Welding TC4 thin plates by revolution pressing in welding process

The welded residual compression stress which is larger than the critical compression stress will cause buckling distortion of TC4 thin plate after normal welding.In order to decrease buckling distortion,the method of revolution pressing in welding process was utilized to gain plastic extension in the high temperature zone of the welding bead.The residual stress can be reduced by compensating the plastic shrinkage in the high temperature zone.Tensile test,SEM analysis of the tensile testing specimen and measurement of the joints distortion after welding were carried out.The results showed that the deflection could be decreased to two thirds of the original deflection after the high temperature zone metal received revolution pressing.With increased pressing loading,the deflection reduced.In a word,the method of revolution pressing in welding process is feasible to control the deflection of TC4 thin plate weldment.