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Miller™s New XMT 350 MPa Multiprocess Inverter Designed for Pulsed MIG in Portable Applications

For pulsed MIG welding in portable applications or when space savings and low weight are a prime consideration, Miller Electric Mfg. Co. has introduced its XMT 350 MPa multiprocess inverter featuring built-in pulsed MIG capabilities. It is the industry™s first welder specifically designed for pulsed MIG welding with voltage sensing feeders, such as Miller™s SuitCase X-TREME Series.

The XMT 350 MPa (MPa = MIG, Pulsed, advanced arc controls) simplifies the pulsed MIG process. It features built-in pulsing controls and advanced arc controls that enable the operator to control weld puddle fluidity, weld bead profile and arc length. The unit comes with programs for the welding wire types commonly used in the construction and maintenance of power plants, ships and boats, petrochemical plants and processing facilities: nickel, silicon bronze, copper nickel, 4000 and 5000 series aluminum, stainless steel, metal cored and mild steel.

If an operator knows how to MIG weld, he or she can pulsed MIG weld with the XMT 350 MPa, says Ken Stanzel, Miller product manager. The XMT 350 MPa automatically makes all pulsing adjustments. Operators control voltage and wire feed speed like they do with a regular MIG welder, and they can tailor the arc length to suit the application and their welding style.

The XMT 350 MPa weighs 80 lbs, provides a 5- to 425-amp output (350 amps at 60 percent duty cycle) and offers pulsed MIG, MIG, flux cored, Stick, DC TIG and air carbon arc gouging capabilities. Like the rest of the XMT 350 Series, it features Auto-Line power management technology, Wind Tunnel Technology and Fan-On-Demand.


Ground Breaking Technology
Previous generations of pulsed MIG technology (pulsing pendants and programmable feeders) required operators to adapt their welding preferences to meet technology limitations. Primarily, operators had to hold a longer-than desired arc length to prevent inadvertent arc outages, arc stumbling or wire stubbing. In addition, changing arc characteristics required complicated program adjustments.

The XMT 350 MPa eliminates these issues, using advanced technology to greatly simplify the pulsing process while enhancing operator appeal. For example, its SharpArc technology alters the width of the pulsed MIG welding arc cone. Using a lower SharpArc setting results in a wider arc cone that has greater wetting action, increased weld puddle fluidity and a flatter weld bead. A higher SharpArc setting narrows the arc cone, which produces a narrower, faster freezing weld bead with less heat input.

New technology also lets operators tailor the pulsed MIG arc length (voltage) to suit their needs. Typically, operators want a shorter arc to lower heat input, which is especially important when welding the highly alloyed metals found in power plants. Lower heat levels prevent carbide precipitation, a common cause of weld flaws, as well as dilution of the base metal and weld metal. Lower heat input also prevents burn-through on thinner metals and improves puddle control when welding out-of-position.

XMT 350 MPa technology enables operators to select a program and customize arc characteristics in less than 30 seconds using a three-position setup button, one control knob and two digital meters, notes Stanzel.


Feeder Versatility
Previously, pulsed MIG welding could only be achieved with a RC (Remote Control) wire feeder. However, the XMT 350 MPa allows end-users to pulsed MIG weld with a VS (voltage sensing) feeder where wire feed speeds are 200 IPM (inches per minute) or greater. The option of using a VS feeder eliminates an extra cable from the wire feed system and allows the operator to weld up to 150 ft. away from the power source (300 ft. round trip). For versatility, the XMT 350 MPa also connects to or any feeder with a 14-pin connection, such as Miller™s SuitCase RC feeders, 70 Series or 22A or 24A.

With headquarters in Appleton, Wis., Miller Electric Mfg. Co. is a leading worldwide manufacturer of Miller 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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