Abstract
his paper relates to the dissimilar welding joints of 45, 0Cr18Ni9 and 1Cr9Mo steel using the different welding metal A302 or Inconel182. The thermal stress numerical simulation is carried out to the dissimilar welding joints. The thermal stresses of dissimilar welding joints generated in the heating to 450°C from the ambient temperature for 45/1Cr9Mo and 45/0Cr18Ni9 and 500°C for 1Cr9Mo/0Cr18Ni9 are calculated by finite element method. It is shown that large tensile stress is generated in the weld metal, fusion line and heat affected zone (HAZ) when the welding metal is A302, while the compressive or low tensile stress is shown in the HAZ and fusion line of 1Cr9Mo or 45 steel. The maximum circumferential stress is presented in 1Cr9Mo or 45 steel, while the large compressive or low tensile stress is shown in 0Cr18Ni9. The stress is decreased when the A302 is changed to Inconel182. It is concluded that the replacement of A302 by Inconel182 can decrease the thermal stress and increase the life of the welding joint.
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