Welding process of composite steel plate

Welding process of composite steel plate

Abstract: Composite steel plate is a kind of plate product composed of two or more different materials by thermal bonding. This article introduces the countermeasures for welding composite steel plate, so as to provide useful reference for production and processing of composite steel plate.

Composite steel plate welding process

The welding process of composite steel plate needs to consider the characteristics of different steel materials and the thermal performance of coated materials, etc. Generally, the welding problems can be solved by choosing reasonable welding process and adopting corresponding welding parameters.

1. Base metal preparation

In order to ensure the welding quality of composite steel plate, the surface of base metal should be carefully treated before welding, including cutting and trimming, grinding and cleaning. The selection of welding cutting methods should also consider the characteristics of base metal, such as the cutting method of thermoplastic layer, which should be relatively soft in order to reduce the energy consumed during cutting. Grinding wheel and grinding wheel should be selected according to the characteristics of steel to ensure the integrity of cladding layer and make welding process more reliable. During the cleaning process, we should control the surface temperature of base metal within a certain range and use a soft cleaning tool to prevent residual surface contamination.

2. Applicable welding methods

Due to the different characteristics of composite steel plate materials, various welding methods can be used to weld composite steel plate, such as arc welding, laser welding and so on, which can form different welding performance. In general, the welding of composite steel plate should be carried out according to the sequence of dissimilar materials. The specific welding method should be selected according to the processing requirements and performance of the components.

3. Welding parameters

Different welding methods should be selected according to the welding characteristics of composite steel plate, and welding parameters, such as welding current, welding speed, protective gas flow and other parameters, should be adjusted reasonably to ensure the quality of weld. Sufficient rate of cooling water should be added when welding, and corresponding physical and chemical treatment should be adopted after welding to eliminate the internal stress of weld seam and ensure the metallurgical and mechanical properties of welded joints.

Conclusion

In a word, composite steel plate is a kind of plate product composed of two or more different materials by thermal bonding. In order to ensure the welding quality of composite steel plate, we should choose reasonable welding process, adjust welding parameters and adopt physical and chemical treatment after welding. Through the above analysis, we have a relatively comprehensive understanding of the welding process of composite steel plate, which can provide useful reference for practical application.

Welding process for composite steel plate

Composite steel plate refers to the steel plate welded by multiple steel plates. It has many advantages such as high strength, light weight, good sound insulation, heat insulation and waterproof, anti-corrosion, anti-seismic and flame-resistant and long life span. And its weldability is very important, it affects the overall strength of the plate.

In the operation process of composite steel plate welding, several factors need to be taken into account, including welding material preheating, welding method, and post-weld treatment.

Firstly, preheat the joint structure before welding, which can reduce the temperature stress of the welding structure caused by welding heat. Generally, the preheat temperature of steel structure should be higher than 50 ℃, and that of aluminum and copper alloy should not exceed 150℃.

Secondly, select the appropriate welding method. According to the amount of weldment and the characteristics of the composite steel plate, choose arc welding, butt welding, carbon dioxide (CO2) protected welding, etc., generally more than 5mm using carbon dioxide protected welding.

Finally, the post-weld treatment. According to the weld shape, size, reasonable angle cutting and grinding can be adopted. If there is impurity on the surface of the welded joint, it needs pickling and passivation. After that, it should be treated with varnish to make the weld joint look beautiful.

In summary, the welding process for composite steel plate should take into account the many factors, including preheating of joint structure, selection of welding method, and post-weld treatment to ensure that the weld joint looks beautiful and the welding strength meets requirements.