Ordinary engine driven welders keep the engine running from when they are started until they are stopped. However, Denyo engine welders, such as DLW-500ISW, have a unique “Idle Stop & Smart Stick” function that automatically shuts down the engine when welding is interrupted. The engine can be restarted simply by tapping the base material twice with the welding rod. Not only does this reduce running costs by using less fuel, but it also helps cut CO₂ emissions. Stopping the engine also prolongs its life and helps lower maintenance costs.