Transition of Nitrogen During the GMAW Process and Its Effects on the Microstructure and Properties of Stainless Steel Joint
CHENG Shanghua1, LI Fangliang1, ZHANG Yiqi1, WU Shaojie1,2, CHENG Fangjie1,2,*
1 School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China 2 Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China
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.
程尚华, 李方亮, 张一琪, 武少杰, 程方杰. 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[J]. 材料导报, 2023, 37(18): 22020113-6.
CHENG Shanghua, LI Fangliang, ZHANG Yiqi, WU Shaojie, CHENG Fangjie. Transition of Nitrogen During the GMAW Process and Its Effects on the Microstructure and Properties of Stainless Steel Joint. Materials Reports, 2023, 37(18): 22020113-6.
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2023, Vol. 37 
