Aircraft Welding & Repair

The synthetic AC output of the inverter allows the operator to further control the bead profile and effects of the arc by setting the EN and EP amperage independently. This independent AC amperage control enhances the effect of AC balance control and can be used to fine tune arc etching and reduce the tungsten size required for some applications. While the base metal may require a certain amount of time in EP for adequate cleaning, it may not require the full amperage of the output settings.

AC waveshaping options found in modern inverters further optimize arc characteristics. Depending on the waveform selected — advanced squarewave, soft squarewave, sine wave, and triangular wave — users can tailor the arc for such characteristics as a hard, driving arc, a smooth, soft arc with good puddle control and wetting action, or a punch of peak amperage with minimized overall heat input to reduce distortion.

Summary

New inverter technology has elevated its capabilities to give aircraft welders more control over the entire welding process. Precise arc starts and refined arc controls contribute to weld quality and help to reduce weld costs and eliminate scrap. In addition, inverter power source designs are smaller and lighter weight — so they take up less space in the work cell and are easier to move around. They also account for a much more efficient power draw than older systems. As quality requirements and standards become more stringent in the interest of safety and reliability, TIG inverters present a compelling case for those who perform aircraft welding and repair. AMT

Brent Williams is a product manager with Miller Electric Mfg. Co. For more information visit www.MillerWelds.com.