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CURRENT LOAD OF TUNGSTEN ELECTRODES

Welding current: AC 50 Hz Gas: Argon 12 l/min. Parent mat.: AIMg 2.5

Slope up: 0Slope down: 4 secs.Electrode point: 70

°

ACt: 65% -Electrode dia.: 2.4 mmElec. dist. to workpiece: 3 mm

Type of electrode Comments Blue: WL 20 2% Lanthan oxide The point forms a small, shiny ball at 150 amp.A ball with dia. like elec. is formed at 180 amp. Drops Tungsten at 220 amp. Arc becomes unstable at 240 amp. Red: WT 20 2% Thorium oxide The point gets a coarse structure at 100 amp. Drops Tungsten at 220 amp. Arc becomes unstable at 260 amp. Green: WP Pure Tungsten The point forms a small, shiny ball at 50 amp. A ball with dia. like elec. is formed at 80 amp. The ball gets a larger dia. than elec. at 140 amp.Drops Tungsten at 200 amp. Arc becomes unstable at 200 amp. Grey: WC 20 2% Cerium oxide The point forms a small, shiny ball at 100 amp.A ball with dia. like elec. is formed at 180 amp.Drops Tungsten at 260 amp. Arc becomes unstable at 280 amp. Black: WL 10 1% Lanthan oxide The point forms a small, shiny ball at 100 amp. A ball with dia. like elec. is formed at 200 amp. Drops Tungsten at 260 amp. Arc becomes unstable at 280 amp. Turquoise: WS 2 ? % Rare materials The point forms a small, shiny ball at 100 amp.A ball with dia. like elec. is formed at 160 amp.Drops Tungsten at 260 amp. Arc becomes unstable at 280 amp. Orange: WT 40 4% Thorium oxide The point forms a small, shiny ball at 100 amp.The point gets a coarse structure at 140 amp.Drops Tungsten at 200 amp. Arc becomes unstable at 240 amp. Lilac: WT 30 3% Thorium oxide The point forms a small, shiny ball at 100 amp.A ball with dia. like elec. is formed at 160 amp.Drops Tungsten at 260 amp. Arc becomes unstable at 260 amp. (not illustrated)
See illustration no. 1 19