Before selecting the welding process parameters, an in-depth analysis of the material and structure of the product should be carried out, focusing on the analysis of the weldability under the combined effect of the chemical composition and structural factors of the material; at the same time, the heat of the welding heat cycle on the base metal and the weld should be considered. It is also another main basis for guaranteeing qualified products, which is the guarantee of obtaining the minimum welding stress and deformation of the welded joint.

The specific method of selecting welding process parameters is to find the relevant information of various welding methods according to the material of the product, the thickness of the weldment, the form of the welded joint, the spatial position of the weld, the assembly gap of the joint, etc., plus the workers’ Practical experience to determine the welding process parameters. In addition, the welding sequence, welding direction, and deposition sequence of multi-layer welding also have a certain impact on the formation of welded joints, so careful consideration and process testing must be carried out at the same time.
After the welding process parameters are determined, all welding preparations must be done as required before welding.
Welding is a key process in the manufacture of steel structures. In the welding of steel structures, the welding quality must be strictly controlled to ensure that the welding quality meets the relevant technical requirements of the steel structure grid structure.