Shanghai Haojing Robotics, relying on advanced technology and meticulous service, is committed to project integration and application, flexible manufacturing engineering solutions, and customized welding robot workstations and automated production lines according to your product requirements.Shanghai Haojing Robotics, relying on advanced technology and meticulous service, is committed to project integration and application, flexible manufacturing engineering solutions, and customized welding robot workstations and automated production lines according to your product requirements.
product description
Medium-frequency Inverter DC Spot Welder, Pneumatic Medium-frequency Inverter Spot Welder Brand: Shanghai Haojing Model: SMD-20 Rated Capacity: 50KVA Maximum Short-circuit Current: 20KA External Power Supply: 380V/3φ Duty Cycle: 50% Maximum Working Pressure: 7.2KN Electrode Stroke: 80MM Cooling Water Flow Rate: 30L/MIN. Our SMD-20 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:
The SMD-20 medium-frequency inverter DC spot welder boasts broad applicability, featuring a compact welding transformer with high output energy. By elevating the welding transformer frequency from standard 50/60Hz to 1000Hz, it significantly reduces core material weight. Additionally, rectifier diodes in the secondary circuit convert AC power to DC for the welder, substantially improving secondary inductance values and saving over 30% in user power consumption.
Product Advantages:
1. High welding stability;
2. Over 30% energy savings, low operating costs;
3. Three-phase balanced input with power factor up to 95%;
4. Lower welding current and electrode pressure requirements;
5. Minimal secondary circuit inductive energy loss;
6. Doubles electrode lifespan, reducing grinding time;
7. Substantially reduces installation costs for electrical systems and auxiliary facilities like water/gas;
8. Enables more precise, rapid, and comprehensive control and analysis of welding parameters.

Step into Haojing
China’s professional manufacturer of automation equipment
Haojing Robotics (Shanghai) Co., Ltd., a subsidiary of Shanghai Haojing Electromechanical Co., Ltd., has a registered capital of 5 million RMB. Founded in 1999 and located in Xinbang Town, Songjiang District, Shanghai, Shanghai Haojing Electromechanical Co., Ltd. is a high-tech enterprise integrating the design and production of non-standard robotic automation equipment. Adhering to the development philosophy of “survival through quality, development through reputation, and innovation through technology,” the company is committed to solving customers’ urgent and practical needs with superior technology and service, providing professional automation equipment solutions with high-quality products and innovative design concepts.
Partner Brands
Our 4 major advantages
1.Years of experience in the brand industry
Haojing is a comprehensive enterprise specializing in industrial robot system integration and application. It integrates R&D, manufacturing, sales and service, and has successfully created a series of robot automation projects for many users, providing products and services to many industries and enterprises.



















































