Effect of Welding Wire Composition on Welding Usability of High Nitrogen Steel Using Cold Metal Transfer Plus Pulse Welding Method

doi:10.12382/bgxb.2021.0799

Abstract

Abstract:

To improve the welding quality of high nitrogen steel and optimize the welding process, the welding stability caused by nitrogen and manganese content was studied. Welding experiments were performed using five different welding wires made of high nitrogen steel by the Cold Metal Transfer plus Pulse welding method to investigate the effect of welding wire composition on electrical signal, droplet transfer, spatter rate. The results showed that: the increase of nitrogen content caused the fluctuation and discrete distribution of electrical signals, while the change in manganese content had less effect on electrical signals: the effect of nitrogen content in welding wire on welding stability using the CMT+P welding method was greater than that of manganese content; the mode of droplet transfer changed from one droplet per pulse to one droplet per multiple pulses as the nitrogen content increased, and the melting droplets becames irregular in shape and larger, meaning the welding usability of wires was worse; when the nitrogen and manganese contents in the welding wire was small, namely 0.42% and 7.19%, respectively, the welding process stability was better; the rapid escape of nitrogen and the evaporation of manganese caused high-nitrogen steel droplets to explode violently, producing a large amount of spatter; the welding spatter rate increased with the increasing nitrogen and manganese contents.

Key words: high nitrogen steel, droplet transfer, spatter, cold metal transfer plus pulse

ZHANG Jian, LI Tao, LIN Hongxia, YANG Dongqing, FANG Hui, FAN Jikang, WANG Kehong. Effect of Welding Wire Composition on Welding Usability of High Nitrogen Steel Using Cold Metal Transfer Plus Pulse Welding Method[J]. Acta Armamentarii, 2023, 44(3): 792-798.

Figures/Tables 6

References 20

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焊丝序号	C	Mn	Cr	Ni	Mo	N	P	S	Fe
焊丝①	0.031	7.19	21.49	5.32	2.36	0.42	0.01	0.008	Bal.
焊丝②	0.027	6.85	21.03	5.37	2.38	0.58	0.011	0.010	Bal.
焊丝③	0.066	16.79	21.66	2.18	1.25	0.57	0.018	0.008	Bal.
焊丝④	0.071	16.95	21.59	2.32	1.21	0.79	0.019	0.008	Bal.
焊丝⑤	0.028	17.86	22.7	2.08	1.19	0.99	0.015	0.01	Bal.

焊丝序号	C	Mn	Cr	Ni	Mo	N	P	S	Fe
焊丝①	0.031	7.19	21.49	5.32	2.36	0.42	0.01	0.008	Bal.
焊丝②	0.027	6.85	21.03	5.37	2.38	0.58	0.011	0.010	Bal.
焊丝③	0.066	16.79	21.66	2.18	1.25	0.57	0.018	0.008	Bal.
焊丝④	0.071	16.95	21.59	2.32	1.21	0.79	0.019	0.008	Bal.
焊丝⑤	0.028	17.86	22.7	2.08	1.19	0.99	0.015	0.01	Bal.