粉末熔池耦合活性TIG焊接方法

doi:10.11896/j.issn.1005-023X.2017.022.014

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Abstract The present work aims to develop and display a novel activating welding method, i.e. powder pool coupled activating TIG (PPCA-TIG) welding. Amongst the PPCA-TIG welding, tungsten was protected by inner layer argon or other inert gas, meanwhile the activated flux powder mixing protective gas was transported into the outer layer of arc-molten pool area by the automatic powder feeding device to realize the aim of increasing the depth of penetration, improving the welding efficiency and welding mechanization and automatization. Based on the SUS304 stainless steel, the conventional DC TIG welding and SiO2 activated flux of DC PPCA-TIG welding were performed, and then the effect of SiO2 flux on the arc morphology, weld appearance of welding process, microstructure and the mechanical properties were studied. The results show that SiO2 can constrict the arc plasma, change the weld pool fluid flow mode and augment the depth of weld penetration to 3 times more than that of the conventional TIG welding, and the welding efficiency is obviously improved. The microstructure of the weld is mainly consist of austenite and ferrite, the ferrite morphology is mainly skeleton. Weld tensile strength is slightly lower than that of the base metal, while compared with the conventional TIG welding, it improves the yield strength slightly, and the lower temperature impact toughness of the weld is 96.8% of TIG weld, which shows favorable mechanical properties. At the same time, the PPCA-TIG method can effectively avoid the pollution on the tungsten electrode from the activated flux powder.

Key words： SiO2 powder pool coupled activating TIG welding arc appearance of weld microstructure mechanical property

Published: 08 May 2018

CLC number:

TG444

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	Articles by authors
	HUANG Yong
	ZHAO Wenqiang
	ZHANG Liyao

Cite this article:

HUANG Yong,ZHAO Wenqiang,ZHANG Liyao. Powder Pool Coupled Activating TIG Welding Method[J]. Materials Reports, 2017, 31(22): 70-74.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.022.014 OR http://www.mater-rep.com/EN/Y2017/V31/I22/70

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