How to prevent thermal deformation of steel structure welding?
With the development of science and technology, more and more buildings are built with steel structure, and its structure has gradually been valued by people and has become a popular building material in the construction industry. If you do not pay attention to details in the welding of steel structures, it is easy to cause thermal deformation. What should you do at this time?
Reasons for deformation during forming
1. The deformation that occurs in the processing of complex steel structures mainly includes thermal deformation, cold deformation or the inability of interrelated components to be assembled into one.
2. Thermal deformation is often caused by improper welding process. Cold deformation is caused by large volume and poor rigidity. Interrelated components cannot be assembled into one, which is related to inaccurate lofting and marking, wrong assembly sequence or deformation.
Operation method to reduce welding thermal deformation
1. Fixture fixing method: Clamp the combined weldment with a rigid fixture, control the deformation with a forced force, and then perform welding. This method is called the fixture fixing method.
The expansion force and contraction force generated inside the weldment during welding are limited by the force of the fixture, which can significantly reduce the deformation. However, there is a large internal stress inside the weldment by this method, and this method should not be used for components that require a small internal stress of the weldment.
2. Reverse deformation method: Before welding steel components, it should be judged according to the condition of the welded metal components. When cooling after welding, the direction of deformation and the amount of shrinkage occur, and the weldment is pre-bent or inclined in the opposite direction. After welding, due to its shrinkage and deformation, it just returns to the predetermined shape and position. The purpose of preventing welding deformation and reducing welding stress can be achieved.
3. The positioning control method is adopted: Before the component is welded, many welding points are used to position the welding part or its surroundings, and heavy objects can also be pressed on both sides of the welding seam. This method is called the positioning control method.
4. Welding sequence method: Correctly arranging the welding sequence is an effective method to prevent welding deformation. The law of welding deformation is that the deformation caused by one weld is large, and the amount of deformation caused by each weld generally cannot offset each other.
In the process of processing and installation of steel structure manufacturers, welding connection is a frequently used connection method. In order to ensure the welding quality, more attention should be paid to the processing details during processing.
