| Since stainless steel has the characteristics of high strength, corrosion resistance,it is widely applied in urban rail transportation industry with good social andeconomic benefits. Welding techniques for stainless steel sheet applied in railwayvehicles manufacturing filed include electric-arc welding, gas shielded welding andelectric resistance welding (ERW). Especially, laser beam welding (LBW) isgradually used due to its unique advantages. In order to study the application ofelectric resistance welding and laser beam welding in railway vehicles of stainlesssteel manufacturing, finite element method (FEM) analysis software ANSYS wasutilized in this paper to establish electric resistance welding and laser beam weldingmodel. Under the same loading conditions, the maximum value and distribution ofstress and strain in the welding of ERW and LBW were compared and analyzed basedon the actual production. In the same time, the maximum value and distribution ofresidual stress in the welding of ERW and LBW were calculated. On the basis of thisstudy, the application and potential development of ERW and LBW were discussed inrailway vehicles of stainless steel manufacturing.In order to analyze the stress value and strain distribution in two welding jointsof ERW and LBW under the same loading along X, Y, Z direction, welding residualstress intensity and distribution of ERW and LBW stainless steel sheet, thecomparative investigation was conducted and came to the conclusions: when3000Ntensile strength along Y axis direction loaded, there exists a maximum stress of305.013MPa in laser welding joint and360.609MPa in resistance welding joint; whenthe tensile strength of3000N along X axis direction loaded, the maximum stress is310.237MPa in laser welding joint and325.899Mpa in resistance welding joint; whenthe tensile strength of200N applied along the Z axis direction, the maximum stress inlaser welding joint is127.464MPa and302.699MPa in resistance welding joint. Themaximum residual stress in laser welding joint is207MPa with an average of12.3MPa; the maximum residual stress in resistance welding is404MPa with an average of25.3MPa. Residual stress nephogram shows that residual stress evenlydistributed and barely exist abrupt stress change in laser welding joint. But theresidual stress distribution of resistance welding joint appears nonuniformly andgenerally with big value around the welding spot. Compared the results of FEManalysis with actual production, the conclusions were drawn that laser weldingtechnique was better than resistance weld technique in railway vehicles of stainlesssteel manufacturing filed.In sum, laser welding joint had lower stress and residual stress under the sameload compared with resistance welding joint, and there existed no obvious stressconcentration. If used the same welding specifications and used in the same workingcondition, welding joint manufactured with LBW technique is more suitable inrailway vehicles manufacturing filed. |
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