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Experience the Freedom of Auto-Line

Auto-Line™ Power Management Technology puts you in control of the primary power.

Now, primary power management begins at the plug and ends in your wallet.

  • Better Weld Quality, Uninterrupted Production
    Rock steady arc even during fluctuations in primary power.

Auto-Line Power Management Technology

The Auto-Line circuit boosts primary power to a higher, constant voltage. Even if incoming voltage varies widely, the circuit ensures a rock-steady welding or cutting arc.

  • Universal Location Flexibility
    Permits direct connection to almost any type of input power—115-575 VAC (varies by product), 1- or 3-phase, 50 or 60 Hz.
  • Draws Fewer Amps
    Permits more welding machines without boosting incoming service.
  • Exceptional Electrical Efficiency
    Helps your welding machine pay for itself through lower utility bills and potential for rebates.
  • More Welding Output on 115V Primary
    You get the max output for a given primary current draw. As a result, machines like the Maxstar 150 can produce 30% more welding power than competitive welders on 115 V primary.

NOTE: The input voltage range may be different for each product. Refer to the product Spec Sheet for the specific input voltage range.


View Auto-Line Video

View Auto-Line Brochure (PDF)


Auto-Line Technology Q & A:

Q: What is dirty power?
A: Fabricators, contractors and manufacturers often fight weld quality and maintenance problems that result from primary voltage fluctuations, or "dirty power." Dirty power is the result of unreliable primary power - large motors starting on the same primary power line, utility brownouts or spikes, and generators that do not regulate auxiliary power voltage.
Q: How does dirty power affect weld quality?
A: A power surge or dip can cause your arc to flicker and your inverters to shut down for self protection. In some cases, you might not even know you experienced dirty power until the QA/QC department rejects your weld because it doesn't pass inspection.
Q: What can I do to protect my work from dirty power?
A: Miller has developed its exclusive technology that frees operators from primary power limitations and allows uninterrupted production. Auto-Line is featured in Miller's Axcess Series of multi-MIG inverters; TIG inverters such as the Maxstar 150 and 200 Series and Dynasty 200; multi-process inverters such as the new XMT 350 CC/CV; and plasma cutters such as the Spectrum 2050.
Q: How does Auto-Line work?
A: Auto-Line technology uses what's known as "boost converter." This circuit boosts primary input power - from 190 through 630V or anywhere in between - to a higher voltage. This voltage then charges a capacitor, which is a device used to store and quickly discharge energy. Power for the actual inverter section of the welder comes from this capacitor. The inverter, therefore, has sufficient power as long as the primary power remains within a +37/-59 percent of the nominal 460V power. In short, it's like drawing water from a well that's always full.
Q: What does Auto-Line do for weld quality?
A: Auto-Line ensures that you always draw welding or cutting power from a regulated, stable voltage source within the machine, which lets you ride effortlessly through dirty power. Auto-Line gives you a rock-steady arc, "on spec" welding parameters and equipment with an incredibly dynamic, link-free operating range.
Q: What is the difference between Auto-Line and Auto-Link®?
A: They're both examples of great technology from Miller. Auto-Line automatically and continuously adjusts for voltage surges and drops, providing a constant, steady arc and ensuring quality welds. Auto-Line does this regardless of input voltage, provided it is within the operating range of the equipment being used. Auto-Link "links" power, switching transistors for either 230 or 460V primary power only.

How do I know if an Auto-Line equipped inverter fits my needs?

A: Auto-Line is for anybody who can't afford re-work. And Auto-Line also gives you the flexibility to use the same machine in the shop and in the field because it smoothes out power fluctuations anywhere.
Q: Which Miller welders and cutters have Auto-Line technology?

The number of Miller machines that utilize Auto-Line continues to grow. Below is a current listing:

TIG/Stick Welders:
Diversion 180
Maxstar 150 STH

Maxstar 150 STL

Maxstar 200 Series
Maxstar 350
Masxstar 700

Dynasty 200 Series
Dynasty 350
Dynasty 700

Stick Welders:
Maxstar 150 S

Multiprocess Welders:
XMT 350
PipePro Welding System

Plasma Cutters:
Spectrum 375 X-TREME
Spectrum 875 Auto-Line

Multi-MIG Systems:
Auto-Axcess Series

Three-Phase MIG:
Invision 352 MPa
XMT 350 MPa
AlumaPower 350 MPa

All-in-One MIG Welders:
Millermatic Passport Plus