TIG Welder features high-speed pulsing capability.

Press Release Summary:

Adjustable from 0.1-5,000 pulses/sec, Maxstar 350 DC TIG/Stick Inverter delivers 5-350 A and features Auto-Line technology, which allows it to run from any input power, 208-575 v, single- or 3-phase. Users can control amount of time each pulse cycle spends at peak amperage from 5-95% of total cycle time and set background or low current pulsing from 5-99% of peak amperage. Welder is suited for metals where excess heat can lead to warping or degrading of metallurgical composition.

Original Press Release:

Miller's New Maxstar® 350 DC TIG Welder Features High Speed Pulsing Capability

APPLETON, Wis., March 27, 2007To improve DC TIG welding productivity and quality in industrial applications, Miller Electric Mfg. Co. has introduced its new Maxstar 350 DC TIG/Stick inverter. Compared to the previous model, the Maxstar 350 TIG welder offers high speed pulsing capabilities (now up to 5,000 pulses per second, a ten-fold improvement), 50 amps more welding power, Auto-Line power management technology and a more robust design.

The Maxstar 350 delivers 5 to 350 amp output (300 A at 32 V, 60 percent duty cycle), weighs 135.5 lbs and features Auto-Line technology, allowing it to run from any input power, 208 to 575 V, single- or three-phase.

A single, full-featured Maxstar 350 model replaced three previous models. An easier-to-understand front panel controls basic TIG welding functions, while a secondary menu controls additional setup parameters and values. The Maxstar 350 is available as a stand-alone unit, as a TIGRunner package featuring the Coolmate 3.5 cooler and a TIGRunner package with cooler and Weldcraft water-cooled torch.

Pulsing Improvements
The Maxstar 350 enables users to adjust the number of pulses per second (PPS) from 0.1 to 5,000 PPS, control the amount of time each pulse cycle spends at peak amperage from 5 to 95 percent of total cycle time and set the background or "low" current pulsing value to between 5 to 99 percent of peak amperage.

Pulsing in excess of 40 PPS increases weld puddle agitation to create a better-as-welded microstructure. Pulsing the weld current at 100 to 500 PPS also constricts and focuses the arc. This maximizes arc stability, increases penetration and increases travel speeds. Pulsed welding also lowers heat input and reduces the size of the heat affected zone (HAZ). Typical applications include stainless steel, nickel alloys and other metals where excess heat can lead to warping or degrading metallurgical composition (e.g., carbide precipitation).

In automation applications, which require maximum travel speeds, pulsing at frequencies beyond 500 PPS can further enhance arc stability and concentration.

Miller Electric Mfg. Co. is a leading worldwide manufacturer of Miller brand arc welding equipment and is a wholly owned subsidiary of Illinois Tool Works Inc. (NYSE: ITW).

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