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Study on weld seam surface deposits of CuSi3 CMT brazing

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Abstract

CuSi3 CMT brazing is an advanced welding technology widely used in automotive industry. But dark deposits defect was found on the weld seam surface. SEM and EDS analyses were operated in this paper and this surface was found to contain three areas: area A with silicates thin film and Cu, area B with MnO·SiO2 silicates, and area C with CuO. And thus the formation mechanism of surface deposits, which was mainly attributed to the generation and uneven distribution of large amount of dark CuO, was proposed. Based on the mechanism of the deposit formation, four methods were processed to suppress the surface dark deposits. Ar + 2%O2 would prevent the generation of dark deposits because of enhanced cathode crushing effect. Besides, delay gas protection time, keep torch travel angle positive, and maintain a low heat input would be benefit for suppressing dark deposits on the weld seam surface.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, People’s Republic of China

    Gang Mou, Xueming Hua, Dongsheng Wu & Yuelong Zhang

  2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, 800 Dongchuan Road, Shanghai, 200240, People’s Republic of China

    Gang Mou, Xueming Hua, Dongsheng Wu & Yuelong Zhang

  3. Shanghai Tractor & Internal Combustion Engine Co., LTD, 217 Guoding Road, Shanghai, 200433, People’s Republic of China

    Daming Wang & Weidong Chu

Authors
  1. Gang Mou
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  2. Xueming Hua
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  3. Dongsheng Wu
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  4. Yuelong Zhang
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  5. Daming Wang
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  6. Weidong Chu
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Correspondence to Xueming Hua.

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Mou, G., Hua, X., Wu, D. et al. Study on weld seam surface deposits of CuSi3 CMT brazing. Int J Adv Manuf Technol 92, 2735–2742 (2017). https://doi.org/10.1007/s00170-017-0349-3

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  • DOI: https://doi.org/10.1007/s00170-017-0349-3

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