Effect of clamping methods on welding process of TC4 thin plate
In order to reveal the influence of constraint conditions on residual stress and deformation after welding,various clamping constraint schemes were designed in this paper,and TIG butt welding simulations were conducted on TC4 thin plates.The results showed that the isotherm of the welding temperature field was elliptical,with a large temperature gradient in front of the welding heat source and a small temperature gradient in the back.The welding pool was in the form of teardrops,with a higher temperature on the upper surface of the thin plate and a lower temperature on the lower surface.Welding deformation was mainly in the thickness direction,and there was a tendency for the thin plate to contract towards the weld seam after welding.The deformation of the thin plate was mainly concentrated in the center of the weld seam,which was prone to forming welding corner deformation and deflection deformation.The residual stress after welding was mainly longitudinal stress,manifested as tensile stress in the weld zone,and compressive stress far away from the weld zone.The residual stress was mainly concentrated within the area 5 mm away from the weld.Placing the fixture on both sides parallel to the weld direction and close to the weld could release residual stress in the plate and reduce welding deformation.The above conclusions could provide a certain theoretical reference for the clamping constraints of TC4 thin plates.
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