1. The widest is 2500mm, the diameter of welded steel bar 2.5mm-6mm; 2. The distance is bigger and equal to the 50mm ; 3. The latitude silk spacing can adjust wilfully; 4. Welding transformer air fs self cooling,the power is bigger than 150KVA; 5. Time contracts welds at different times; 6. Control and reduce electrical net polluftion by waving; 7. The firessure of welding can change; 8. Control and welded antomatically, high speed high production efficiency; 9. The machines are widely used in railway,highway,high-level construction.