Abstract: An arc blade-shaped processing surface structure of a pad conditioner includes an outer frame, a combining layer and a plurality of polishing particles. The polishing particles are disposed on a surface of the combining layer, and the combining layer has a first region and a second region sequentially arrange from the center to the outside of the combining layer, and the second region has a plurality of arc-shaped protrusions arranged separately from one another and disposed around the external periphery of the first region, and the protrusions arranged in order and separated with an interval apart from each other can be used to provide an appropriate space for extension and rebound for a polished surface material to obtain a definite and uniform polishing effect.

Abstract: An arc blade-shaped processing surface structure of a pad conditioner includes an outer frame, a combining layer and a plurality of polishing particles. The polishing particles are disposed on a surface of the combining layer, and the combining layer has a first region and a second region sequentially arrange from the center to the outside of the combining layer, and the second region has a plurality of arc-shaped protrusions arranged separately from one another and disposed around the external periphery of the first region, and the protrusions arranged in order and separated with an interval apart from each other can be used to provide an appropriate space for extension and rebound for a polished surface material to obtain a definite and uniform polishing effect.

Abstract: A plasma welding and cutting gun for discharging plasma gas with constant outlet pressure includes a gun body having a negative-electrode jacket for directing welding and cutting gas into the gun, a core tube through which the gas flows through a gas outlet of the negative-electrode jacket disposed around the core tube and then discharged through a nozzle secured to a lower portion of the gun body, and a positive-electrode sleeve secured to an outer portion of the gun body and connected to the nozzle, wherein the nozzle serves as a positive-electrode terminal and the gas directed into a passage between the nozzle and a negative-electrode terminal secured to a lower portion of the negative-electrode jacket will be ionized by an arc formed between the nozzle and the negative-electrode terminal, and then discharged through the nozzle to form plasma arc of high temperature and high velocity for welding and cutting a work piece, and wherein an over-pressure relief valve is provided between the core tube and negati