Research And Application Of Controlling Welding Stress And Welding Deformation Appearing In Active Arms Of Loading Machine And Digging Machine

Based on the experimental study of the welding deformation and welding crack appearing in the course of welding in active arms of loading machine ZL50C and digging machine CLG200-3, projects are settled to control welding deformation and welding stress by analyzing reasons of welding deformations, welding cracks and testing welding residual stress. In addition ,the projects are used for welding active arms of loading machine ZL50C to control its welding deformation.The essence of welding deformation and welding stress appearing in the course of welding in active arms of loading machine and digging machine is analyzed in theory ,we established a whole project that's used to control welding deformation of loading machine and welding stress of digging machine, which have theoretically directive sense in practical course of production.Welding stress is tested in local workshops ,furthermore, the distributing of welding stress and the changing trend of welding stress are analyzed, which are important to control welding deformation and welding stress in the course of practical production.Aiming at the angle and distort deformation appearing in the course of welding in loading machine active arms combinations,the reasons of the deformation is analyzed in theory and local producing techniqes ,then the deformation is successfully resolved by means of selecting correct welding methods , welding orders and optimizing welding criterion design.According to the testing result of welding deformation and welding stress of loading machine and digging machine, we got a series of conclusions,one of which shows that backstep welding can greatly reduce welding deformation of loading machine compared with direct welding method, and active arms can satisfy the request of production design by means of backstep welding without rectification.