METHOD AND DEVICE TO CLAD, OR HARD-FACE WITH MINIMIZING ADMIXTURE

摘要

An electric arc device and methods to build up, clad (2830), join, or overlay an alloyed metal onto a parent metal (2810) with minimal admixture (2820). The methods employed in the electric arc device provide a high frequency waveform with a high amplitude pulse, a low amplitude background current, and a special shorting routine, to alleviate the problem of generating too much ad-mixture. A fast transition from a peak current level to a background current level along with a shorting re¬ sponse and a plasma boost pulse reduces the droplet size and reduces the heat input required to achieve good welding performance.