穿孔法等离子弧立焊焊缝成形机理初探  

A Preliminary Study on the Weld Formation of Keyhole Plasma Welding in Vertical Position

作　　者：雷玉成[1] 郑惠锦[1] 

机构地区：[1]江苏理工大学材料科学与工程学院,江苏镇江212013

出　　处：《江苏理工大学学报（自然科学版）》2000年第1期61-64,共4页Journal of Jiangsu University of Science and Technology(Natural Science)

摘　　要：通过对立焊穿孔熔池的受力状态的分析,初步揭示了穿孔法等离子弧立焊焊缝成形机理,从而发现焊接工艺参数对焊缝成形影响的规律,为进一步研究穿孔法等离子弧立焊焊缝成形机理奠定了基础理论分析和试验结果均表明,穿孔能否连续稳定存在是焊缝成形的前提,而穿孔熔池液面金属的受力及流动则对焊缝正反面的成形起着重要作用在此基础上指出,焊接电流和离子气流量过大时会因穿孔熔池下半部的收缩能力小于上半部的扩张速度而形成切割,反之。Force analyses of the liquid metal in the keyhole pool are made to formulate preliminarily the weld formation in keyhole mode vertical position PAW and to find out the influences of welding conditions on the weld formation.The findings lay a foundation for further research into the weld formation in the keyhole mode vertical position PAW . The test result shows that whether the keyhole exists steadily in a workpiece throughout the welding is the premise of the weld formation and that the flow of the liquid metal in the keyhole pool is of great importance to the weld formation on the front and the back sides . Based on the above analysis and experimental result,it is pointed out that if the welding current and the flow rate of plasma are too high, a cutting is formed, for the contraction rate of the lower pool is lower than the expansion rate of the upper pool,but if the welding current and the flow rate are too low, the workpiece is not penetrated . The high crowns and widths of the weld on the front and back sides are controlled by adjusting the current and the distance from the nozzle to the workpiece.

关 键 词：等离子弧焊 立焊 穿孔熔池 穿孔法 焊缝 

分 类 号：TG456.2[金属学及工艺—焊接]