MIG surfacing welding process of 304L stainless steel on T2 pure copper with addition of active flux

WANG Shuo; LIANG Jianming; GAO Xiaogang; ZHAO Fang; LI Shuangqing

doi:10.13264/j.cnki.ysjskx.2023.04.010

Volume 14 Issue 4

Aug. 2023

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Nonferrous Metals Science and Engineering > 2023 > 14(4): 518-526. > DOI: 10.13264/j.cnki.ysjskx.2023.04.010

WANG Shuo, LIANG Jianming, GAO Xiaogang, ZHAO Fang, LI Shuangqing. MIG surfacing welding process of 304L stainless steel on T2 pure copper with addition of active flux[J]. Nonferrous Metals Science and Engineering, 2023, 14(4): 518-526. DOI: 10.13264/j.cnki.ysjskx.2023.04.010

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MIG surfacing welding process of 304L stainless steel on T2 pure copper with addition of active flux

School of Mechanical Engineering, Hebei University of Architecture, Zhangjiakou 075000, Hebei, China

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Received Date: November 07, 2022
Revised Date: February 11, 2023
Available Online: August 23, 2023

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Abstract

In this paper, MIG welding was used to weld overlay 304L stainless steel on a T2 pure copper substrate. Based on analyzing the influence of welding current and preheating temperature on the formation of the surfacing layer, the active flux transition layer was further added. By analyzing the effect of the active flux on the surfacing layer and the copper-stainless steel interface, it can be found that the active flux can effectively increase the penetration depth and improve the bonding of the copper-stainless steel interface. It should be noted that Cr₂O₃ can not only produce arc shrinkage but also change the flow pattern of the molten pool, which is better than that of NaF. After the addition of Cr₂O₃ active flux, Cu-Fe in the copper-stainless steel bonding interface forms a miscible zone, a spherical Fe-rich phase on the copper side, and a granular Cu-rich phase on the stainless steel side. The diffusion of Cu-Fe can improve the bonding interface and avoid forming copper-infiltrated cracks. The optimized process is as follows: adding Cr₂O₃ active flux, the preheating temperature at 400 ℃, and welding current 320 A.
- T2 pure copper,
- 304L stainless steel,
- surfacing welding of dissimilar metals,
- active flux

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