Miller Thunderbolt 225 AC Arc Welding Machine

Updated October 18, 2026

Description: A classic, highly dependable industrial shop asset featuring a Miller Thunderbolt 225 A.C. Arc Welding Machine (Style U-6-A-2). The heavy steel welder cabinet is mounted on a small custom wooden caster dolly with four swivel wheels for easy shop mobility. This lot comes outfitted with generous lengths of heavy-gauge cabling visible in the photographs, including: Welding Leads: Includes a long, heavy-duty electrode stick holder lead (stinger) and a matching ground clamp cable assembly coiled neatly on top of the machine unit. Power Cord: Integrated high-amperage 230V heavy industrial power cable with a molded 3-prong plug attached. Control Interface: Features a manual front-facing current increase selector crank, High/Low range tap selectors, a heavy-duty toggle power switch, and a clear red indicator needle window. Manufacturer Technical Specs (From Faceplate): Brand: Miller Electric Mfg. Co. (Appleton, WIS., U.S.A.) Model/Style: Thunderbolt 225 (Style U-6-A-2) Primary Input: 230 Volts, 45.5 Amps, 7.2 K.W., 60 CY (Hz), Single Phase Secondary Output (Max Rated): 30 Volts (High Range) / 25 Volts (Low Range), 200 Amps / 225 Amps Duty Cycle: 20% Condition: Used. Physically intact and complete with solid cable connections. The cabinet and faceplate show minor expected surface cosmetic wear, superficial scratches, and shop dust from storage, but the core structural shell is solid. Inspection Note: This is an online-only auction with absolutely no public preview or physical inspection available prior to bidding. By placing a bid, the bidder explicitly accepts the digital photographs and descriptions provided as the sole and sufficient basis for their purchase.

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