• Title/Summary/Keyword: Fillet Welding

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A Study on Processing of Monolithic Rack Housing for Modular Steering Gear[I] - The Weldability of SAE1020 Steel by Different Heat Sources - (Steering Gear 모듈화를 위한 일체형 Rack Housing의 공정에 관한 연구[I] - 열원에 따른 SAE1020강의 용접특성 -)

  • Kim, Jong-Do;Lee, Chang-Je
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.2
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    • pp.306-314
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    • 2008
  • General metal welding occurs distortion. Also, reducing distortion is required much cost. Therefore, the purpose of this study is optimization of welding conditions to reduce distortion in welding of monolithic rack housing for modular steering gear. Firstly, heat source for welding was chosen arc and laser. Secondly, it investigated optimizing welding conditions in bead welding by arc and laser heat source, and welding conditions in fillet welding was optimized with welding shapes. Finally, it was measured temperature distribution of welds by infrared camera and angle distortion in fillet welding. As a result, laser welding was superior to arc welding on distortion.

Characteristics of Fatigue Failure according to Thickness of Material and Number of Passes in Cruciform Fillet Weld Zone (십자형 필릿 용접부에서 재료 두께 및 용접 층수에 따른 피로파괴 특성)

  • Lee, Yong-Bok
    • Journal of Welding and Joining
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    • v.28 no.6
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    • pp.45-50
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    • 2010
  • Most of joining processes for machine and steel structure are performed by butt and fillet welding. The mechanical properties and fatigue strength of their welding zone can be effected largely by the differential of generated heat and changes of grain size according to thickness of material and number of passes in welding process. In this study, it was investigated about characteristics of fatigue failure according to thickness of material and number of passes in cruciform fillet weld zone as the basic study for safe and economic design of welding structures. Fracture modes in cruciform fillet weld zone are classified into toe failure and root failure according to non-penetrated depth. It can be accomplished economic design of welding structures considering fatigue strength when the penetrated depth in fillet weld zone is controled properly.

A Study on Current Decision of Lead-Trailing Torch for Defect Improvement in Tandem Fillet Welding (탄뎀 필릿용접 불량개선을 위한 선후행 토치의 전류 결정에 관한 연구)

  • 박대규;양종수;조상명
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.92-94
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    • 2004
  • 선박 건조 시 적용되는 여러 가지 용접기법 중 가장 많이 적용되는 기법 중 하나가 FCA용접 (Flux Cored Arc Welding)이다. 일반적으로 100% $CO_2$ 가스를 사용하고, 플럭스 코어드 와이어를 사용하여 자동 또는 반자동 용접에 적용한다. (중략)

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