• CN：11-2187/TH
• ISSN：0577-6686

›› 2012, Vol. 48 ›› Issue (8): 74-78.

• 论文 •

### 带状电极窄间隙MAG焊

1. 哈尔滨工业大学先进焊接与连接国家重点实验室
• 发布日期:2012-04-20

### Narrow Gap MAG Welding Using Strip Electrode

ZHENG Senmu;GAO Hongming;ZHOU Lin

1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology
• Published:2012-04-20

Abstract: In order to solve the common problem of incomplete fusion at the groove walls and roots in narrow gap welding, based on the consideration that make the welding arc heat the groove wall directly by decreasing the groove width, a new narrow gap metal active-gas(MAG) welding method is brought forward, in which the strip electrode with rectangular cross section is used as the consumable electrode instead of the traditional round wire. The welding arc automatically swings at the electrode end and so it can improve the heating effect on the groove walls and roots. Special welding torch is designed. And the effect of groove width, arc voltage and strip electrode feed speed on the arc behavior is studied. It is found that the groove width has the decisive effect on the weaving arc phenomenon while the arc voltage and strip electrode feed speed have not much effect. The welding arc does not swing when the groove width is too big, and it can climb up along the groove wall without restriction when the arc voltage is too high. The strip electrode feed speed is mainly set to match the arc voltage and make sure the welding process stable. The results indicate that the steady weaving arc can be realized by adjusting the groove width, arc voltage and strip electrode feed speed properly, and the narrow gap weld with groove walls and roots of well fusion is obtained.