レーザ・アークハイブリッド溶接を厚板突合せ継手製造に適用するためのΛ形開先採用に関する一検討

Translated title of the contribution: A study on adopting Λ-shape groove for laser-arc hybrid welding to construct thick plate butt welded joints

Issei Uchino, Takamori Uemura, Koji Gotoh

Research output: Contribution to journalArticlepeer-review

Abstract

Most Japanese shipyards that build general merchant ships use arc welding, but they always have the problem that the accuracy of the hull construction is poor as a result of the thermal deformation caused by arc welding. As one method to overcome this problem, it is expected to adopt laser arc hybrid welding that can suppress the total heat input as a result of heat input concentration, but the initial introduction cost is high and this welding method has a poorer gap tolerance than conventional arc welding. In addition, few experiences to apply laser arc hybrid welding for constructing the joints at the plate thickness level used for hull members of general merchant ships. An improved procedure to fabricate a butt joint with a plate with a thickness of 15 to 20 mm, which is used as a hull member of a general merchant ships is proposed in this study. Proposed procedure is that the Λ-shaped groove with a very small angle and one-pass welding by laser arc hybrid welding with CO2 gas shielded arc welding to satisfy the weld reinforcement on the front side weld bead. The performance of the joint manufactured by using our proposed procedure was confirmed according to the Guidelines for Laser Arc Hybrid Welding by a classification society Nippon Kaiji Kyokai (ClassNK). It is expected to be introduced as an alternative method of plate joint welding for hull members, especially submerged arc welding with large heat input.

Translated title of the contributionA study on adopting Λ-shape groove for laser-arc hybrid welding to construct thick plate butt welded joints
Original languageJapanese
Pages (from-to)403-417
Number of pages15
JournalYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
Volume38
Issue number4
DOIs
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys

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