Medium frequency inverter DC spot welding machine SMD-80

Medium-Frequency Inverter DC Spot Welder, Manufacturer: Shanghai Haojing, Model: SMD-80, Rated Capacity: 200KVA, Maximum Short-Circuit Current: 80KA, External Power Supply: 380V/3φ, Duty Cycle: 50%, Maximum Working Pressure: 18/29KN, Electrode Stroke: 160MM, Cooling Water Flow Rate: 60L/MIN. Our SMD-80 medium-frequency inverter DC spot welder features fully digital control via a human-machine interface touchscreen for intuitive operation. Performance can be expanded through PC programming. Custom fixture designs accommodate diverse workpiece welding requirements, and automated special-purpose machines can be engineered to enhance production efficiency.
Product Overview:
1. Welding current approaches pure DC. With no significant peak current in medium-frequency inverter spot welders, the weld nugget expands stably with minimal spatter, ensuring consistent weld quality and high thermal efficiency. Compared to power-frequency welders, medium-frequency welders reduce welding current by 40%, significantly extending electrode lifespan.
2. Reduces interference in secondary circuits with large open areas. Zhejiang Haojing Electromechanical’s medium-frequency spot/projection welders operate on DC current, ensuring welding remains unaffected even when magnetic materials are present in the secondary winding.
3. Response time is only 1/20th that of utility-frequency AC spot welders. Current reaches set values faster, enabling more precise parameter analysis and tighter weld quality control.
4. Three-phase load balancing with high power factor (around 0.9) enhances energy efficiency. It adapts better to grid fluctuations and voltage drops, as part of the energy is stored by the inverter and supplied back to the load, replacing direct grid power supply. In contrast, two-phase power frequency welders struggle to maintain balanced phase voltages during operation, resulting in low power factor (around 0.6), while three-phase power frequency welders often fail to achieve constant current output.
5. Medium-frequency inverter spot welders are suitable for welding various materials and dissimilar metals, such as aluminum alloys, stainless steel, and high-strength steel plates. Additionally, their welding quality for galvanized sheets and ordinary multilayer plates significantly surpasses that of conventional welding machines.
6. Precision machining employs CNC machine tools to process all components, ensuring reliability and accuracy of each part.
7. Superior electrical performance structure with an advanced HJ-SMD controller offering robust functionality and upgrade capabilities.
Comparison Between Medium-Frequency Inverter Spot Welders and AC Spot Welders
1. High welding stability;
2. Over 40% energy savings with low operating costs;
3. Balanced three-phase power input achieving a power factor up to 95%;
4. Lower welding current and electrode pressure requirements;
5. Minimal inductive energy loss in the secondary circuit;
6. More than double the electrode lifespan, reducing grinding time;
7. Substantially reduced installation costs for electrical systems and auxiliary facilities like water/air supply;
8. More precise, rapid, and comprehensive control/analysis of welding parameters;
9. Shorter welding cycles, boosting productivity and weld quality;
10. Wider application range with superior performance on low-carbon steel, stainless steel, copper, aluminum, and galvanized sheet metal.