Sheet Metal · 2021年5月7日

China’s sheet metal processing: how to deal with the deformation during sheet metal processing

China’s sheet metal processing: how to deal with the problem of deformation in the process of sheet metal processing?

I have to say that the most used sheet metal processing should be electric welding! Electric welding metal is often combined with sheet metal processing at the same time, but some things need to be paid attention to. In the process of welding sheet metal parts, the thing that must be paid attention to is to prevent the deformation of the workpiece, which is a key point. So how can we prevent the sheet metal workpiece from deforming during the welding process?

1. In the case of ensuring the basic shape of the workpiece structure, it is best to reduce the number of welds of the workpiece.

2. Balance the welding points, try to avoid concentrating the welding points in a small area, otherwise it will affect the aesthetics and easily cause deformation of the workpiece.

3. Try to arrange the welding line in the center line, preferably symmetrically, so that the aesthetics can be guaranteed.

4. It is best to take the structural design of the workpiece into consideration when welding, so that it is convenient to use the tool holder for welding and ensure that the workpiece is not deformed during the welding process.

5. Use a smaller diameter electrode and smaller current.

6. ​​Correct the welding sequence: For example, segment welding should be carried out from the middle to the two sides, and the welding should be carried out by skipping left and right to make it evenly heated.

7. Before welding, use a jig to fix the weldment to avoid warping.

8. Avoid excessive cooling or preheating of the base material.

9. Use welding consumables with low penetrating power.

10. Reduce the weld gap and reduce the degree of slotting.

11. Pay attention to the welding size and do not make the weld bead too large.

12. Pay attention to the fixing measures to prevent deformation, such as: anti-deformation, rigid fixation.

13. Selection of welding consumables: Choose the thickness of the welding rod according to the thickness of the material, which is the most suitable to meet the requirements.

14. Current and voltage: We often encounter it in actual operation. If the current and voltage are too large, the parts will break; if the current is too small, the weld will not penetrate.

15. Analyze the deformation of the box body: We should analyze in advance whether the size shrinks vertically or horizontally after welding, and which side will be deformed. In this case, the side that does not shrink can be welded first, so that the deformation is small.

16. The gap of the weld seam is not easy to be too large, and it is best not to use the thin plate with gaps, as long as the weld can be penetrated.

17. Welding tooling: For sheet metal parts or cabinets with high installation dimensions, tooling is used to control deformation and shrinkage. The tooling is mainly used for supporting and fixing, thereby reducing deformation caused by welding.

18. Beat at the weld: Most of our welders don’t have this habit, or don’t know the principle at all. Of course, lightly tapping around the weld after welding can reduce stress and thus reduce deformation. Be careful not to beat hard, only beat around, otherwise the weld will crack, and the gain will outweigh the loss.