How to control and solve welding in steel structure processing

In the process of welding construction, steel structure manufacturers control welding deformation is one of the key problems. This deformation in the process of steel structure processing is mainly due to the rigid deformation or plastic deformation caused by the temperature change in the welding process. Welding deformation can seriously affect the strength and toughness of welded joints and reduce their corrosion resistance. To avoid welding deformation as much as possible, the following measures can be taken:

1. Reasonable arrangement of welding groove to reduce welding deformation;

2. In the processing of steel structure, try to avoid stress concentration;

3. Fillet welds should take corresponding anti-deformation measures, such as symmetric components, using synchronous asymmetric welding technology;

4. Select the right welding materials and adopt the right welding process to reduce welding stress.

In addition, in the process of steel structure processing should also pay attention to the following aspects:

1. When the steel structure workpiece is welded with low-temperature welding technology, the welding strength is different due to the different preheating temperature, especially in the thick plate welding, the low temperature will greatly affect the strength index of the steel plate, which is because the hardness of the steel is very low and easy to embrittlement under low temperature conditions. At the micro level, because the low temperature will accelerate the cooling rate of the weld, a brittle structure called martensite is created between the weld and the heat-affected zone. Therefore, when using low-temperature welding, special attention should be paid to the impact of ambient temperature on welding.

2. When selecting the groove form of the welded joint, in order to fully weld the arc to the root of the weld, it is necessary to open the groove on the joint. When selecting the groove shape, the groove form that is easy to process should be selected to ensure that the weld can be completely welded, thus reducing the welding cost and reducing the possibility of deformation after welding.

3. In the selection of welding materials, when selecting welding materials, it is necessary to fully consider the chemical composition of the base material, physical and mechanical properties, joint form and other factors. If the welding material is not correctly selected, it is easy to produce brittle cracks in the transition zone of the weld. Therefore, under the premise of ensuring the design strength, low hydrogen alkaline or titanium-calcium electrode should be selected as far as possible, because its yield strength is low and its impact toughness is better. At the same time, the fatigue strength of the electrode is improved by preheating the electrode.

Only the welding link, the need to fully consider the various factors of construction, therefore, steel structure processing manufacturers should have a comprehensive, detailed evaluation system and indicators to ensure the quality of production and processing products, to provide customers with good products and services.

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