907711 - Miller Maxstar 161 STH DC TIG/Stick Welder Standard Package

Technical Overview of the Miller Maxstar 161 STH

The Miller Maxstar 161 STH (SKU: 907711) is a compact, inverter-based DC TIG and Stick welding power source designed for high-performance industrial applications requiring portability and versatility. Engineered with Miller's proprietary Auto-Line™ technology, this unit automatically adapts to input voltages ranging from 120V to 240V, single-phase, 50/60 Hz, without the need for manual linking or tool-based reconfiguration. This capability ensures consistent arc performance even on dirty or unreliable power grids.

The machine delivers a welding output range of 5 to 160 Amps, with a rated output of 160 A at 26.4 VDC (20% duty cycle) when operating on 240V power. A key technical differentiator for the STH model is its built-in DC Pulsed TIG capability, adjustable from 0 to 150 pulses per second (Hz). This feature significantly enhances puddle agitation, arc stability, and travel speeds while minimizing heat input and distortion, making it critical for welding thin stainless steel and other heat-sensitive materials. The unit also features High-Frequency (HF) arc starting for non-contact ignition to prevent tungsten contamination, as well as Lift-Arc™ starting for environments where HF interference is a concern.

For Stick (SMAW) welding, the Maxstar 161 STH is optimized for difficult-to-run electrodes, including E6010. It incorporates Adaptive Hot Start™ technology to prevent electrode sticking during ignition and a "Stick-Stuck" safety feature that cuts welding output if the electrode fuses to the workpiece. The Pro-Set™ feature eliminates parameter guesswork by offering factory-preset controls for speed and convenience. Thermal overload protection and Fan-On-Demand™ cooling ensure the longevity of internal components by managing operating temperatures and reducing the intake of airborne contaminants.