Weld ocean-going hulls and hatches together on massive ships.
Operates dust-collecting equipment in crushing department of copper refinery to recover dust from ore: Starts feed conveyors, suction fans, impellers, and electrodes, and moves controls to regulate dampers, equalizing ports, and water eliminators. Turns valves to fill and maintain level of water in tanks. Observes operation of equipment and filling of collected dust in hoppers to ensure efficient operation. Inspects and cleans water eliminators, impellers, hopper walls, air chambers, fan housings and wheels, safety switches, and water-level control devices, using water and airhose. Removes and cleans strainers in waterlines. Adjusts and tightens belts on motors or pulley wheels to maintain tension, using handtools. Lubricates motors and exhaust bearings.