材料科学
焊接
熔池
奥氏体
冶金
微观结构
铁氧体(磁铁)
钨极气体保护焊
激发
振荡(细胞信号)
复合材料
磁场
电弧焊
电气工程
量子力学
生物
遗传学
工程类
物理
作者
Fuxiang Li,Yibo Liu,Weipeng Ke,Peng Jin,Haoyu Kong,Mingliang Chen,Qing Sun
标识
DOI:10.1016/j.jmapro.2022.05.030
摘要
In this paper, a novel arc oscillation welding method, namely, the arc oscillation along the welding direction with the aid of alternating magnetic field, is adopted to weld thin-walled 2205 duplex stainless steel in autogenous mode. The oscillating arc can route some effects on the weld forming as well as the microstructure evolution of weld zone, which in turn affects the weld performance. The results show that such arc oscillation can alleviate the surface root sagging of the weld during the conventional GTAW process, and the improvement effect becomes more pronounced with the increase of excitation frequency. Simultaneously, the heat affected zone of the weld with magnetic field at a higher frequency becomes narrower. Based on the reheating effect of arc oscillation on the molten pool, γ/α (austenite/ferrite) phase ratio in the weld zone are regulated. At an excitation frequency of 10 Hz, the weld with γ/α ratio nearly 1:1 is obtained. Meanwhile, arc oscillation can manipulate the texture characteristics of weld microstructure, which follows that the higher the excitation frequency, the lower the texture density. Eventually, the strength and plasticity of the weld are improved synergistically at a higher magnetic field frequency in this work.
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