Beeinflussung der Hartstoffverteilung beim Plasma‐Pulver‐Auftragschweißen

Abstract

Schlüsselworte: Plasma, Plasma-Pulver-Auftragschweißen, Hartstoffe, Hartstoffverteilung, modulierte Gasströmung A study was made to examine the possibilities of modification the distribution of reinforcing particles in plasma transfer arc welding by using pulsed gas flows. It is shown, how modulated gas flows can be created. The effects of different modulated plasma gas flows were analysed by measuring the pressure distribution in the arc. By using a two powder feeding system, a cobalt based hardfacing alloy with different amounts of tungsten carbides was deposited on plates of carbon steel. It was investigated, how variable pulsed gas flows affect the distribution of the reinforcing carbides. The metallographic analysis shows a uniform distribution of the tungsten carbide in contrast with specimens, welded with constant plasma gas flow.