When adjusting the value Welding-speed. Make the temperature less melting because it WS. Increased skin Roller touch the pieces faster and thus causing intermittent welded Seam .
When adjusted for Welding-speed increase in the melting temperature less because WS increased skin Roller. Contact with the workpiece faster. Thus resulting in a discrete Seam.
When adjusting the Welding-speed increased, the temperature used in the melting less, because WS increased contact with the workpiece surface Roller faster. It marks Seam discrete .