Product Description Applicable for lap seam welding of carbon steel, alloy steel and stainless steel. PLC programmable control. Variable frequency speed control, stable running, even and dense seam formation, the same anti-control strength as base material. FND I type single-roller single-seam welding. FND II double-roller double-same welding. I type overlap joint: 6-10mm. II type overlap joint: 500mm. Width: 0-1500mm,