With the development of science and technology, more and more buildings are processed with steel structure, and steel structure is gradually valued by people, and has become a hot building material in the construction industry.If we don’t pay attention to the details in the welding process of steel structure, it is easy to have thermal deformation. What should be done at this time?

            1.Fixture fixation method: the rigid fixture is used to clamp the assembled weldment, and the deformation is controlled by the forced force, and then welding is carried out. This method is called fixture fixation method.

            When welding, the expansion force and contraction force generated inside the weldment are limited by the force of the fixture, which can obviously reduce the deformation.However, there is a large internal stress in the weldment by this method, which is not suitable for the components requiring less internal stress.

            2.Reverse deformation method: before welding, the component should be judged according to the condition of the metal component to be welded.During cooling after welding, the direction and shrinkage of deformation occur, and the weldment is bent or tilted in the opposite direction in advance. After welding, due to its own shrinkage deformation, it is just restored to the predetermined shape position.It can prevent welding deformation and reduce welding stress.

            3.Positioning control method: before welding, many welding points are used to locate the welding position or around the component, and heavy objects can be pressed on both sides of the weld. This method is called positioning control method.

            4.Welding sequence method: arranging welding sequence correctly is an effective method to prevent welding deformation.The rule of welding deformation is that the deformation caused by the first welding seam is the largest, and the deformation amount caused by each welding seam can’t offset each other. The final deformation direction is consistent with the deformation direction caused by the first welding seam.

            In the process of steel structure processing and installation, welding connection is often used. In order to ensure the welding quality, more attention should be paid to the processing details.