After the wire is fed into the driver roller, the welder is turned on, and the trigger is pulled on the gun. The drive roll activates and feeds the wire into the liner of the gun. Drive tension is adjusted until the wire feeds smoothly through the gun without "bird nesting." The wire is then cut off 3/16 inch away from the tip of the gun. It's a good idea to cut the small section of old wire off the end before you begin welding because it will lessen the initial pop from the welder at the beginning of each weld.