Journal
JOURNAL OF MANUFACTURING PROCESSES
Volume 80, Issue -, Pages 581-590Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2022.05.030
Keywords
Welding method; Surface root sagging; Excitation frequency; Phase ratio; Grain refinement
Categories
Funding
- National Natural Science Foun-dation of China [52175299, U1960102]
- Shandong Provincial Natural Science Foundation [ZR2020KE010]
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This paper proposes a novel arc oscillation welding method to weld thin-walled duplex stainless steel. By oscillating the arc along the welding direction with the aid of an alternating magnetic field, the surface sagging of the weld during the conventional GTAW process is alleviated, the heat affected zone becomes narrower, and the gamma/alpha phase ratio in the weld zone can be regulated. Additionally, the arc oscillation manipulates the texture characteristics of weld microstructure and improves the strength and plasticity of the weld synergistically.
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, gamma/alpha (austenite/ferrite) phase ratio in the weld zone are regulated. At an excitation frequency of 10 Hz, the weld with gamma/alpha 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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