Effects of helium gas flow rate on arc shape, molten pool behavior and penetration in aluminum alloy DCEN TIG welding

被引：15
作者：
Chen, Chen [1 ]
Wei, Xinqian [1 ]
Zhao, Yong [1 ]
Yan, Keng [1 ,2 ]
Jia, Zhanjun [2 ]
He, Yuxiang [2 ]
机构：
[1] Jiangsu Univ Sci & Technol, Prov Key Lab Adv Welding Technol, 2 Mengxi Rd, Zhenjiang 212003, Jiangsu, Peoples R China
[2] Air Prod & Chem Shanghai Gases Co, 1166 Fulian Rd, Shanghai 201907, Peoples R China
来源：
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2018年 / 255卷
关键词：
DCEN TIG; Helium flow rate; Arc shape; Oxidation film; SHIELDING GASES;
D O I：
10.1016/j.jmatprotec.2017.12.029
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Helium arc bead-on-plate welding has been observed using a high-speed video filming technique. Both the arc diameter and area were compressed with increasing gas flow. The arc compressed in the radial direction and stretched in length, causing a voltage increase. There was no negative-pole atomization in the direct current electrode negative (DCEN) mode, and the helium arc could tear the oxidation film on Al alloys. The broken oxidation film flowed on the molten pool wider various forces. The arc shear force and arc pressure component are the dominant driving forces to tear the oxidation film. The ability of the helium arc to tear the oxidation film decreased with gas flow rate varying from 5 to 20 L/min. Penetration increased with gas flow because of the compression effect.
引用
收藏
页码：696 / 702
页数：7
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