CARBONE PowerMaster205, Operator'S Manual

Page: 23 / 48

B-9 OPERATION B-9
·
● Set the AC Balance control to maximum 70%
electrode negative. This can be reduced if the
material welded is heavily oxidized, however
starting at maximum and adjusting to less is
desired.
.
● Set the AC Frequency in the 100 to 120 Hz range.
This is a "Sweet Spot" for most aluminum
applications.
GTAW Process
Electrode Polarity
DC AC Approximate Argon
Electrode Tip
Preparation
Sharpened Balled Gas Flow Rate
Electrode Type C.F.H. (l/min.)
Electrode
Size-in. (mm)
EWTh-1, EWLa-1
EWTh-2, EWCE-2
EWG
EWP
EWTh-1, EWLa-1
EWTh-2, EWCE-2
EWG, EWZr
Aluminum
Stainless
Steel
.010 (0.25) Up to 15 A.
Up to 10 A.
Up to 15 A. 3-8 (2-4) 3-8 (2-4)
.020 (0.50) Up to 15 A. Up to 15 A. Up to 20 A. 5-10 (3-5) 5-10 (3-5)
040 (1.0) . Up to 80 A. Up to 40 A. Up to 60 A. 5-10 (3-5) 5-10 (3-5)
1/16 (1.6) Up to 150 A. Up to 100 A Up to 130 A . 5-10 (3-5) 9-13 (4-6)
3/32 (2.4) Up to MAX. A. Up to 160. A. Up to MAX. A. 13-17 (6-8) 11-15 (5-7)
1/8 (3.2) X Up to MAX. A. X 15-23 (7-11) 11-15 (5-7)
Tungsten electrodes are classified as follows by the American Welding Society (AWS):
Pure....................... ..........EWP........green +1% Thoria.......................EWTh-1...yellow
+2% Thoria.......................EWTh-2...red +2% Ceria ................... ....EWCE-2...orange
+1.5% Lanthana ..............EWLa-1 ...black +0.5% to 0.40%Zirconia....EWZr.......brown
TRI-MIX of elements........EWG.........gray
Ceriated Tungsten is now widely accepted as a substitute for 2% Thoriated Tungsten in AC and DC applications.
PROTECTIVE GAS
Both argon and helium work when welding
aluminum. Argon is preferred, due to its lower cost
and consumption rate. This gas also tends to
stabilize the arc, thus making it easy to operate. For
some applications, however, the use of helium, or
argon-helium blends, is recommended due to better
weld penetration and faster travel speed. Helium is
especially suitable for welding thick workpieces.
The recommended gas flow rates are shown in
table 5.
TABLE 5
Current (A) Helium cfh-(l/min)
50 29 - (14)
100 29 - (14)
150 42 - (20)
200 42 - (20)
250 53 - (25)
300 53 - (25)