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Journal of KWJS 2007;25(2):55-61.
Published online May 17, 2007.
590㎫급 고강도강 플래시버트 용접이음부의 기계적특성
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Mechanical Properties of the Flash Butt Welded Joint of 590MPa High Strength Steel
Boyoung Jeong, In-Su Woo, Jeong-Kil Kim, Jong-Bong Lee
Abstract
  Flash butt weldability of 590㎫ dual phase steel is carried out under micro metallographical examination and macro mechanical property tests. The objective of present study is to investigate the cause that brings on bond line fracture, and is to improve mechanical properties of the flash butt welded joint. The joint of flash butt welding has a superior tensile property, but has bad formability due to oxide formed at bond interface. The HAZ softening in the weld joint does not show. It was found that mechanical properties were increased with optimizing welding parameters and making application of oil dripping and post-weld heat treatment.
Key Words: Flash butt welding, DP steel, Tensile strength, Erichsen test
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