Fenix 200 Bedienungsanweisung Seite 41

Selection and preparation of tungsten electrodes:
Table 7 the values of welding current and electrode
diameter tungsten with 2% thorium - red marking
electrodes.
Table 7
Electrode (mm)
1,0
1,6
2,4
Tungsten electrode shall be prepared according to
the values in chart 8 and picture number 6.
Picture 6
Table 8
o
α ( )
30
60-90
90-120
Sharpening of tungsten electrode:
By the right choice of tungsten electrode and its pre-
paration we can influence qualities of welding arc,
geometry of the weld and durability/service life of
the electrode. It is necessary to sharpen the electro-
de softly in the traverse/horizontal direction accord-
ing to picture 7.
Picture 8 shows the influence of sharpening the
electrode on its durability/service life.
Picture 7
Picture 8A: soft and well-proportioned sharpening
the electrode in traverse/horizontal direction - dura-
bility up to 17 hours
Picture 8B: rough and irregular sharpening in vertical
direction - durability up to 5 hours
Parameters for comparing the influence of the way
of sharpening the electored are given with the utili-
sation:
HF striking the el. arc, electrodes  3.2 mm welding
current 150A and welding material pipe.
PROTECTIVE GAS
For welding by method TIG it is necessary to use
Argon with the purity 99.99 %. The amount of the
flow shall be determined according to the table 9.
Welding current (A)
15-75
60-150
130-240
Welding current (A)
0-30
30-120
120-250
A B
Picture 8
Table 9
Welding
Electrode
current
diameter
(A)
6-70 1.0 mm
60-140 1.6 mm
120-240 2.4 mm
HOLDING OF THE WELDING TORCH DURING WEL-
DING
position w (PA)
PREPARATION OF BASIC MATERIAL
In table 10 there are given values for preparing mate-
rial. Sizes shall be determined according to picture 9.
Picture 9
Table 10
s (mm) a (mm)
0-3
3
4-6
BASIC RULES DURING WELDING BY TID METHOD
1. Purity - grease, oil and other impurities must be
removed from the weld during welding. It is also
necessary to mind purity of additional material
and clean gloves of the welder during welding.
2. Leading additional material - oxidation must be
prevented. To do so, flashing end of additional
-41 -
Welding nozzle
 (mm)
o
n ( )
4/5 6/8.0
4/5/6 6.5/8.0/9.5
6/7 9.5/11.0
position h (PB)
position s (PF)
position h (PB)
d a
d (mm)
0 0
0 0.5 (max)
1-1.5 1-2
Gas
flow
(l/min)
5-6
6-7
7-8
s
o
α ( )
0
0
60