Why Pulsed MIG Welding?
Prior to using the pulsed MIG features of the new equipment, Weir’s nine welding operators were predominantly working with spray transfer. Pulsed MIG, also called pulsed spray transfer, improves the spray transfer process by pulsing small droplets of filler metal across the arc at a controlled time in the welding cycle. The pulsing occurs because the power source switches welding output rapidly between a high peak current to a low background current. The peak current pinches off spray-transfer droplets and propels them toward the work piece for good fusion. Because there is no metal transfer during the background current, the weld puddle has an opportunity to freeze, as opposed to spray transfer where molten drops are continuously transferred.
