There is provided a welding helmet having a protective shield and a welding visor. The welding visor is detachably attachable to the protective shield by means of a bayonet coupling. The bayonet coupling has a first bayonet part and a second bayonet part. The first bayonet part is rotatably connected to the welding visor for a rotation between a release position, in which the bayonet coupling is disengaged, and an engage position, in which a disengagement of the bayonet coupling is disabled. The bayonet coupling further forms a pivot for pivoting the welding visor relative to the protective shield between a welding position, in which the welding visor covers the see-through window, and a non-welding position, in which the welding visor uncovers the see-through window. A locking member is provided that is switchable between a locked position and an unlocked position.