Rectangular tubes are widely used at present, so how to prevent their deformation during use?

1. Usually, the welding deformation of square tubes is corrected by the fire attack, but if it becomes too large, the effect is not very ideal. To control the welding deformation, in addition to adopting a reasonable welding sequence and welding process, small anti-deformation treatment can also be carried out in advance, the effect is better. Use angle steel and square tubes to weld the rice support inside the box. In short, it can be fixed. After welding, use gas cutting to cut off; welding power source: you can use a heat source with more concentrated thermoelectricity so that the relative heat input is reduced, such as molten electrode welding Better than manual arc welding, square tube hot wire TIG welding is better than conventional melting electrode welding, laser, plasma, and electron beam welding are all welding methods that use concentrated heat sources of thermoelectricity to achieve small deformation.

2. Remove the welding stress by changing the welding sequence and method.

3. Welding sequence: adopting a suitable welding sequence, such as symmetrical welding, can reduce welding deformation.

4. Reverse welding deformation: Before welding, predict what kind of deformation will occur after welding, and then start welding in the opposite direction to allow a certain amount of deformation to weaken the welding deformation.

5. Strong restraint during welding. The welding process can control the welding deformation by hammering with welding, or pre-set tensile stress of the thin plate.

6. Stress annealing can be used after welding to remove or reduce welding deformation (generally speaking, welding deformation cannot be completely removed, but only relatively speaking).

7. Of course, it is directly related to the welding material. The larger the coefficient of linear expansion, the easier it is to deform greatly during welding. Therefore, it is also possible to select the appropriate welding material according to the requirements, change the structure of the welding head, and thus change the welding deformation.