In the welding deformation theory, we can know, the large size of the weld has led to the greater distortion, welding the same size, welding heat input is greater, will lead to large deformation, large long seam welding, welding deformation will be smaller, the weld asymmetry or asymmetrical arrangement of welding, weld deviation will cause more serious to severe deformation.
Welding specifications through process test and process analysis in determining square tube and rectangular tube butt weld double carbon dioxide gas shielded arc welding is a welding current of the first layer 200-250A, arc voltage of the second layer is 24-26V, its process requirements is the first layer of the weld must be able to ensure good welding, to form, welding current, arc voltage, wire feed speed and welding speed needs to be adjusted more equipment.
Welding sequence to reduce distortion rectangle, welding sequence should be in accordance with the following principles: start with the middle to both sides of the symmetrical hierarchical segmentation welding, it is a good diffusion and release stress, avoiding stress in welding production complex, through the swing welding, soldering at the beginning of the formation of plastic deformation of the narrow region only once, and because of the continuous weaving welding heat input so that the heating area is too large, the compression caused by the large plastic deformation, so large deformation of welding contraction, when welding STAGED because each section is very small, the heat is also very small, each layer is divided into several sections, so each jump welding welding, basically in the cold temperature field reconstruction, each in a narrow corresponding to
the plastic deformation of the longitudinal weld layered linear shrinkage is small, rather than by oscillating continuous-time filling the welding deformation.
No comments:
Post a Comment