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August F. Manz G us Manz is known for his many contributions to welding. He holds more than 30 U.S. patents on power supplies and other welding subjects. He has worked on all of the arc welding systems and is the inventor of the "hot wire" welding processes. Hot wire welding is a variation of fusion welding in which a filler metal wire is resistance heated by current flowing through the wire as it is fed into the weld pool. He was an employee of Union Carbide Coporation's Linde Division at the time of the invention. Manz also holds patents for One Knob Welding, which uses a coupled power source and wire feeding via a single control, and Variable Slop, Voltage and Inductance (SVI) power Supply, which provides separate static and dynamic adjustment for voltampere characteristics for short circuit metal transfer. He authored or co-authored 20 books on welding, including The Welding Power Handbook and Welding Process and Practices. In 1991, he received the Airco Welding Award for the original and innovative use of welding related techniques for the joining of severing of metals in the fabrication of new products.