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Arc profile characteristics of Al alloy in double-pulsed GMAW

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Abstract

In order to study arc profile variation process with double-pulsed gas metal arc welding of aluminum alloy, a synchronous acquisition system and an analysis system have been established to acquire and analyze electrical signals and instantaneous images of arc profile. The results show that in double-pulse mode, the arc profile is matched with high-frequency pulse and thermal pulse. The droplet transfer mode always accompanies with high-frequency pulse cycle “one drop per pulse.” The arc profile variation and droplet transfer in thermal base are lower than that in thermal peak. The serial-type arc is easier to occur in thermal base stage. High current density distribution at the top and bottom of traveling droplet leads to dazzling region. The variation of wire extension is influenced by thermal pulse frequency. The variance of arc size in thermal base is higher than in thermal peak, which leads arc force to vary with thermal pulse frequency. The variation of the droplet transfer and arc force in double pulse can improve the weld pool mobility.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai, China

    Anhua Liu, Xinhua Tang & Fenggui Lu

Authors
  1. Anhua Liu
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  2. Xinhua Tang
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  3. Fenggui Lu
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Correspondence to Anhua Liu.

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Liu, A., Tang, X. & Lu, F. Arc profile characteristics of Al alloy in double-pulsed GMAW. Int J Adv Manuf Technol 65, 1–7 (2013). https://doi.org/10.1007/s00170-012-4141-0

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  • DOI: https://doi.org/10.1007/s00170-012-4141-0

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