Microstructure and Mechanical Properties of CO_2 Laser-MAG Hybrid Weld of High Strength Steel : Study on laser-arc hybrid welding of high strength steel (Report 2)

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概要

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• The microstructure and mechanical properties of 600MPa grade high strength steel welds made by CO_2 laser welding and CO_2 laser-MAG hybrid welding have been investigated. The microstructures of weld metals and heat-affected zone (HAZ) were observed by optical microscope and scanning electron microscope (SEM). The distribution of alloying element in weld metal was identified by electron probe microanalysis (EPMA). Microstructure and chemical composition were different between the locations of the hybrid weld metal. There was more ferrite and bainite in the nail head part than nail part (bottom part) in the hybrid weld metal. Tensile tests of the laser welded joints and the hybrid welded joints were performed according to JIS-Z-2201 and JIS-Z-2202. The notch toughness of the weld metals were also measured using half-size Charpy V-notch impact test specimen. The hybrid weld metals showed higher toughness than the laser weld metal at the testing temperature range of-60℃ to +15℃.

• 社団法人溶接学会の論文
• 2006-11-05

著者

• Xu Guojian

  名古屋大学大学院工学研究科

• Liu Zhongjie

  名古屋大学大学院工学研究科

• Kutsuna Muneharu

  名古屋大学大学院工学研究科

関連論文

• Microstructure and Mechanical Properties of CO_2 Laser-MAG Hybrid Weld of High Strength Steel : Study on laser-arc hybrid welding of high strength steel (Report 2)

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