The torch also includes a shield attached to the torch body.

The torch includes an adapter (22) connectable to a torch body (20) and remote torch head (42), establishing a spaced relationship between them, for positioning the torch head adjacent the workpiece in the cavity.

The back adapter (40) is fitable in a gooseneck or body block of the welding torch.

The torch body further comprises an anode (12) and a cathode base (30) and terminates at a threaded connection point.

The flow of gas may be directed around and/or along the body of the plasma arc torch with an air curtain attachment.

The apparatus includes a reactor body disposed to maintain laminar flow of gases with the torch body and coupled to a quenching body where temperature and residence time is controlled.

The shield (38) is electrically insulated, preferably by mounting it on an insulating ring (22) that is itself secured on a cap (20) screwed onto the torch body (12).

The shield is electrically insulated, preferably by mounting it on an insulating ring (22) that is itself secured on a cap (20) screwed onto the torch body.

The torch body includes a plasma gas flow path for directing a plasma gas from a plasma gas inlet to a plasma chamber in which a plasma arc is formed.