Kühtreiber MAKin 200 Multi MIG, Инструкция по эксплуатации

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3. press the button on the burner.
4. release the button on the burner to end the welding process.
Welding process at TIG LA
(picture 1)
starting the gas with a valve on the welding torch.
1. approaching the tungsten electrode to the welded material.
2. light touch of tungsten electrode of welded material (no need to strike).
3. removal of tungsten electrode and arcing of welding arc with la - very low
wear tungsten electrodes by touch.
4. Welding process.
5. Finishing the welding process and activating the doWN slope (crater fi -
lling) is performed by removing tungsten-electrodes to about 8 - 10 mm
from the welded material.
6. re-approach - Welding current decreases after the set time to the end va -
lue set current (eg 10 a) - filling the crater.
7. end of the welding process. the digital control automatically switches off
the welding process.
switch off the gas with a valve on the welding torch.
1 2 3 4 5 6 7
1-3 mm 1-3 mm 1-3 mm 8-10 mm
0 - 5 s POST GAS
I
0
ON
IW
I
START
I
END
picture 1 - welding process at tiG la
Selection and preparation of tungsten electrodes:
table 1 shows the welding current and diameter values for tungsten
electrodes with 2 % thoria - red electrode markings.
table 1
Diameter of the Electrode (mm) Welding Current (A)
1.0 15 - 75
1.6 60 - 150
2.4 130 - 240
prepare the tungsten electrode according to the values in table 2 and
picture 2.
picture 2
α
table 2
α (°) Welding current (A)
30 0 - 30
60 - 90 30 - 120
90 - 120 120 - 250
Grinding of tungsten electrodes:
By proper choice of the tungsten electrode and its preparation will affect
the properties of the welding arc, weld geometry and electrode life. the
electrode must be gently grinded in the longitudinal direction as shown in
picture 3. picture 4 shows the effect of grinding the electrode on its service
life.
picture 3 picture 4
Picture 4A - Fine and even grinding of the electrode in the longitudinal
direction - lifetime up to 17 hours
Picture 4B - coarse and uneven grinding in the transverse direction - lifetime
about 5 hours
a b
parameters to compare the influence of the electrode grinding method are
given using:
hF ignition el. arc, electrodes Ø 3.2 mm, welding current 150 a and welded
material - pipe.
Protective gas:
For tiG welding, it is necessary to use argon with a purity of 99.99 %. deter -
mine the amount of flow according to table 3.
table 3
Welding
current
(A)
Diameter of
electrode
(mm)
Welding nozzle
Flow of gas
(l/min)
n (°) Ø (mm)
6 - 70 1.0 4/5 6/8,0 5 - 6
60 - 140 1.6 4/5/6 6.5/8.0/9.5 6 - 7
120 - 240 2.4 6/7 9.5/11.0 7 - 8
Holding the welding torch during welding:
90°
45°
position W (pa) position h (pB)
10 – 30°
15 – 40°
position s (pF)
10
- 30°
20 - 30°
position s (pF)
Preparation of basic material:
table 4 lists the material preparation values. dimensions are determined
according to pic. 5.
picture 5
a
s
α
d
table 4
s (mm) a (mm) d (mm) α (°)
0 - 3 0 0 0
3 0 0.5 (max) 0
4 - 6 1 - 1.5 1 - 2 60
Basic rules during welding by TIG 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 material must be always under the protection
of gas flowing from the hose.
3. type and diameter of tungsten electrodes - it is necessary to choose them
according to the values of the current, polarity, type of basic material and
composition of protective gas.
4. sharpening of tungsten electrodes - sharpening the tip of the electrode
should be done in traverse/horizontal direction. the tinier the roughness
of the surface of the tip is, the calmer the burning of the el. arc is as well
as the greater durability of the electrode is.