氮在不锈钢GMAW电弧中的过渡规律及对焊缝组织和性能的影响

doi:10.11896/cldb.22020113

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Abstract In this research, the microstructure and properties of the stainless steel joint were accurately controlled by adding certain amount of N₂ to the shielding gas of the gas metal arc welding (GMAW) process. The increase of the N₂ addition, the decrease of the wire feeding speed and the raise of the welding voltage promoted the transition of elemental N from the arc to the deposition metal and resulted in the decrease of the ferrite number (FN) of the joint. It was also proved that the WRC-1992 diagram could not give an accurate prediction of the FN of the multi-pass stainless steel joint that the predicted FN of the deposition metal solidifying as type FA was about 2.7 lower than the measured FN. By adding 10%N₂ to the shielding gas, the multi-pass stainless steel joint remained solidifying as type FA and its FN was successfully controlled to about 3.0, which significantly improved its pitting corrosion resistance. The transition of element N was significantly harder in GMAW process than in gas tungsten arc welding (GTAW) process, thus about 10 times of N₂ should be added to the shielding gas of GMAW process to promote the N transition.

Key words： austenitic stainless steel gas metal arc welding N content of deposited metal pitting resistance

Published: 25 September 2023 Online: 2023-09-18

CLC number:

TG444

Fund:National Natural Science Foundation of China (51775372).

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	Articles by authors
	CHENG Shanghua
	LI Fangliang
	ZHANG Yiqi
	WU Shaojie
	CHENG Fangjie

Cite this article:

CHENG Shanghua,LI Fangliang,ZHANG Yiqi, et al. Transition of Nitrogen During the GMAW Process and Its Effects on the Microstructure and Properties of Stainless Steel Joint[J]. Materials Reports, 2023, 37(18): 22020113-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22020113 OR http://www.mater-rep.com/EN/Y2023/V37/I18/22020113

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