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ZHANG Fuju, WANG Yan, ZHANG Guodong, Wang Yutao. Ultra-fine grain steel welded joint behaiour of CO2 arc welding under low heat input[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (2): 77-80.
Citation: ZHANG Fuju, WANG Yan, ZHANG Guodong, Wang Yutao. Ultra-fine grain steel welded joint behaiour of CO2 arc welding under low heat input[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (2): 77-80.
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Ultra-fine grain steel welded joint behaiour of CO2 arc welding under low heat input

  • 1.

    College of Power & Mechanical Engineering, Wuhan University, Wuhan 430072, China

  • 2.

    College of Mechanical & Material Engineering, China Three Gorges University, Yichang 443002, Hubei, China

  • 3.

    Research Institute of Wuhan Iron & Steel Group Corporation, Wuhan 430080, China

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  • Received Date: April 15, 2007
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    • Abstract
  • The formation and mechanical properties of welded joint for 400MPa ultra-fine grain steel were studied based on surface tension transfer technology, CO2 arc welding, special narrow groove and different heat input.The results showed that the welded joint with good fusion, one side welding with back formation and narrow HAZ (heat-affected zone)(about 1 mm)was obtained with 3-4 kJ/cm heat input.The hardness and tensile strength of the joint were higher than those of the base metal.The embrittlement and softening of HAZ was not found, and the bending plasticity was qualified.The impact toughness of HAZ was about 60% higher than that of the base metal, which can be caused by the granular pearlite transition, multi- phase non-equilibrium microstructure and higher yield stress.
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