Stitch welding machines are great for a nice, smooth finish to welded materials. This machine welds using conducted copper wire to form a smooth, need weld without any damage to the galvanized surface. The welding machine uses high quality welding rollers to increase the service life and power efficiency, as well as ensure a fast, effective welding process. The duct welding machine carries out pulse and continuous welding, with an adjustable welding speed using the control panel.