Effect of welding process on the porosity sensitivity of aluminum alloy pulse MIG horizontal welding

LIU Weiliang; JIANG Tao; RAO Yuzhong; LAI Shaobo; YAN Dejun; YANG Chunli

Views : 0 下载量: 915 CSCD: 2

PDF
Export
Share
Collection
Album

Effect of welding process on the porosity sensitivity of aluminum alloy pulse MIG horizontal welding
Vol. 49, Issue 6, Pages: 15-19(2019)
Published：2019
DOI：
稿件说明：

移动端阅览

DOI：

LIU Weiliang, JIANG Tao, RAO Yuzhong, et al. Effect of welding process on the porosity sensitivity of aluminum alloy pulse MIG horizontal welding[J]. Eletric Welding Machine2019, 49(6): 15-19. DOI：

摘要

在铝合金大型结构件焊接中横焊的难度最大

如何减少焊缝气孔缺陷是当前的研究热点之一。以1561铝合金板脉冲MIG横焊为研究对象

通过X射线探伤和显微组织观察系统分析了不同焊接工艺参数对气孔敏感性的影响

结果显示:氦气与氩气混合气在一定比例范围内

焊前高温预热、电弧上倾

均有利于熔池气体逸出;电弧电压和焊接速度的增加有利于减少焊缝大气孔

而随着焊接电流增加

焊缝大气孔数量增加。该研究可为铝合金横焊工艺的优化提供试验依据。

Abstract

In the welding of aluminum alloy large-scale structural parts

horizontal welding is the most difficult technique. How to reduce weld porosity defects is one of the current research hotspots. The pulsed MIG horizontal welding of 1561 aluminum alloy plates was studied in this paper. The effect of different welding process parameters on the porosity sensitivity was analyzed by X-ray detection and microstructure observation. The results show that the mixture ratio of helium and argon gas in a certain range

the high temperature preheating

the arc tilted upwards

are conducive to gas escaping from molten pool. With the increase of arc voltage and welding speed

it is beneficial to reduce the number of large pores in the weld

and with the increase of welding current

the number of large pores increases. This study can provide a solid experimental basis for the optimization of the welding process for horizontal welding of aluminum alloy.