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Brand: Miller
Miller Maxstar 280 Multiprocess DC TIG and Stick Welder, 280 A
Description
A 47 lb DC multiprocess inverter for pipe, petrochemical and site work
The Miller Maxstar 280 Multiprocess is a DC inverter power source for TIG (GTAW), pulsed TIG, stick (SMAW), air carbon arc and, with a voltage-sensing feeder, MIG and flux-cored welding. It covers 1 to 280 A DC, with a rated output of 200 A at 28 V and 60% duty cycle, and weighs 47 lb (21.3 kg). Miller lists shipbuilding, construction, rental, maintenance and repair, heavy fabrication, pipe and tube fabrication and petrochemical work as typical applications.
Auto-Line accepts 208 to 575 V single or three phase without manual linking. Because it is DC only, it suits steel, stainless steel and nickel alloys; aluminum that needs AC TIG calls for an AC/DC machine such as the Dynasty series. The unit is IP23 rated for outdoor use when sheltered from rain.
Technical specifications
| Parameter | Specification |
|---|---|
| Processes | DC TIG (GTAW), pulsed TIG, stick (SMAW), air carbon arc (CAC-A); MIG (GMAW) and flux-cored (FCAW) with a voltage-sensing feeder |
| Input power | 208-575 V, 1-phase or 3-phase, 50/60 Hz, Auto-Line |
| Amperage range | TIG 1-280 A; stick 5-280 A; MIG/flux-cored 5-280 A |
| Voltage range | 14-28 V (DC) |
| Rated output, 60% duty cycle | TIG 250 A at 20 V; stick 250 A at 30 V (3-phase), 180 A at 27.2 V (1-phase); MIG 250 A at 26.5 V (3-phase), 200 A at 24 V (1-phase) |
| TIG input current, 3-phase at 208/230/400/460/575 V | 21 / 19 / 11 / 9 / 7 A; 7.6 kVA, 7.3 kW |
| TIG input current, 1-phase at 208/230/400/460/575 V | 35 / 32 / 18 / 16 / 13 A; 7.3 kVA, 7.1 kW |
| Maximum open-circuit voltage | 60 VDC (11 VDC low-OCV sense voltage for stick and Lift-Arc TIG) |
| Pulse | Off to 250 pps; square, sine or triangular; QuietPulse |
| Stick controls | DIG off to 100%, Hot Start adaptive, Stick-Stuck detection |
| MIG controls | Voltage 14-28 V; arc control 0-99%; wire feed 50-780 ipm with feeder |
| Dimensions (H x W x D) | 13.6 x 8.6 x 22.5 in. (346 x 219 x 569 mm) |
| Net weight | 47 lb (21.3 kg) |
| Environment | IP23; operating -10 to 40 C; storage -30 to 65 C |
| Generator requirement | 12.5 kW for the performance rows quoted by Miller |
| Warranty printed | Power source three years, parts and labor |
Duty cycle performance and wire feeder options
With 380 to 575 V supply Miller lists TIG at 280 A, 40%; 250 A, 60%; and 200 A, 100%, and stick and MIG at 280 A, 35%, with the same 250 A and 200 A steps. On 208 to 240 V the figures fall to 280 A, 40% in TIG, 280 A, 15% in stick and 280 A, 20% in MIG, with 100% duty at 200 A for TIG, 145 A for stick and 160 A for MIG. TIG thickness range is 0.004 to 3/8 in. (0.1 to 9.5 mm); stick is quoted to 6010 at 1/4 in., 7018 at 7/32 in. and 7024 at 3/16 in.
The ArcReach SuitCase 8 (330 A, 60%) and SuitCase 12 (425 A, 60%) run from arc voltage of 14 to 48 VDC with wire feed 50 to 780 ipm, solid wire .023 to .052 in. and flux-cored .030 to 5/64 in. Printed numbers: SuitCase 8 with Bernard BTB gun 951726001; SuitCase 12 with BTB gun 951729001, or with Dura-Flux gun 951731.
Ordering and what to confirm before ordering
The power source is stock number 907552001, Auto-Line 208-575 V, 50/60 Hz, with Tweco-style connectors. Accessories printed in the sheet include the 2-wheel trolley cart 300971, wireless foot control 301580 and hand control 301582, RCC-14 fingertip control 151086, RCCS-14 043688, RMS-14 187208, RHC-14 242211020, the Weldcraft A-250 TIG torch 301525025 (no valve) or 301526025 (with valve), and the QuietPulse memory card 301790 for machines built before serial number ND040985L.
