13 true sutra to prevent welding deformation, 20 minutes to learn welding knowledge.

【Summary Description】 Due to the occurrence of welding deformation is mostly due to the asymmetry of the heat generated by welding, resulting in uneven expansion. Several methods to prevent welding deformation are sorted out as follows for reference: 1. Reduce the cross-sectional area of the weld, under the premise of obtaining a complete weld with no over-standard defects, as far as possible to take a smaller groove size (angle and gap). 2. The welding method with small heat input is adopted. Such as: CO2 gas shielded welding. 3. Multi-layer welding shall be used instead of single-layer welding for thick plate welding as much as possible. 4. In the case of meeting the design requirements, the longitudinal reinforcing ribs and transverse reinforcing ribs can be welded by intermittent welding. 5. When both sides can be welded, double-sided symmetrical groove shall be adopted, and the welding sequence of neutral axis symmetry with components shall be adopted in multi-layer welding. 6. When the thickness of the T-joint plate is large, the open groove angle butt weld is adopted. 7. The angular deformation after welding is controlled by the anti-deformation method before welding. 8. The rigid fixture fixing method is used to control the deformation after welding. 9. The longitudinal shrinkage deformation of the weld is compensated by the reserved length method of the component. Such as: H-shaped longitudinal weld per meter can be reserved 0.5~0.7mm. 10. For the distortion of long members. Mainly by improving the flatness of the plate and component assembly accuracy, so that the groove angle and gap accuracy. The direction or centering of the arc is accurate, so that the angular deformation of the weld and the longitudinal deformation of the wing plate and web are consistent with the length of the component. 11. In the assembly welding or structural installation of components with more welds, a reasonable welding sequence shall be adopted. 12. When welding thin plates, the water welding method is adopted. That is, the molten pool is surrounded by a protective gas in the water, and the water nearby is completely eliminated by the gas to ensure the normal welding. With this method, the metal around the solid molten pool is cooled by water in time, and the deformation is controlled to a small extent (circulating coolant is added on the opposite side of the welding side to take away the heat generated by welding). 13. Multi-section symmetrical welding, I .e. welding one section, stopping for a while, welding to the opposite side, stopping for a while.

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