Patent ID: 6373020
Filing Date: 2002-04-16
Classification: B23K

Abstract:
A welding apparatus provided with an electrode die portion having a lower base portion and an upper base portion at least one of which is driven to ascend and descend to freely close to and part from the other base portion, with a lower electrode portion attached to the lower base portion and an upper electrode portion attached to the upper base portion having a welding electrode pressurizing cylinder gun which is supplied with cooling water in an unpressurized state and which is pressed to a welded object placed on the lower electrode portion to weld in a pressurized state, and having a cooling water circulation duct which circulates and supplies cooling water to the cylinder gun, comprising a construction in which:a check valve is disposed on an upstream side directly communicating with the cylinder gun in the cooling water circulation duct; a booster is disposed on a downstream side directly communicating with the cylinder gun in the cooling water circulation duct; and wherein the check valve is closed and the cylinder gun is extended and pressed to the welding object to weld by pressurizing the cooling water in the cooling water circulation duct directly from the booster and directly to the check valve through the cylinder gun with the booster.