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Lifetime of Tungsten electrodes

Welding current: DC ÷ 100 A Gas: Argon Parent mat.: Stainless steel AISI 304 FI = Fine IgnitionPI = Poor IgnitionUA = Unstable ArcT = Tungsten NP = No PointS = SlagDT = Drops TungstenP = PoorM = Mean F = Fine Type of electrode 5 10 15 20 25 30 Total min. min. min. min. min. min. evaluation Blue: WL 20 2% Lanthan oxide FIFIFIFIFIFIF+ Red: WT 20 2% Thorium oxide FIPIFIFIFIFIM Green: WP Pure Tungsten FIPIPIPIPI/NPUAPI/NPUAP Grey: WC20 2% Cerium oxide FIFIFIFIFIFIF Black: WL10 1% Lanthan oxide FIFIFIFIFIFIF+ Turquoise: ? % Rare materials FIPIFIPIPIPIM WS 2 Orange: 4% Thorium oxide FI/SFI/SFI/SFI/SFI/SFI/SNPP WT 40 Welding time: 5 min.Idle period: 15 secs. Welding current: 100 amp DC÷Pre-gas flow: 1 sec.Post-gas flow: 10 secs. Slope down: 4 secs.Slope up: 2 secs.Gas nozzle: no. 8 with gas lens Shielding gas: Ar.Shielding gas quantity:10 l/min.Electr. dist. to workpiece: 4 mm Electrode diameter: 1.6 mmElectrode point: 20
° Parent material: AISI 304
See illustration no. 6 29