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  • Final version - June 2020

    Rights statement: This is the author’s version of a work that was accepted for publication in Optics & Laser Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Optics & Laser Technology, 133, 2020 DOI: 10.1016/j.optlastec.2020.106530

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Research on weld formation mechanism of laser-MIG arc hybrid welding with butt gap

Research output: Contribution to journalJournal articlepeer-review

Published
  • H. Huang
  • P. Zhang
  • H. Yan
  • Z. Liu
  • Z. Yu
  • D. Wu
  • H. Shi
  • Y. Tian
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Article number106530
<mark>Journal publication date</mark>1/01/2021
<mark>Journal</mark>Optics and Laser Technology
Volume133
Number of pages13
Publication StatusPublished
Early online date19/08/20
<mark>Original language</mark>English

Abstract

At present, there are few researches on laser -MIG arc hybrid welding with a large butt gap. In this paper, laser-MIG arc hybrid welding is used to weld low-alloy high-strength steel with a thickness of 3 mm, and a laser-MIG arc hybrid welding process under large gap conditions is developed. This paper studies the effects of arc voltage, laser-wire distance, and wire feed speed on the gap bridging capability of hybrid welding under different butting gaps. Under the condition of the 1 mm butt gap, the influence mechanism of laser-wire distance on weld the weld formation of hybrid welding is analyzed by combining high-speed photography, welding current and voltage waveform, the macroscopic and microscopic morphology of the weld. The results show that there are optimal process parameter values for the effects of arc voltage and laser-wire distance on the gap bridging capability of hybrid welding. Adjusting the laser-wire distance can optimize the energy distribution of laser on the welding wire and weld pool, thus controlling the arc current, voltage, and droplet transition mode, and finally affecting the weld penetration and forming. When the laser-wire distance is 0 mm, the droplet transition frequency is the fastest, and the droplet transition is a mixture of short circuit transition and liquid bridge transition. At this point, the welding rate is the fastest and the welding process is the most stable. However, by comprehensively integrating factors such as the gap bridging capability and the weld penetration, the optimal processing parameters are obtained when the laser-wire distance is 0.5 mm.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Optics & Laser Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Optics & Laser Technology, 133, 2020 DOI: 10.1016/j.optlastec.2020.106530