Abstract: A plasma arc torch includes an electrode device with an elongated electrode carrier which has a first end mounted rotatably in a housing and an opposite second end extending outwardly of the housing and mounted with an electrode body. A drive unit is mounted in the housing, and is connected operably to the electrode carrier for driving axial rotation of the electrode carrier. A nozzle, which confines a gas chamber, is mounted on the housing and is disposed adjacent to the electrode body. A gas guiding unit is provided for guiding plasma gas into the nozzle.

Abstract: A nail pack includes a preset number of T-shaped separate nails, which respectively formed with a sloping insert portion at a lower end of the head. The sloping insert portion has one end formed with a sharp pointed portion of a preset acute angle, and the sharp pointed portion may sink in an upper one of two works to be united by a nail so as to strengthen effectively the tightly uniting force of the nail with the two works. Then the two works are united with better strength more stably.