How to solve the deformation of weldments in electric fox welding?

To solve the deformation of weldments during arc welding, measures should be taken from the aspects of structural design and process measures to effectively prevent or reduce welding deformation according to the causes and types of welding deformation, and should be controlled from the following aspects:

1. Reasonably determine the shape of the groove and reduce the size of the weld, because with the increase of the size of the weld, the welding deformation will also increase. However, too small weld size will reduce the bearing capacity of the structure, and at the same time accelerate the cooling speed of the joint, which is prone to defects such as cracks and increased hardness of the heat-affected zone. Therefore, under the premise of satisfying the bearing capacity of the structure and ensuring the welding quality, the appropriate weld size should be selected according to the plate thickness.

2. Divide the components into several parts appropriately, assemble and weld them separately, and finally assemble and weld them into a whole. In doing so, asymmetrical welds or welds with a large amount of shrinkage can shrink freely without affecting the overall structure.

3. The selection of relatively small welding current and correct welding sequence can effectively reduce the welding deformation, when the structure has a symmetrical arrangement of welds, by two welders at the same time symmetrical welding, the deformation caused by symmetrical welds can cancel each other. Segment welding, backward welding, skip welding, etc., reasonable arrangement of welding sequences can control welding deformation.

4. If it is a large number of workpieces, the deformation law can be found, and the deformation amount can be reserved for reverse deformation when assembling.

5. Use fixtures, supports, special fixtures, positioning welding and other tools and methods to rigidly fix the weldments to increase the rigidity of the structure, which is very effective in reducing deformation.

5. If the deformation has occurred, the flame correction can be done on the weldment.

Reasonable welding tooling and correct welding sequence can effectively reduce welding deformation;

If it is a large number of workpieces, the deformation law can be found and the reverse deformation can be carried out first.

1. Because during the welding process, the weldment is subjected to local and uneven heating and cooling. Therefore, the degree of thermal expansion and contraction of metal in each part of the welded joint is different. Because the weldment itself is a whole, each part is interconnected and mutually restricted, and cannot be freely elongated or shortened, so stress and deformation will occur during the welding process.

2. Attention should be paid to the thickness of the plate during the first shock welding, the more layers welded, the greater the deformation, at this time, it should be welded on the reverse side, pulled on the transverse bar, and welded in sections on the front to prevent the plate from being too high in temperature and serious in deformation. Before welding, the deformable welding consumables should be fixed on the platform to make the deformation probability of the welding consumables smaller or not deformed. If the weld bead is not clean or the width of the weld bead is different, the probability of plate deformation will increase, so it should be noted.

3. The welding process and the groove of the plate, the flat plate docking needs a groove, so that the plate can improve the welding quality and tensile force of the plate. Different fracture welding processes are different, and thin welding rods, small current, and positive and negative welding processes should be used for grooves, and the probability of deformation is greatly reduced.

4. If the welding plate is too thick, the plate should be preheated, and the welding rod should be preheated, and the plate will not be deformed under the condition that the temperature difference is not large. If the temperature difference is large, the plate is deformed and warped, and it is difficult to restore the flatness after welding, which should consider the material of the plate.