Abstract: A nozzle for a welding gun for shielded arc welding comprises a cooling fluid section and a gas nozzle assembly structured to optimize the cooling and thermal protection of the component parts of the gas nozzle assembly from melting or other damage resulting from exposure to extremely high temperatures in connection with performing a shielded arc welding process in a confined space having limited heat dissipating capability. The cooling fluid section has inlet and outlet passageway portions including changes in heat transfer surface areas, and a heat sink and insulating section is provided between the cooling fluid section and the gas nozzle assembly. The gas nozzle assembly includes a sleeve of thermosetting silicone material to optimize transfer of heat from the gas diffuser and shroud components thereof to the heat sink and insulating section.

Abstract: An electrode gun and cable for feeding a welding electrode and shielding gas to a workpiece having an improved arrangement for supplying the gas to the arc and for electrifying the electrode in the contact tip. The cable is designed to resist abuse and purge air entering with the electrode. The gun nozzle has a square passage to receive the electrode guide and provide unobstructed gas passages. The trigger has a flexible member engaging the on-off switch to prevent damage thereto from too much pressure by the operator.