Welding apparatus

摘要

A welding apparatus is provided with an electrode die portion (3) having a lower base portion (1) and an upper base portion (2) at least one of which is driven to ascend and descend to freely close to and part from each other, plural lower electrode portions (5) attached to the lower base portion (1), and plural upper electrode portions (6) attached to the upper base portion (2) having vertical welding electrode pressurizing cylinder guns (13) which are supplied with cooling water in unpressurized state and pressed to a welded object (w) placed on the lower electrode portions (5) to weld in pressurized state, comprising a construction in which the Yielding electrode pressurizing cylinder gun (13) is provided with a main body portion (27), a piston rod portion (28) inserted to the main body portion (27) as to freely slide, an extension rod portion (29) detachably attached to an end of the piston rod portion (28) protruding from the main body portion (27), and a tip electrode portion (30) attached to an end of the extension rod portion (29).