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Tungsten tip preparation
DCSP (EN) or DCRP (EP)
= Diameter
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 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
Standard Parts
General
purpose
3x Dia
28
Flat
1/4–1/2x Dia
Taper length
2–3x Dia
Max. ball
1x Dia
Tungsten extension
Gas Lens Parts
General
purpose
3x Dia
Maximum
6x Dia
(in draft free areas)
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
diameter
arc tip
(mm)
(mm)
1.0
0.125
1.0
0.250
1.6
0.500
1.6
0.800
2.3
0.800
2.3
1.100
3.2
1.100
3.2
1.500
Constant
included
Current
angle,
range
(degrees)
(A)
12
2 – 15
20
5 – 30
25
8 – 50
30
10 – 70
35
12 – 90
45
15 – 150
60
20 – 200
90
25 – 250
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