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31
Electrode Included Angle/Taper - DC Welding
Tungsten electrodes for DC welding should be ground longitudinally and concentrically with diamond wheels to a

offer different weld penetration capabilities. In general, blunter electrodes that have a larger included angle provide




.
Sharper electrodes with smaller included angle provide:



The included angle determines weld bead shape and size. Generally, as the included angle increases, penetration
increases and bead width decreases.
Tungsten Preparation
Always use DIAMOND wheels when grinding and cutting. While tungsten is a very hard material, the surface of a
diamond wheel is harder, and this makes for smooth grinding. Grinding without diamond wheels, such as aluminium

contribute to weld inconsistency and weld defects.
Always ensure to grind the tungsten in a longitudinal direction on the grinding wheel. Tungsten electrodes are
manufactured with the molecular structure of the grain running lengthwise and thus grinding crosswise is “grinding
against the grain.” If electrodes are ground crosswise, the electrons have to jump across the grinding marks and the

the end of the tungsten tip. The arc starts straight and remains narrow, concentrated, and stable.
grind longitudinal on the
grinding wheel

the grinding wheel

2.5 times tungsten diameter
pointed tip
Electrode Tip/Flat
The shape of the tungsten electrode tip is an important process variable in precision arc welding. A good selection


and eliminates arc wonder will improve the weld penetration and increase the electrode life. Some welders still grind
electrodes to a sharp point, which makes arc starting easier. However, they risk decreased welding performance from
melting at the tip and the possibility of the point falling off into the weld pool.

included angle
Tungsten Diameter at Constant Included Current Range Current Range
Diameter the Tip - mm Angle - Degrees Amps Pulsed Amps
     
1.6mm .500 25 08 - 50 05 - 100
     
     
2.4mm 1.100 45 15 - 150 15 - 250
     
     
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