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3.4.1. TIG WELDING RECOMMENDATIONS.
We will have different tungsten electrode solutions depending on the application and its alloy percentage.
Type of electrode
Thorium 0,5%
BLUE
Continuous
Thorium 1%
YELLOW
Continuous
Thorium 2%
RED
Continuous
Cerium 2%
GREY
Continuous
Lanthanum
BLACK
Continuous
1%
Lanthanum
GOLD
Continuous
1.5%
The range of currents of use for each of the electrode diameters and recommended current densities,
depending on the material to be welded, is given in the table below.
Intensities
ELECTRODE Ø
Min-Max
1.6 mm
60 to 150A
2.0 mm
100 to 200A
2.4 mm
170 to 250A
3.2 mm
225 to 330A
The shape of the electrode tip will directly affect the stability of the electric arc. The sharpening must be
between 1.5 and 2 times the electrode diameter. With a length of twice its diameter and being sharpened
lengthwise to facilitate the current transmission.
As a general rule, we will use Argon as a shielding gas as its low ionisation energy, which gives rise to easy
striking, very stable and low energy arcs, make it the ideal gas for small thicknesses.
3.4.2. WELDING EXECUTION.
The filler material must have the same nature as the weld
metal, verifying that it is humidity-free and selecting the
appropriate diameter in agreement with the thickness to be
welded. During the welding, we must maintain the end of the
rod within the action field of the protection gas, to prevent its
contamination.
In thicknesses of less than 3 mm and with the right edge
preparation, the weld metal is not always necessary.
GALAXY 3000 GE MV VRD
Current
Metal to weld
Carbon steel, stainless steel,
titanium, etc.
Carbon steel, stainless steel,
titanium, etc.
Carbon steel, stainless steel,
titanium, etc.
Carbon steel, stainless steel,
titanium, etc.
Carbon steel, stainless steel,
titanium, etc.
Carbon steel, stainless steel,
titanium, etc.
MATERIAL
CARBON STEEL
STAINLESS STEEL
COPPER
Material
Carbon steel
and stainless
steel
Copper and
cooper
alloys
Arc stability
Arc striking
**
*
*
**
*
***
**
*
**
***
**
***
Intensity / thickness
30 A/mm
30-33 A/mm
70 A/mm
Tungsten Ø
Thickness
1.0
1.0
1.5
1.0 / 1.6
2.0
1.6
3.0
1.6 / 2.4
4.0
2.4
6.0
3.2
1.0
1.0
1.5
1.6
3.0
2.4
EN
Duration of
Temperature
electrode
resistance
*
**
**
**
**
**
**
**
***
***
***
***
Amps
Nozzle no.
20 -50
4
40 - 80
5
50 - 90
5
70 - 120
6
100 - 160
7
120 - 200
7
60 - 80
4
100 - 150
5
160 - 240
6
29
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