Methods to prevent and correct deformation of Urumqi steel structure engineering

In Urumqi steel structure engineering design, deformation is a common problem that requires great attention. In order to effectively prevent and correct deformation, the following methods can be adopted:

First of all, in terms of prevention, attention should be paid to the selection of materials. High-quality steel has higher strength and toughness and can better resist deformation. At the same time, during the design process, the cross-sectional size, shape and connection method of the components should be fully considered to ensure that they can meet the usage requirements and reduce the risk of deformation.

Secondly, process control during the construction process is also the key to preventing deformation. The editor of Urumqi Steel Structure Manufacturer said that in key processes such as welding and assembly, operating procedures should be strictly followed to ensure that weld quality, assembly accuracy, etc. meet the design requirements. In addition, pre-deformation technology can also be used, that is, pre-deforming the components to a certain extent before construction to offset the amount of deformation during subsequent construction.

In terms of correction, deformed components can be repaired using methods such as mechanical correction or flame correction. Mechanical correction mainly uses external force to stretch, compress or bend the component to restore its original shape. Flame correction uses the thermal stress generated by local heating to cause reverse deformation of the component, thereby achieving the purpose of correction.The editor of Urumqi steel structure manufacturer saidIt should be noted that the heating temperature and cooling rate should be strictly controlled during the correction process to avoid secondary damage to the components.

1. Steel structure engineering design measures

(1) Reasonably select the size and form of the weld. The size of the weld is directly related to the welding workload and the size of the welding deformation. The editor of Urumqi Steel Structure said that the size of the weld is too large, not only the welding volume is large, but also the welding deformation is large. Therefore, the smaller welding size should be used when designing under the condition of ensuring the load-bearing capacity of the steel structure parts.

(2) Reduce unnecessary welds as much as possible. In steel structural parts, we should strive to have a small number of welds and avoid unnecessary welds. When designing welded steel structural parts, reinforcements are generally used to improve the stability and rigidity of the steel structural parts, which is not economical because it not only increases the production workload, but also often causes large deformation of the steel structural parts after welding. This increases the workload of correction. If the plate thickness is appropriately increased and the reinforcement is reduced, it is still more economical even if the weight of the steel structure is slightly heavier.

(3) Reasonably arrange the position of the weld;The editor of Urumqi steel structure manufacturer saidWhen designing and arranging welds, the welds should be made as symmetrical to the neutral axis of the loading surface as possible, or as close to the neutral axis as possible.

2. Steel structure engineering process measures for steel structure engineering

(1) Component clamping method;

In order to prevent welding deformation of some small and medium-sized components, I usually fix the work with a clamp with good rigidity before welding. In this way, the shrinkage deformation generated during the cooling process in the high-temperature zone is forcibly overcome by the fixture. This method is especially suitable for some low-carbon steels with good plasticity, because some plastic deformation occurs near the weld, which has little effect on the mechanical strength of the low-carbon steel.The editor of Urumqi steel structure manufacturer saidHowever, this kind of behavior is suitable for the welding of high-strength steel plates, because in order to limit the welding of welding and martial arts, the stress will increase, which will easily lead to cracks. For example, trolleys on overhead cranes under 30 tons. The effect of using component clamping to prevent deformation is very good. The trolley of an overhead crane (also called traveling crane) under 30 tons is a steel structure member composed of a 6 mm or 8 mm steel plate for the retest box. Its welding surface is single (the welding is done on one side, and the shrinkage force after welding is also on one side). The amount of welding is large, and the amount of deformation is also large. The use of component clamping method can effectively overcome the shrinkage and deformation caused by the high temperature zone during the welding process and after the welding is cooled, so that the steel structure parts meet the technical requirements and ensure product quality.

(2) Anti-deformation method in steel structure engineering. In the production of some medium-plate long steel structural parts, the anti-deformation method must be used to control welding deformation. First, determine the direction and size of the deformation of the welded parts after cooling. Then, before welding, the cold-welded parts deform with equal size and opposite direction to offset the deformation of the component caused by welding anti-deformation. XinjiangSteel structure manufacturer editor saidThis method is artificially controlled. If it is mastered well, the effect will be very good and the product will meet the technical requirements. This kind of reverse deformation can be said to be plastic reverse deformation or elastic reverse deformation. Calculate the size and direction of welding deformation before assembly, and give the component a deformation in the opposite direction during assembly to offset the welding deformation.