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with the grain, the electrons flow steadily and easily to the end
of the tungsten tip. The arc starts straight and remains narrow,
concentrated, and stable.
ELECTRODE TIP/FLAT
The shape of the tungsten electrode tip is an important process
variable in precision arc welding. A good selection of tip/flat
size will balance the need for several advantages. The bigger
the flat, the more likely arc wander will occur and the more
difficult it will be to arc start. However, increasing the flat to the
maximum level that still allows arc start and eliminates arc
wander will improve the weld penetration and increase the
electrode life (Fig. 25). 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.
ELECTRODE INCLUDED ANGLE/TAPER - DC WELDING
Tungsten electrodes for DC welding should be ground
longitudinally and concentrically with diamond wheels to a
specific included angle in conjunction with the tip/flat
preparation. Different angles produce different arc shapes and
offer different weld penetration
capabilities (Fig. 26). In general,
blunter electrodes that have a
larger included angle provide the
following benefits:
•
Last Longer.
•
Have better weld penetration.
•
Have a narrower arc shape.
•
Can handle more amperage without eroding.
Sharper electrodes with smaller included angle provide:
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ARC 170 DUAL VOLTAGE ARC/TIG WELDER
8611295
Fig. 25
Fig. 26
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