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Journal of KWJS 2009;27(2):76-81.
Published online May 18, 2009.
490㎫급 고장력강 탄뎀 가스메탈아크 용접부에 대한 기계적 성질과 미세조직 비교
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Comparison of Mechanical Properties and Microstructural Charateristies of Tandem GMAW Weld Metal in 490㎫ Grade Steel
Hui-Jun Yi, Sung-Soo Kang, Gum-Bin Yu, Won-Hak Bae, Hyun-Soo Moon
Abstract
  Tandem GMAW is one of the high performance welding process and used in many industries to increase the productivity. An evaluation is presented of the mechanical properties and microstructural characteristics of the Tandem GMAW and conventional Single GMAW welds in 30㎜ thickness 490㎫ grade steel by comparison method. Welding sequence and bead with and hight was kept, avoiding the effect of the bead shape and welding sequence. Tension, bending, hardness and Charpy impact test results of Tandem GMAW met the requirement of specification and showed similar distribution with conventional Single GMAW. Volume fraction of ferrite phase in weld metal showed little difference between Tandem GMAW and Single GMAW.
Key Words: Productivity, Tandem GMAW, Mechanical properties, Microstructural charateristic, Acicularferrite
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