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Tungsten Electrode for TIG welding

Source:未知Author:admin Addtime:2021-05-06 09:40:04 Click:

Tungsten Electrode for TIG welding

Tungsten electrodes are used when arc welding with the Tungsten Inert gas (TIG) process or when plasma welding. In both processes the electrode, arc and weld pool are protected from atmospheric contamination by an inert gas. A tungsten electrode is used because it can withstand very high temperatures with minimal melting or erosion. Tungsten electrodes are made by powder metallurgy and are formed to size after sintering.

TIG welding tungsten electrodes usually contain small quantities of other metallic oxides which can offer the following benefits:-

facilitate arc starting
increase arc stability
improve current-carrying capacity of the rod.
reduce the risk of weld contamination
increase electrode life

Oxides used are primarily those of zirconium, thorium, lanthanum, yttrium or cerium. Additions are usually of order 1%-4%. All these oxides greatly improve arc initiation, especially when direct current (DC) welding is employed. Thorium oxide (thoria) has been used for many years having been found effective in terms of long life and thermal efficiency. Zirconium oxide (zirconia) has been commonly used for alternating current (AC) TIG welding, normally for welding aluminium.

Type	Grade	Color	Chemical Composition (%)			Features
Type	Grade	Color	R.E	Impurities	W	Features
Pure	WP	Green	/	≤0.05	Balance	Non-radioactive, AC welding, aluminum, magnesium, their alloys
Thorium	WT10	Yellow	0.9~1.1	≤0.05	Balance	Excellent electron emission, overall performances, high current-carrying capacity radioactivity, DC welding, carbon steel, stainless steel, nickel and titanium alloys.
	WT20	Red	1.8~2.2	≤0.05	Balance
	WT30	Purple	2.8~3.2	≤0.05	Balance
	WT40	Orange	3.8~4.2	≤0.05	Balance
Lanthanum	WL10	Black	0.9~1.1	≤0.05	Balance	Non-radioactive, excellent electric conductivity and welding capacity, high current-carrying capacity, minimum ratio of burnt area, DC welding
	WL15	Gold	1.3~1.7	≤0.05	Balance
	WL20	Blue	1.8~2.2	≤0.05	Balance
Cerium	WC10	Pink	0.9~1.1	≤0.05	Balance	Non-radioactive, easier arc initiation under low current circumstances, low arc- maintaining current, pipelines, small components and discontinuous welding
	WC15	Orange	1.3~1.7	≤0.05	Balance
	WC20	Grey	1.8~2.2	≤0.05	Balance
Yttrium	WY20	Blue	1.8~2.2	≤0.05	Balance	Non-radioactive, long and slim arc beam with high compression, deeper burning groove under medium and high current circumstances
Compound	WX	Cyan	1.0~5.0	≤0.05	Balance	Different additives

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