Main factors affecting the welding deformation of rectangular pipe:

According to the welding deformation theory, the main factors that affect the welding deformation of rectangular pipes are: the larger the weld, the larger the weld metal deformation; With the same welding size, the welding heat input is large, resulting in large deformation; Large and long welds are welded, and welding deformation passes through small sections; Although the welds are arranged asymmetrically or symmetrically and asymmetrically, the weld deflection is more serious and the deformation is more severe; The smaller the member, the greater the deformation.

Welding standard After process experiment and process analysis, it is confirmed that the butt weld of rectangular pipe is welded by double carbon dioxide gas maintenance arc welding. Welding data h08mn2sia, 1.2 mm line; Pure carbon dioxide gas maintenance gas. The welding current of the first layer is 200~250 A, 240~east, and the second layer; The arc voltage is 24~26v. The process requirements are: good welding must be ensured for the first layer of weld, and the composition is later; The welding current, arc voltage, wire feeding speed and welding speed are based on the equipment type conditioner.

For rectangles with reduced deformation in welding sequence, the following criteria shall be followed in welding sequence: symmetrically weld in layers and sections from the middle to both sides. The welding deformation is small after welding, which is conducive to stress diffusion and release and prevents complex stress consumption in welding. After swing welding, the plastic deformation of the narrow zone formed at the beginning of welding only occurs once. Because of continuous swing welding, heat input, large heating area, and large area caused by shrinkage plastic deformation, the welding shrinkage deformation is large.

Each layer is welded by layers and sections. Each section is very small and has little heat. Each layer is divided into several sections. Each welding skip is basically a reconstruction of the temperature field of the cold plate. Each time, plastic deformation occurs in a narrow area. The plastic deformation area (that is, the size of horizontal shrinkage of uniform width) has smaller longitudinal shrinkage than the corresponding layered straight welding, rather than the welding deformation after continuous filling and swinging.

Welcome to contact us at any time.