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10.0 TIG welding of materials
10.1 Application summary
Material
C-Mn steel
Alloyed steel
Copper and Cu alloys
Nickel and Ni alloys
Titanium and Ti alloys
Aluminum and Al alloys
Magesium and Mg alloys
10.2 C-Mn steel
TIG welding may be used for welding carbon steel
but because deposition rates are low, it is usually
only used for welding sheet and thin sections for
high quality applications, small components, and
root passes of multipass butt joints in plate and
pipe.
Standard DC TIG equipment is normally suitable and
DCEN polarity is usually chosen to provide good
workpiece heating.
Only inert or reducing gases should be used for TIG
welding and pure argon is normally recommended
as the shielding gas for steel.
C-Mn steel welding parameters
Plate thickness (mm)
Joint type
Number of passes
Tungsten electrode (mm)
Consumable size (mm)
Current (A)
Welding speed (cm/min)
Gasflow (l/min)
Shielding gas: Argon, Consumable ER70S-6, Position: Downhand, Polarity: DC–
Type of current
Direct current (-)
Direct current (-)
Direct current (-)
Direct current (-)
Direct current (-)
Alternating current (~)
Direct current (-) with Helium
Alternating current (~)
Filler rods are usually selected to match the
chemical composition and the mechanical
properties of the parent plate. The weldability of
the steel may impose restrictions on the choice of
filler rod.
Steels with carbon contents above about 0.3%
are hardenable, and fast cooling will produce a
hard HAZ and this is liable to result in hydrogen
cracking. This form of cracking can be prevented by
use of preheat and suitable welding procedures.
0.8
1
1.5
Fillet
Fillet
Fillet
1
1
1
1.6
1.6
1.6
1.6
1.6
2
70
90
110
30
30
30
5
5
6
Polarity
DC negative
DC negative
DC negative
DC negative
DC negative
DC negative
2
1
1.5
Fillet
Butt
Butt
1
1
1
2.4
1.6
1.6
2.4
1.6
2
130
80
120
25
20
20
6
6
7
2
Butt
1
2.4
2.4
140
20
7
33
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