Welding is the heat treatment process. It is generally believed that the unequal heating of the material during the welding process, the thermal gradient of the thick steering of the plate, the strain of non -coordinated local plasticity of the material and the constraint of the residual welding constraint are the deep cause of various Deformation welds. There are several ways to prevent deformation of welding.
1. Reduce the transverse section of the welding section and use a smaller slope (angle and deviation) as much as possible under the premise to obtain a complete and non -excellent defect welding.
2. Use a small welding method with a hot input. Such as: CO2 gas protection welding.
3. Thick plates welding uses multi-platform welding instead of a single layer welding.
4. In the case of satisfying design requirements, welding vertical strengthening and improved horizontal ribs can be used.
5. When welding operations can be welded on both sides, a double-wick ramp must be adopted and the symmetrical welding welding sequence in the neutral and the axis is used during multi-layer welding.
6. When the T -shaped joint board is thick, the weld is connected to the open slopes.
7. Use the pre-assembled anti-training method to control the local deformation after welding.
8. Use a rigid luminaire to control the deformation after welding.
9. Use the component reserved length method to compensate for the vertical contraction and the deformation of the welding. For example, vertical H -shaped welds can be reserved from 0.5 to 0.7 mm per meter.
10. Twist of long components. Mainly count on improving the planeity of the board and the accuracy of the assembly of the assembly, so that the angle and the space of the slopes are correct. The direction of the arc can be precise to make the welding angle deformation and the longitudinal deformation values of the wing plate and the abdominal plate and the length of the component.
11. When the welding or structural installation of the component group with more welds, a reasonable welding order must be adopted.
12. When welding the thin plate, the welding method is used in water. In other words, in water to surround the protective gas fusion pond, and the gas is completely eliminated by gas to ensure that welding is carried out normally. In this way, the metal around the fixing tank was cooled by water over time, and the deformation volume was controlled to a small measure (the heat generated by welding the welding on the opposite side on the welding side a been added to the welding on the side).
13. Multi-stage symmetrical welding, that is to say a welding section, stop for a while, go to the opposite welding, stop for a while.
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