January 15, 2008
Miller Electric Mfg. Co. has introduced the new Invision 350 MPa GMAW/pulsed GMAW inverter. It is designed to help solve distortion, burn-through, and spatter issues commonly associated with welding light-gauge material.
The inverter works in combination with the S-74 MPa wire feeder, so that adjustment of the wire feed speed also adjusts total power output. One-knob control frees the operator from setting multiple parameters and nearly eliminates the pulsed-GMAW learning curve for experienced GMAW operators.
The inverter provides a 5- to 425-amp output (350 amps at 60 percent duty cycle). It can operate off any input voltage from 208 to 575 V, single- or three-phase, and provide constant output even if input voltage varies by plusmn; 10 percent.
SharpArc technology alters the width of the pulsed GMAW arc cone. A lower SharpArc setting makes the arc cone wider and gives it greater wetting action, increased weld puddle fluidity, and a flatter weld bead. A higher 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 GMAW arc length (voltage) to suit their needs. Typically, operators want a shorter arc to lower heat input, which is especially important when welding thin-gauge material.