厚壁件留间隙双面埋弧焊工艺控制可视化系统研究

Research on Visual Control System of Double-sided Gap Submerged Arc Welding for Thick-walled Workpiece

针对厚壁件留间隙双面埋弧焊优化设计模型的建立需要,依据相关文献资料在焊接规范数据库中增加了焊丝伸出长度项、将每个厚度尺寸段内的焊接速度由常量改为变量、拓宽了焊接电流的阈值范围;通过修改原有的焊丝熔化速度、熔透率、焊道面积的经验公式并引入比线能量,使约束条件更具物理意义,且使作为目标函数的焊缝稀释率真正成为所有设计变量的函数,由此重构出优化模型。在此基础上开发的可视化系统已在工程实际中得到应用,降低了对厚壁件留间隙双面埋弧焊焊接质量的预测难度,提高了评价效率。

This paper is aimed at the establishment of the design optimization model for double-sided gap submerged arc welding in thick-walled workpiece.According to relevant literature,the extension length of welding wire is added in the welding specification database;the welding speed in thick-walled workpiece of each thickness section is changed from the constant to the variable;and the threshold range of welding current is widened.By modifying the original empirical formula of welding wire melting speed,penetrating proportion,weld seem area and introducing Linear Power Input(LPI),the constraint condition has more physical significance,and the welding seam dilution rate as the objective function truly becomes the function of all design variables,thus the optimization model is reconstructed.On this basis,the development of the visualization system has already been applied in engineering practice,which reduces the difficulty of predicting the quality of double-sided gap arc welding of thick-walled workpiece,and improves the evaluation efficiency.