Preparing Tungsten For Dc Electrode Negative (Dcen) Welding - Weldclass Weldforce 155M Operating Instructions Manual

2.4mm (3/32")
3.2mm (1/8")

13.1.2 Preparing Tungsten for DC Electrode Negative (DCEN) Welding

The electrode should be pointed (tapered) according to the welding current.
Grind end of tungsten on fine grit, hard abrasive wheel before welding. Do not use wheel for other jobs
or tungsten can become contaminated causing lower weld quality.
Rule of thumb is that the taper section should be 2.5 times the Electrode Diameter.
Figure 61
Ideal Tungsten Preparation = Stable ARC
Diameter of the flat left on the end of the Electrode determines amperage capacity.
Figure 62
Wrong Tungsten Preparation = Wandering ARC
Figure 63
Pointing the Tungsten Electrode
The electrode should be pointed according to the welding current.
Figure 64
65 – 115
100 – 165
© Weldclass 2020 | E.&O.E.
Weldforce 155
Table 20
Electrode Angles
Angle @ Range of Current (Amps)
30° 0 – 30
60-90° 30 -120
90-120° 120 - 250
120° ≥250
Table 21
175
M & MST
57