Resistance Pneumatic Spot Welding Machine China Spot Welding Machine Manufacturer

Selection of spot welding process parameters: The process parameters affecting spot welding include the structure diameter of the welding electrode, welding energy, welding time and welding pressure. According to the welding speed and welding effect, it can be divided into three conditions: fast welding, medium speed welding, and ordinary welding. For the occasions where the workpiece requires high welding strength and small welding deformation, it is best to use high-power, short-time strong specification fast welding. For workpieces with less strict requirements, ordinary welding methods with low power and long time can be used, so that relatively small welding equipment can be selected, and the impact on the power grid is also relatively small. Usually based on the material and thickness of the work piece, refer to the welding condition table of this material to select, first determine the shape and size of the end face of the electrode, secondly select the electrode pressure and welding time, and then adjust the welding current to weld the sample with different current After verifying that the nugget diameter meets the requirements, adjust the electrode pressure, welding time and current within an appropriate range, and perform welding and inspection of the sample until the quality of the welding spot fully meets the requirements specified in the technical conditions. The most commonly used method for testing the sample is the tearing method. The mark of the high-quality solder joint is: there is a round hole on one piece of the teared sample, and a round boss on the other piece. Thick plates or quenched materials sometimes cannot tear out round holes and bosses, but the diameter of the nugget can be judged by the fracture of the shear. When necessary, low magnification measurement, tensile test and X-ray inspection are also required to determine the penetration rate, shear strength and the presence or absence of shrinkage holes and cracks. When selecting the process parameters based on the sample, the difference between the sample and the workpiece in the shunt, the influence of the ferromagnetic substance, and the assembly gap must be fully considered and adjusted appropriately.

The main factors affecting the welding quality of spot welding joints are welding current, electrode pressure, welding time, preload and rest time, welding electrode diameter and so on.