Finite Element Analysis of Tungsten Inert Gas Welding Temperatures on the Stress Profiles of AIS1 1020 Low Carbon Steel Plate

摘要

For betterunderstanding of the residual stress fields associated with Tungsten Inert Gas(TIG) welding, thermal analysis was carried out using Solid Works 2017 versionand ESI Visual-Environment to compute the transient temperature profile due towelding thermal loading and resulting stress field in three categories namely;von-mises stress, axial stress and thermal stress. A range of welding temperaturesincluding 1746oC, 1912oC, 2100oC, 2410oCand 2800oCwere experimentally applied in the joining process of AISI 1020 low carbon steel plate of 10 mm thickness and a strain gauge was usedto measure the thermal stresses induced in the steel plate which the averagewas recorded as 38,200MPa. The experimental parameters and conditions were appliedin finite element simulation of the same plate dimension, and average von-misesstress of 37,508 MPa, average axial stress of 30,732 MPa and averagethermal stress of 20,101 MPa was obtained. However, it was observed that thehigher the welding temperature, the higher the stresses induced in the weldingmaterial. Hence, temperature for TIG welding process should be regulated at itsoptimum to avoid fatigue acceleration,stress propagation, early crack nucleation and possible fracture on the weldedcomponent which may limit the longevity and performance of such component inits service condition.