Confirm the supply, the connector style, the torch and remote, and whether a wire feeder and gun are needed. Duty cycles on 208 to 240 V supplies are lower than on 380 to 575 V, so state the site voltage when requesting a quotation. Browse all Multi-Process Welding Machines.
See also: Miller Deltaweld 500 Industrial MIG Welding Power Source; Miller XMT 400 ArcReach Multiprocess Welding Power Source; Miller XMT 650 CC/CV Multiprocess Welding Power Source.
Datasheets & Documents
- Datasheet Miller Maxstar 280 Multiprocess spec sheet, Index No. DC/35.5 (June 2023) Download
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About brand
Miller Electric is the American maker of arc welding and cutting equipment: TIG, stick and multiprocess power sources, engine-driven welders, plasma cutters, induction heating systems, guns and welding helmets. Niels Miller built his first arc welder in his home in Appleton, Wisconsin, in 1929. The company, still headquartered in Appleton, has been part of Illinois Tool Works (ITW) since 1993 and sits in ITW's welding segment.
Seven Star LLC sources and supplies Miller welding power sources, engine-driven welders, induction heating systems, MIG guns and auto-darkening helmets for fabricators and contractors in Oman, and checks each model and its input power configuration against the manufacturer's documentation before quoting.
Miller company profile
| Founded | 1929, Appleton, Wisconsin, USA, by Niels Miller |
|---|---|
| Incorporated | 1935, as Miller Electric Mfg. Co. |
| Ownership | Illinois Tool Works (NYSE: ITW) since 1993; part of ITW's welding segment |
| Headquarters | Appleton, Wisconsin, USA |
| Product families | Dynasty and Maxstar TIG inverters, XMT and PipeWorx multiprocess systems, Millermatic MIG welders, Trailblazer and Big Blue engine drives, Spectrum plasma cutters, ProHeat induction heating, MIG guns and Digital Infinity helmets |
Milestones
- 1929: Niels Miller starts building arc welders at his home in Appleton.
- 1935: The business is incorporated as Miller Electric Mfg. Co.
- 1971: The Millermatic combines power source and wire feeder in one unit, bringing MIG welding to a wider market.
- 1993: Illinois Tool Works acquires Miller Electric.
Miller product families listed here
Miller welding machines on this page cover most processes used in plant construction and maintenance:
- TIG and stick: Dynasty 400 AC/DC and Maxstar 210 STR
- Multiprocess: XMT 400 ArcReach, XMT 650 and the PipeWorx 400 pipe welding system
- Engine-driven welders: Trailblazer 330 and Big Blue 800 Duo Pro
- Induction heating: ProHeat 35
- Guns and helmets: XR-Aluma-Pro push-pull gun; T94, Classic, Digital Performance, Digital Elite and Digital Infinity helmets
Where Miller equipment is used
An XMT or PipeWorx set suits pipe spools and structural work where one power source must run stick, TIG, MIG and flux-cored procedures. Dynasty machines handle aluminum and stainless TIG. Trailblazer and Big Blue engine drives go where no mains supply exists, such as pipelines, tank erection and remote maintenance in the GCC. The ProHeat 35 is used for preheat and post-weld heat treatment of pipe joints.
Miller products we list
Ordering Miller machines and parts: what we need
State the model and the Miller part number of the exact package, because the same machine is sold in several configurations. Give the supply at your site (voltage, phase and 50 Hz), the process and maximum current, and the accessories needed: wire feeder, remote control, cable length, torch or gun, cooler, running gear. For spare parts, the serial number from the rating label is essential, since Miller parts lists are issued by serial number range. For helmets, name the series and lens type.
Facts checked against published histories of Miller Electric and ITW, October 2026.
FAQ
Questions about the Miller Maxstar 280 Multiprocess DC TIG and Stick
Answers from our engineering team on installation, compatibility and integration.
01What is the Maxstar 280 output range?
1 to 280 A DC in TIG and 5 to 280 A in stick and MIG, with 14 to 28 V in MIG.
02What input does it accept?
208 to 575 V, single or three phase, 50/60 Hz, connected by Auto-Line.
03Can it TIG aluminum?
No. It is DC only; AC TIG needs an AC/DC machine such as the Dynasty series.
04Can it run MIG?
Yes, with an ArcReach SuitCase 8 or 12 or another voltage-sensing feeder; it does not support ArcReach control.
05How heavy is it?
The power source weighs 47 lb (21.3 kg) net.
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