Abstract: A plasma arc torch is of a two-part design and comprises two detachable and tightly joined parts mating with each other of which one part contains an electrode holder with an electrode, a nozzle disposed coaxially of said electrode and having means for supplying an electric current thereto. An insulator is located between said electrode holder and said nozzle, wherein there are also provided passages for the supply of plasma-generating gas and coolant, these being brought out onto the mating surface of the first part. The second part of the torch accommodates means for supplying an electric current to the electrode holder and means for supplying coolant and plasma-generating gas through passages brought out onto the mating surface of the second part so that they match with the corresponding passages of the first part on the surface of the joint thereof.