The Miller Big Blue 400D (often represented by the heavy-duty 400 Pro/PipePro variants) is a rugged, low-speed diesel engine-driven welder and generator. Designed primarily for field applications like pipeline, structural steel, and MRO, it delivers up to 400 amps of welding power at a 100% duty cycle while serving as a reliable 12 kW auxiliary power source.

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2012 MILLER BIG BLUE 400D

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