1.5GPa급 자동차용 고강도강의 레이저 용접부 특성평가
Evaluation of Laser Welding Characteristics of 1.5GPa Grade Ultra High Strength Steel for Automotive Application
- 한국레이저가공학회
- 한국레이저가공학회지
- 한국레이저가공학회지 제13권 제4호
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2010.121 - 6 (6 pages)
- 136

Recently the use of ultra high strength steels (UHSS) in structural and safety component is rapidly increasing in the automotive industry. For example, 1.5GPa grade hot stamping with die-quenching of boron steel 22MnB5 could apply crash-resistant parts such as bumpers and pillars. The development of laser welding process of hot stamping steels, fundamental bead-on-plate welding and lap joint welding test were carried out using 3kW Nd:YAG laser. Local hardening & HAZ softening occurred in hot stamping steel as a result of metallurgical change caused by the welding heat input in the Nd:YAG laser welding process. The size of soft zones in the hot stamping steel was related to the welding heat input, being smaller at high speeds which generated a smaller heat input. Also in the case of lap joint design structure, same welded characteristics were shown. The HAZ softening degree was controlled to ensure the joint strength.
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