Profile: Metroplex Service Welding Supply, Inc. is a supplier of welding and shape cutting needs. Our products are used in small fabricators to major steel service centers. We provide arc welding and cutting equipment. PRO 300 CC/CV is a low speed, compact diesel welder ideal for professional welders. Our industrial pure gases include oxygen, nitrogen, argon, helium, compressed air, hydrogen, acetylene, carbon dioxide, and propane.