ZX7, choosing the advanced IGBT technology as the main power device and adopting the most advanced Full-Bridge Phase-Shift Soft-Switching technology to improve the quality of our products. As a result ,it has the functions as follows :reducing the waste of switching- tube , improving the efficiency of our products, thrust control. It is suitable for sheet welded and can make freely weld from 0A to 630A .This kind of welding apparatus has many virtues as follows: quickly reflected speed ,small volume ,light weight, high efficiency, low waste in zero-load and so on. It has been placed in the catalog of high-tech products and which is replacing the traditional welder step by step.