Profile: AOC Welding Supply offers welding gases and other compressed gases. We also pack & distribute chlorine, caustic soda, SO2 and anhydrous ammonia from railcars to cylinders, mainly to the water treatment industry. Our product categories are hardgoods and gases. Some of our hardgoods are welding machines, welding rods & wire, welding guns, abrasives, welding chemicals, flowmeters, regulators and torches.