IRVING, Texas--(BUSINESS WIRE)--MATHESON has continued its strategic expansion with the acquisition of Weld Specialty Gas & Equipment, Inc., Milwaukee, Wisconsin. Weld Specialty Gas & Equipment was founded in 1980 and is a well-established supplier of industrial, specialty, and bulk gases, plus welding hard goods, equipment, and safety products. Headquartered in Milwaukee, Weld Specialty operates out of four locations in the Southeast region of Wisconsin. Steve Foster, Executive Vice Pr