle of minimizing energy is modeled. The energy of a small unit in liquid bridge tends to be minimizing under surface tension force, electromagnetic force, and gravity force, so a dynamic liquid bridge profile in GMAW is modeled. Dynamic behavior of liquid bridge is analyzed when dynamic model of GMAW welding circuit in short circuit period is associated. Deviations of model are discussed. The results show that the dynamic development tendency of liguid bridge profile is about the same in simulation and experiment. The factors that cause calculation deviations are arc blow, welding movement, welding pool action, shielded gas lugging.

Key words: Dynamic model, Gas metal arc welding(GMAW), Liquid bridge of short circuit transfer, Minimizing energy principle

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