Lincoln Electric has introduced a new line of Magnum PRO semiautomatic welding guns. The 250, 350, 450 and 550 guns for MIG, pulsed MIG and flux-cored welding processes are built for high amperage and high-duty cycle applications, where heat resistance and serviceability are critical, such as industrial fabrication, heavy equipment, ship building and construction. All four guns are rated for 100-percent duty cycle, and with Lincoln's PRO Select gun selection system, users can choose the right gun based on their welding amperage and application and not just the rating of the machine.