Numerical simulation of multi-pass welding between 6061-T6 aluminum alloy medium thick plate and sleeve
To study the distribution of the residual stress and deformation of aluminum alloy plate-to-sleeve joints after multi-pass welding,a three-dimensional finite element model of the joint established based on ABAQUS software.The double ellipsoid heat source,element birth and death method and sequential coupling method were all applied to simulate the multi-pass welding of 6061-T6 aluminum alloy plate-to-sleeve joint.The temperature field of the joint and the distribution of welding residual stress and deformation under clamping constraints was analyzed.The results show that the simulated molten pool morphology accords with the experimental one.The temperature curve shows a multi-peak structure during the weaving welding process.The heating rate of the weldment is greater than the cooling rate,and the cooling rate decreases with time.The welding residual stress is mainly concentrated in the weld and clamping area and it is less than the yield strength of 6061-T6 aluminum alloy at room temperature.The maximum transverse residual stress of the joint is 129.9 MPa,and the transverse residual stress on the medium-thick plate is greater than that on the sleeve.The maximum longitudinal residual stress of the joint is 132.9 MPa.Along the welding direction,the longitudinal residual stress distribution at the weld is as a mountain shape.The maximum deformation of the joint is 1.494 mm in the Y-axis direction,and the final deformation of the joint is convex.
NETL
NSTL
万方数据
维普
