9
WELDING PARAMETERS
Table 3 shows some general indications for the choice of elec-
trode, based on the thickness of the parts to be welded. The
values of current to use are shown in the table with the respec-
tive electrodes for the welding of common steels and low-grade
alloys. These data have no absolute value and are indicative
data only. For a precise choice follow the instructions provided
by the electrode manufacturer.
The current to be used depends on the welding positions and
the type of joint, and it increases according to the thickness and
dimensions of the part.
The current intensity to be used for the different types of weld-
ing, within the field of regulation shown in table 4 is:
•
High for plane, frontal plane and vertical upwards welding.
•
Medium for overhead welding.
•
Low for vertical downwards welding and for joining small pre-
heated pieces.
A fairly approximate indication of the average current to use in
the welding of electrodes for ordinary steel is given by the fol-
lowing formula:
I = 50 × (Øe - 1)
Where:
I = intensity of the welding current
Øe = electrode diameter
Example:
For electrode diameter 4 mm
I = 50 × (4 - 1) = 50 × 3 = 150 A
TIG welding with “Lift”
In the TIG process welding is achieved by melting the two met-
al pieces to be joined, with the possible addition of material
from the outside, using an arc ignited by a tungsten electrode.
The “Lift” type ignition used in
DIX PI GO 2006.M / DIX PI GO
2006.M Puls
welding power sources makes it possible to re-
duce tungsten inclusions on ignition to a minimum. The molten
bath and the electrode are protected by and inert gas (for ex-
ample, Argon). This type of welding is used to weld thin sheet
metal or when elevated quality is required.
1) Connecting the welding cables (Fig. G):
•
Connect one end of the gas hose to the gas connecter on
the TIG torch and the other end to the pressure reducer
on the inert gas cylinder (Argon or similar).
Table 5
Ø ELECTRODE
(mm)
ELECTRODE TYPE
Current adjustment field (A)
TIG DC
Tungsten
Ce 1%
Grey
Tungsten
Rare ground 2%
Turchoise
1
10-50
10-50
1,6
50-80
50-80
2,4
80-150
80-150
3,2
150-250
150-250
4
200-400
200-400
•
With the welding power source switched off:
- Connect the ground cable to the snap-on connector
(positive).
- Connect the relative ground clamp to the workpiece or
to the workpiece support in an area free of rust, paint,
grease, etc..
- Connect the TIG torch power cable to the snap-on con-
nector marked - (negative).
2) Switch the welding power source on by moving the power
supply switch to I (Pos. 8, Fig. B).
3) Make the adjustments and do the parameter settings on the
control panel (for further information see the control panel
manual).
4) Open the gas cylinder and regulate the flow by adjusting
the valve on the TIG torch by hand.
5) Ignite the electric arc by contact, using a decisive, quick
movement without dragging the tungsten electrode on the
piece to be welded (“Lift” type ignition).
6) The welding power source has a SWS “Smart Welding
Stop” system for the end of TIG welding. Lifting up the torch
without switching off the arc will introduce a slope down and
it will switch off automatically.
7) When you have finished welding remember to shut the
valve on the gas cylinder.
Table 5 shows the currents to use with the respective elec-
trodes for TIG DC welding. This input is not absolute but is for
your guidance only; read the electrode manufacturers’ instruc-
tions for a specific choice. The diameter of the electrode to use
is directly proportional to the current being used for welding.
Table 3
Welding thickness (mm)
Ø electrode (mm)
1,2 ÷ 2
1,5 ÷ 3
3 ÷ 5
5 ÷ 12
≥ 12
≥ 20
1,6
2
2,5
3,25
4
≥ 5
Table 4
Ø electrode (mm)
Current (A)
1,6
2
2,5
3,2
4
5
6
30 ÷ 60
40 ÷ 75
60 ÷ 110
95 ÷ 140
140 ÷ 190
190 ÷ 240
220 ÷ 330
FIG. G
Содержание DIX PI GO 2006.M
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