24
Tungsten tip preparation
= Diameter
Taper length
2–3x Dia
Flat
1/4–1/2x Dia
DCSP (EN) or DCRP (EP)
Max. ball
1x Dia
ACHP General Purpose
Ball tip by arcing on clean metal at low current DCRP (EP)
then slowly increase current to form the desired ball diameter.
Return setting to AC.
Tungsten electrode tip shapes and current ranges
Thoriated, ceriated, and lanthanated tungsten electrodes do not ball as readily as pure or zirconiated tungsten electrodes, and as such
are typically used for DCSP welding. These electrodes maintain a ground tip shape much better than the pure tungsten electrodes. If
used on AC, thoriated and lanthanated electrodes often spit. Regardless of the electrode tip geometry selected, it is important that
a consistent tip configuration be used once a welding procedure is established. Changes in electrode geometry can have a significant
influence not only on the weld bead width, depth of penetration, and resultant quality, but also on the electrical characteristics of the
arc. Below is a guide for electrode tip preparation for a range of sizes with recommended current ranges.
Electrode Diameter (mm)
Diameter ar tip (mm)
Constant included angle,
(degrees)
Current range (A)
1.0
0.125
12
2–15
1.0
0.250
20
5–30
1.6
0.500
25
8–50
1.6
0.800
30
10–70
2.3
0.800
35
12–90
2.3
1.100
45
15–150
3.2
1.100
60
20–200
3.2
1.500
90
25–250
Tungsten Grinding
Shape by grinding longitudinally
(never radially). Remove
the sharp point to leave a
truncated point with a flat
spot. Diameter of flat spot
determines amperage capacity.
(See below)
The included angle determines
weld bead shape and size.
Generally, as the included
angle increases, penetration
increases and bead width
decreases.
Use a medium (60 grit or
finer) aluminium oxide wheel.
Tungsten Extension
General
purpose
3x Dia
Standard Parts
General
purpose
3x Dia
Maximum
6x Dia
Gas Lens Parts
(in draft free areas)
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