Miller Millermatic 355 – MIG/Pulsed MIG Welder (208/240/460/575V)

The Miller Millermatic 355 MIG/Pulsed MIG Welder is a powerful, easy-to-use solution built for manufacturing, fabrication, and professional welding applications. Featuring a 7-inch color LCD screen with Auto-Set Elite technology, Trigger Program Select, and an Electronic Parameter Chart, this all-in-one welder increases efficiency, reduces setup time, and ensures consistent weld quality.

Weighing only 99 lbs, the Millermatic 355 is more than 40% lighter than comparable models, making it portable enough for shop, field, or mobile applications. Compatible with any North American input power (208/240/460/575V, single- or three-phase), this versatile machine delivers exceptional weld performance on aluminum, stainless steel, and mild steel up to 1/2 inch thick.

Key Features & Benefits

• Easy-to-Use Interface – 7" color LCD display simplifies setup and parameter selection, boosting productivity.

• Pulsed MIG Welding – Reduces heat input for less distortion on thin materials, decreases spatter, and minimizes post-weld grinding and rework.

• Trigger Program Select – Switch between saved weld settings directly at the gun for maximum efficiency.

• Versatile Welding Capabilities – MIG, Pulsed MIG, and Flux-Cored welding in one machine.

• Bernard BTB 300A MIG Gun with AccuLock™ S Consumables – Provides flawless wire feeding, superior arc performance, and ergonomic comfort to reduce welder fatigue.

• Portability – At just 99 lbs, this machine is easy to move, with optional EZ-Latch™ running gear for secure transport and quick dismounting.

• Generator Compatible – Full output when powered by 19,000-watt generators or larger.

• Locks & Limits Function – Controls weld parameter ranges to ensure WPS compliance.

• USB Port – Update software, back up settings, or transfer weld programs between units.

• Auto-Set™ Elite – Predefined weld settings help operators of all skill levels achieve consistent, high-quality welds.

What’s Included

• Millermatic® 355 power source with 9 ft (2.7 m) industrial power cord

• 15 ft (4.5 m) 300A Bernard BTB MIG gun with AccuLock™ S consumables (.035"/.045" wire)

• 10 ft (3 m) work cable with clamp and 50 mm Dinse-style connector

• Flow gauge regulator and gas hose (Argon or Ar/CO2 mix)

• Reversible drive rolls (.035"/.045")

• Extra .035" and .045" contact tips

• Material thickness gauge

Applications

• Manufacturing & Industrial Fabrication

• Construction & Structural Steel Work

• Transportation & Automotive Repair

• Welding Education & Training

• Mobile Fabrication & MRO

Specifications

• Processes: MIG (GMAW), Pulsed MIG (GMAW-P), Flux-Cored (FCAW)

• Amperage Range: 20 – 400 A

• Material Thickness Capacity: Aluminum 18 ga. – 1/2" | Mild Steel 22 ga. – 1/2" | Stainless 22 ga. – 1/2"

• Rated Output: 310 A at 29.5 V, 60% duty cycle

• Open Circuit Voltage: 90 VDC

• Wire Feed Speed: 50–800 IPM (1.3–20 m/min)

• Wire Diameter Capacity: .023"–.052" (depending on material type)

• Spool Size: 12 in (305 mm)

• Weight: 99 lbs

• Dimensions: 26.25" L x 13.75" W x 19.25" H

• Input Power: 208/240/460/575V (single- and three-phase)

• Warranty: 3-Year Miller True Blue® Warranty

Why Choose the Millermatic 355?

With advanced pulsed MIG capabilities, an intuitive LCD interface, and compatibility with any North American power input, the Millermatic 355 is built to maximize productivity while ensuring consistent, high-quality welds. From fabrication shops to jobsite welding, this machine combines portability, precision, and reliability—backed by Miller’s True Blue Warranty.