The newly developed, robust and ergonomically designed PH-4L stud welding gun is especially suitable for larger stud diameters from 12 mm onwards, welded in series production at high continuous welding sequences under hardest conditions and requirements. A new type of manual oil damping system regulates the plunging speed which is absolutely necessary when stud diameters of >= 12 mm are applied. Together with easy and practical operation, the PH-4L stud welding gun offers a maximum of technical performance features for the production of high quality stud welded joints.