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Gas metal arc welding of high nitrogen stainless steel with Ar–N2-O2 ternary shielding gas
Defence Technology ( IF 5.1 ) Pub Date : 2020-05-30 , DOI: 10.1016/j.dt.2020.05.021
Zeng Liu , Cheng-lei Fan , Zhu Ming , Chao Chen , Ang Liu , Chun-li Yang , San-bao Lin , Lang-ping Wang

High nitrogen stainless steel with nitrogen content of 0.75% was welded by gas metal arc welding with Ar–N2-O2 ternary shielding gas. The effect of the ternary shielding gas on the retention and improvement of nitrogen content in the weld was identified. Surfacing test was conducted first to compare the ability of O2 and CO2 in prompting nitrogen dissolution. The nitrogen content of the surfacing metal with O2 is slightly higher than CO2. And then Ar–N2-O2 shielding gas was applied to weld high nitrogen stainless steel. After using N2-containing shielding gas, the nitrogen content of the weld was improved by 0.1 wt%. As N2 continued to increase, the increment of nitrogen content was not obvious, but the ferrite decreased from the top to the bottom. When the proportion of N2 reached 20%, a full austenitic weld was obtained and the tensile strength was improved by 8.7%. Combined with the results of surfacing test and welding test, it is concluded that the main effect of N2 is to inhibit the escape of nitrogen and suppress the nitrogen diffusion from bottom to the top in the molten pool.



中文翻译:

高氮不锈钢与Ar–N 2 -O 2三元保护气体的气体保护金属电弧焊

使用Ar–N 2 -O 2三元保护气体通过气体保护金属电弧焊焊接了氮含量为0.75%的高氮不锈钢。确定了三元保护气体对焊缝中氮含量的保持和提高的影响。首先进行堆焊测试,以比较O 2和CO 2促进氮溶解的能力。带O 2的堆焊金属的氮含量略高于CO 2。然后用Ar–N 2 -O 2保护气体焊接高氮不锈钢。使用N 2后在含有保护气体的情况下,焊缝的氮含量提高了0.1重量%。随着N 2继续增加,氮含量的增加不明显,但铁素体从上至下减少。当N 2的比例达到20%时,获得了完全的奥氏体焊缝,并且抗拉强度提高了8.7%。结合堆焊和堆焊试验的结果,可以得出结论,N 2的主要作用是抑制氮的逸出并抑制氮在熔池中从底部扩散到顶部。

更新日期:2020-05-30
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