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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Effect of Al coating conditions on laser weldability of Al coated steel sheet
Jung-Han LEE1, Jong-Do KIM2, Jin-Seok OH2, Seo-Jeong PARK3

1. Graduate School, Korea Marine University, Busan, 606-791, Korea;
2. Division of Marine Engineering System, Korea Marine University, Busan, 606-791, Korea;
3. Welding Research Center, RIST, Pohang, 790-330, Korea

Abstract:Al coated steel sheets with excellent heat resistance, thermal reflection, and corrosion resistance are widely used in various applications. The laser weldability of the Al coated steel sheet for full penetration welding was reported. The phenomenon caused by intermixed aluminum and behavior of aluminum in the weld were investigated. Al coated steel sheets that have various thickness and coating mass were prepared for laser welding. The effects of parameters such as welding conditions and Al coating conditions were investigated. Al content mixed in the weld after laser welding was evaluated, and then a correlation between the mixed Al and mechanical properties was investigated. The results show that the Al-rich zones which have Fe-Al intermetallic compounds are found in the weld. The intermetallic compounds cause the decreased strength of the weld.

 

Key words: Al coating; laser welding; Al coated steel sheet; mechanical properties; intermetallic compound

ISSN 1672-7029
CN 43-1423/U

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