Multiprocess Inverter utilizes Auto-Line(TM) technology.

Press Release Summary:

Weighing 80 lb, XMT® 350 CC/CV inverter is designed for those who regularly perform Stick, TIG, pulsed TIG, MIG, pulsed MIG, flux cored, or air carbon arc cutting and gouging. It features Auto-Line(TM) primary power management technology, 5-425 A output, and duty cycle rating of 60% @ 350 A/34 V. Product has single selector switch for process selection, adjustable dig and inductance control, Wind Tunnel Technology(TM), and Fan-on-Demand(TM).

Original Press Release:

New XMT® 350 CC/CV Inverter from Miller Electric Offers More Welding Output, Better Productivity

o Exclusive Auto-Line(TM) technology enhances arc performance

APPLETON, Wis., April 6, 2004-To improve productivity, flexibility and weld quality, Miller Electric Mfg. Co. has introduced its new XMT® 350 CC/CV multiprocess inverter. The XMT 350 features Auto-Line(TM) primary power management technology, a 5 to 425 amp output and a duty cycle rating of 60 percent at 350 amps/34 volts. It weighs 80 lbs.

Compared to the ALT 304, which it replaces, "The new XMT 350 offers 24 percent more power, and that puts more parts in the bucket at the end of the day," says Jim Rappl, product manager, Miller Electric. "For example, the XMT 350 improves deposition rates up to 27 percent when running a .045-in. tubular wire, and it permits running longer secondary weld cables when wire welding on construction sites." The increased output voltage of the XMT-350 to 38 volts, enables more headroom for voltage drops across longer secondary weld cables and at the same time deliver the desired welding voltage to the arc.

The XMT 350 CC/CV is specifically designed for fabrication, manufacturing, construction, and maintenance and repair personnel who regularly perform Stick, TIG, pulsed TIG, MIG, pulsed MIG, flux cored or air carbon arc cutting and gouging. It also has an excellent low-end MIG arc for short circuit welding thin material, especially stainless steel.

The XMT 350 maintains all the benefits end-users expect from an XMT inverter: unmatched reliability, a single selector switch to simplify process selection, adjustable dig and inductance control, Wind Tunnel Technology(TM) and Fan-on-Demand(TM) for superior reliability and quiet operation. The XMT Series also includes the XMT 304 (duty cycle rating of 60 percent at 300 amps/32 volts) and the XMT 456 (duty cycle rating of 60 percent at 565 amps/43 volts). However, only the XMT 350 features Auto-Line technology.

Auto-Line Exclusive

Miller's unique Auto-Line technology provides three key benefits that improve performance: the ability to maintain a rock-steady arc despite primary power fluctuations within a 190 to 630V range; a primary power draw of just 17.8 amps at rated output on 460 VAC primary, which is a 25 percent advantage over competitive inverters; and the flexibility to accept any type of primary power (190 to 630V, single- or three-phase, 50 or 60 Hz) without any physical linking mechanisms.

Rappl says that, "whether they're aware of it or not, many companies have a problem with dirty power. This can cause welding parameters to go out of specification, nuisance trips or problems with re-linking mechanisms." Dirty power is the result of large loads starting on the same primary power line, utility brownouts or spikes, and generators that do not regulate auxiliary power voltage.

Auto-Line technology uses a "boost converter." This circuit boosts the primary input power-whether it's 208, 220, 240, 460, 575 V or anything in between-to a higher voltage. After being regulated, this power then becomes the source voltage for the actual inverter section of the power source (see Fig. 1). This ensures that the inverter has sufficient power as long as the primary power remains within a +37/-59 percent of the nominal 460V power.

Kurt Wollenberg, vice president of Performance Welding, a fabricator in Freedom, Wis., says, "The XMT 350 with Auto-Line technology definitely performs as advertised. It rode through voltage drops that shut down two other inverters on the same line (see Fig. 2)." In one instance, a tree fell across a power line and caused a sudden drop in voltage. In another, dirty power from the utility created a low voltage situation that exceed the standard ±15 percent operating window of non-Auto-Line inverters, causing them to shutdown for self-protection.

The Auto-Line circuitry also lowers primary power draw, which results in a near perfect power factor of .95 (1.0 is perfect). Drawing only 17.8 amps on 460V/three-phase primary, the XMT 350 permits using smaller fuses/breakers, smaller primary wiring and adding more welders to a facility without altering incoming service. Rappl adds, "The XMT 350's ability to run on one-fourth less current is also important on construction sites, which are usually starved for power."

The XMT 350 provides exceptional electrical efficiency, surpassing even the XMT 304 when welding at 250 amps and up. At 400 amps, the electrical efficiency is 87.24 percent. "With the XMT 350, fabricators and manufacturers can see significant cost savings by reducing power consumption," Rappl says.

The XMT 350 is covered by Miller's True-Blue® three-year warranty. To download an XMT 350 spec sheet, visit Miller's Web site at For more information or the name of the Miller distributor nearest you, call 800-4-A-MILLER (800-426-4553), e-mail, fax 877-327-8132, visit the Web site or write to Miller Electric Mfg. Co., P.O. Box 100, Lithonia, Ga., 30058.

With headquarters in Appleton, Wis., Miller Electric Mfg. Co. is a leading worldwide manufacturer of Miller and Hobart brand arc welding equipment and related systems for metalworking, construction, maintenance and other applications. Miller Electric is a wholly owned subsidiary of Illinois Tool Works Inc. (ITW), Glenview, Ill. ITW is a diversified multinational manufacturer of highly engineered components, assemblies and systems.

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