Using the way of spark to weld the mesh. With two cylinders, controlling by microcomputer, pressing, forging, welding could be done at the same time. The machine cost 3 times less without using electrode. Welding slit is smooth and beautiful, and the strain of the wire is high. The welding speed can be adjusted. The mire diam can be welded from 3mm - 10mm. It is a new generation of LF Grid Machine.