Impact of Welding Time on Welding Performance of Capacitor Energy Storage Spot Welding Machine

Capacitor energy storage spot welding machines are widely used in the mechanical field. They consist of several parts such as the mechanical part and the electrode part, including the frame, capacitor group, transmission mechanism, rectifier transformer, and electrical control.

Designed in a desktop structure, equipped with a foot switch, the electrode head is made of chromium-zirconium copper material, economical and durable. The electrode pressure is generated by various springs, reducing inertia and friction. The machine adopts a soft start mode with fully digital integrated current control for faster and more stable constant current charging, eliminating the need for current-limiting resistors to avoid energy waste, saving 40% more electricity compared to regular welding machines.

It pre-charges a group of high-capacity capacitors through a small transformer and then uses a high-power resistance welding transformer to weld the welded parts. PLC control core effectively controls the charging and discharging process. The pre-pressing, discharging, upset forging, maintaining, pause time, and charging voltage values can be adjusted separately, making adjustment very convenient.


It draws instant low power from the grid, balances the load of each phase, has a high power factor, provides heat to the welding area, and offers superior welding performance. With minimal welding power consumption, besides saving power, the greatest advantage of capacitor energy storage spot welding machines is the brief discharge time and large instantaneous current. Because of the rapid welding time, the welding point is only 0.003-0.02 seconds, resulting in minimal oxidation and deformation of the weld surface, thereby reducing processing steps.

Stable Welding Energy:

Since the charging stops and enters the discharge welding only after the charging voltage reaches the set value each time, the welding energy fluctuation is extremely small, ensuring excellent weld quality.

In each welding cycle of the capacitor energy storage spot welding machine, the duration from welding current to stoppage is called welding time, abbreviated as welding time. The impact of welding time on joint performance is similar to the impact of welding current. However, two points should be noted:

The curve will not immediately drop after point C because although the nugget size has reached saturation, the plastic ring can still expand to a certain extent. In addition, the heating rate of the heat source is relatively slow, so splashing usually does not occur.

Welding time has a significant effect on the ductility ratio representing the plasticity index of the joint. Therefore, for spot welding joints made of metal materials (such as hardenable steel, molybdenum alloy, etc.) that are subjected to dynamic loads or are prone to brittleness, the effect of welding time on tensile loads should also be considered.

Suzhou Agera Automation Equipment Co., Ltd. specializes in the development of automated assembly, welding, testing equipment, and production lines, primarily serving industries such as household appliances, automotive manufacturing, sheet metal, and 3C electronics. We offer customized welding machines, automated welding equipment, assembly welding production lines, and assembly lines tailored to meet specific customer requirements. Our goal is to provide suitable overall automation solutions to facilitate the transition from traditional to high-end production methods, thereby helping companies achieve their upgrade and transformation goals. If you are interested in our automation equipment and production lines, please feel free to contact

Post time: Apr-01-2024