What are the quality indicators for evaluating the welding points of intermediate frequency spot welding machines?

What are the quality indicators for evaluating the welding points of intermediate frequency spot welding machines?

The spot welding process of medium frequency spot welding machine is widely used to weld thin metal structural components of cars, buses, commercial vehicles, etc. due to its advantages of high efficiency, low consumption, mechanization, and high degree of automation. So how to ensure the quality of spot welding joints is one of the key factors in improving the overall quality of automobiles.

The quality indicators for evaluating solder joints mainly include their tensile and shear strength. The occurrence of spot welding defects such as open welding, incomplete welding, burning through, and deep indentation is due to low tensile and shear strength. The latter two types of defects are highly intuitive and can generally be avoided; The first two types of defects have poor visual perception and high harm, so they must be given sufficient attention during welding.

During welding, if the diameter of the electrode head grows too fast or too large, it is detrimental to production. Excessive growth leads to more auxiliary time for correcting electrode heads, high labor intensity for workers, and high consumption of electrode materials; Excessive growth results in a decrease in welding current density, a decrease in welding heat per unit volume, poor penetration of solder joints, reduced size of weld nuggets, and even no formation of weld nuggets, resulting in open welding and incomplete welding, and a significant decrease in welding strength.

So, the factors that affect the quality and production efficiency of spot welding are electrode material, electrode shape, spot welding specifications, water cooling circulation system, electrical system, workpiece surface quality, and human operation. The main reasons are electrode material and electrode shape. To sum up, it is how to prevent and reduce the growth of electrode head diameter, and ensure good retention of electrode head diameter size.