Application of Laser-Arc Hybrid Welding to Thick Steel Plates for Bridge Structures

For examining the application of laser-arc hybrid welding to the fabrication of steel bridge members, a series of experiment and investigation was conducted. The weld cracking tests were performed on the steels for bridge structural members with 15 mm in thick for identifying the welding condition by which one-pass full-penetration welding without cracks and defects was achieved. Then, butt welded joints were fabricated by the specified condition. The same dimensional butt joints were fabricated by the conventional arc welding. The welding time, heat input, welding distortion and residual stress generated by the hybrid welding were compared with those by the conventional arc welding for clarifying the effectiveness of hybrid welding. The welding time of hybrid welding was shorter than that of arc welding by 98% due to the high-speed welding. Because of the low heat input and the one-pass full-penetration welding, the angular distortion by hybrid welding was reduced by 96% compared to that by arc welding. The field of tensile stress in the longitudinal direction by hybrid welding was reduced by 25% to 50% compared to that of arc welding. Finally, it was confirmed that the hybrid welded joints did not include the weld defects and satisfied the basic mechanical performances.


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  • Accession Number: 01892585
  • Record Type: Publication
  • ISBN: 9789811595288
  • Files: TRIS
  • Created Date: Sep 11 2023 11:39AM