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Effect of phase on the behavior of metal transfer in double-wire pulsed GMAW

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Abstract

High-speed photography was used to record metal transfer during double-wire pulsed gas metal arc welding (GMAW) in the synchronous, alternating and independent phases, while the voltage and current waveforms were recorded simultaneously. According to the relationships between voltage, current, and metal transfer, the effect of phase on the behavior of metal transfer was analyzed. The experimental results demonstrated that metal transfer was all a “one drop per pulse” (ODPP) spray transfer mode in the three phases. ODPP was easier to achieve and metal transfer was more stable in the alternating phase. The deviation distance of droplets in the synchronous phase was larger than that in the alternating and independent phases, and the deviation distance of droplets in the alternating phase was minimum. The surfaces of weld beads acquired showed a desirable weld bead appearance that resembled fish scales. The weld bead in the alternating phase exhibited more obvious fish scales. Phase had little effect on weld width and reinforcement, though it had a significant effect on penetration. Penetration in the alternating phase was significantly deeper than penetration in the synchronous or independent phases, and penetration was minimum in the synchronous phase. The alternating phase facilitated the growth of columnar grains to be inhibited and the directions of ferrites to be disrupted. The columnar grains were discontinuous and the directions of ferrites were more chaotic in the alternating phase when compared with in the synchronous phase. And the anisotropic microstructure in the independent phase was between the synchronous and alternating phases.

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Funding

This work was supported by the National Natural Science Foundation of China (grant no. 51205136), the Competitive Allocation Project Special Fund of Guangdong Province Chinese Academy of Sciences Comprehensive Strategic Cooperation (grant no. 2013B091500082), the Fundamental Research Funds for the Central Universities (Key Program) (grant no. 2015ZZ084), the Science and Technology Planning Project of Guangzhou (grant no. 201604016015), and the China Scholarship Council (grant no. 201606155058).

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China

    Kaiyuan Wu, Tong Yin, Nian Ding, Min Zeng & Zhuoyong Liang

  2. Engineering Research Center for Special Welding Technology and Equipment of Guangdong Province, South China University of Technology, Guangzhou, 510640, China

    Kaiyuan Wu, Tong Yin, Nian Ding, Min Zeng & Zhuoyong Liang

Authors
  1. Kaiyuan Wu
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  2. Tong Yin
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  3. Nian Ding
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  4. Min Zeng
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  5. Zhuoyong Liang
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Correspondence to Kaiyuan Wu.

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Wu, K., Yin, T., Ding, N. et al. Effect of phase on the behavior of metal transfer in double-wire pulsed GMAW. Int J Adv Manuf Technol 97, 3777–3789 (2018). https://doi.org/10.1007/s00170-018-2140-5

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  • DOI: https://doi.org/10.1007/s00170-018-2140-5

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