XA-Ox Welding Supply Co. Inc.A-OX Welding is a South Dakota based independent welding supply and gas distributor. A-OX has locations in Sioux Falls, Watertown, Huron, Mitchell, Yankton, Sioux City, and Fargo. A-OX offers a wide variety of services from packaged gas for welding applications to medical grade oxygen for breathing application. A-OX has an extensive line of hard goods to cover your welding needs.  A-OX also provides cryogenics solutions for manufactures and hospitals in need of large volumes or a continuous supply of gas.