To tell the truth ... does not reduce and reduce carbon arc air gouging effective method of noise and dust, the noise generated due to compression of high-speed movement of the gas, dust melted metal is compressed gas blowing formation. Can try the principles with reference to the resistive muffler for the noise generated by the high-speed gas, made of a porous material the shape of the radial shroud (the wanted satellite receiver that shape), the electrode is placed in the middle, and should be able to reduce the part of the noise and dust . Immature ideas need to be open to question, and I want you to help