Welding Deformation Control Technoque Research Of Thin Plate

Truck crane boom is an important part, its quality is directly related to the quality and performance of the truck crane. Truck crane boom, which is typical thin-walled structure, is welded with two bending sheets. After welding, the boom will be bending deformation, which is of a great impact on the performance of the boom.This project uses a double-sided MAG arc welding, comparing with the pulse double-sided arc welding, auxiliary vibration technology, aiming at controlling welding distortion. Through the experiment result, the deformation of sheet butt-welding is mainly longitudinal deflection deformation, angular distortion can be neglected. The distance of arc impacts largely on the value of deflection deformation. When the distance is 80 mm, the value of deflection deformation is the smallest. Pulse sided arc welding and auxiliary vibration processing techniques have a good effect on controlling the longitudinal deflection deformation. The using of rigid fixation, auxiliary vibration treatment, pulse double-sided arc welding method simultaneously, is of good effect on controlling the deformation of the sheet metal butt welding.We use ABAQUS, which is a finite element method software, computed the double-sided arc welding process with heat- plastic finite element analysis. By comparing the welding thermal cycle temperature curve of heat affected zone, the transverse and longitudinal residual stress distribution after welding, the results of experiments are able to prove that the double-sided arc welding finite element model agrees well with the double-sided arc welding process. The simulation result of the relationship between the longitudinal deflection deformation and the distance of arc is also agrees well with the experiment result.The concept of the difference of longitudinal residual strain of the centerline of the welding seam has been proposed to reflect the longitudinal plastic strain distribution of both sides. Through the comparison of the longitudinal plastic strain and the distance of arc affect on the deflection deformation, we conclude that the distance of arc affects the distribution of longitudinal plastic strain, and then affect on the deflection deformation. Thus demonstrate the relationship between the the arc spacing and welded longitudinally flexural deformation.