31
Metal
gaUge
joint
type
tUngsten
siZe
filler
rod siZe
cUp
siZe
shield gas floW
Welding
aMperes
travel
speed
type
cfh
(l/Mn)
psi
1/16
(1.6mm)
BUtt
1/16 (1.6mm)
1/16
(1.6mm)
4, 5, 6
argon
11 (5.5)
20
80-100
12
(307.2mm)
fillet
90-100
10 (256mm)
1/8
(3.2mm)
BUtt
1/16 (1.6mm)
3/32
(2.4mm)
4, 5, 6
argon
11 (5.5)
20
120-140
12
(307.2mm)
fillet
130-150
10 (256mm)
3/16
(4.8mm)
BUtt
3/32 (2.4mm)
1/8
(3.2mm)
5, 6, 7
argon
13 (6)
20
200-250
12
(307.2mm)
fillet
3/32 (2.4mm)
1/8 (3.2mm)
225-275
10 (256mm)
1/4
(6.4mm)
BUtt
1/8 (3.2mm)
3/16
(4.8mm)
8, 10
argon
13 (6)
20
275-350
10 (256mm)
fillet
300-375
8
(204.8mm)
Welding stainless steel
in tig welding of stainless steel, welding rods
having the aWs-astM prefixes of e or er can be
used as filler rods. however, only bare uncoated
rods should be used. light gauge metals less
then 1/16” (1.6mm) thick should always be
welded with dcsp using argon gas. follow the
normal pecautions for welding stainless such
as: clean surfaces; dry electrodes; use only
stainless steel tools and brushes, keep stainless
from coming in contact with other metals.
Metal
gaUge
joint
type
tUngsten
siZe
filler
rod siZe
cUp
siZe
shield gas floW
Welding
aMperes
travel
speed
type
cfh
(l/Mn)
psi
1/16
(1.6mm)
BUtt
1/16 (1.6mm)
1/16
(1.6mm)
4, 5, 6
argon
15 (7)
20
95-135
15 (384mm)
fillet
95-135
15 (384mm)
1/8
(3.2mm)
BUtt
1/16 (1.6mm)
3/32 (2.4mm)
3/32
(2.4mm)
4, 5, 6
argon
15 (7)
20
145-205
11 (258.6mm)
fillet
145-205
11 (258.6mm)
3/16
(4.8mm)
BUtt
3/32 (2.4mm)
1/8
(3.2mm)
7, 8
argon
16 (6.5)
20
210-260
10 (256mm)
fillet
210-260
10 (256mm)
1/4
(6.4mm)
BUtt
1/8 (3.2mm)
5/32
(4.0mm)
8, 10
argon
18 (8.5)
20
240-300
10 (256mm)
fillet (2)
240-300
10 (256mm)
Welding loW alloy steel
Mild and low carbon steels with less then 0.30%
carbon and less than 1” (2.5cm) thick, generally
do not require preheat. an exception to this
allowance is welding on highly restrained joints.
these joints should be preheated 50 to 100°f
(10 to 38°c) to minimize shrinkage cracks in
the base metal. low alloy steels such as the
chromium-molybdenum steels will have hard
heat affected zones after welding, if the preheat
temperature is too low. this is caused by rapid
cooling of the base material and the formation
of martensitic grain structures. a 200 to 400°f
(93 to 204°c) preheat temperature will slow
the cooling rate and prevent the martensitic
structure.
Metal
gaUge
joint
type
tUngsten
siZe
filler rod
siZe
cUp
siZe
shield gas floW
Welding
aMperes
travel
speed
type
cfh
(l/Mn)
psi
1/16
(1.6mm)
BUtt
1/16
(1.6mm)
1/16 (1.6mm)
4, 5, 6
argon
18 (9)
15
110-140
12
(307.2mm)
fillet
130-150
10
(256mm)
1/8
(3.2mm)
BUtt
3/32
(2.4mm)
3/32 (2.4mm)
4, 5, 6
argon
18 (9)
15
175-225
11
(258.6mm)
fillet
200-250
9
(230.4mm)
3/16
(4.8mm)
BUtt
1/8 (3.2mm)
1/8 (3.2mm)
8, 10
heliUM
36
(17.5)
15
190-225
10
(256mm)
fillet
205-250
8
(204.8mm)
1/4
(6.4mm)
BUtt (2)
3/16
(4.8mm)
1/8 (3.2mm)
8, 10
heliUM
36
(17.5)
15
225-260
9
(230.4mm)
fillet
250-280
7
(179.2mm)
Welding deoXidiZed copper
Where extensive welding is to be done, the use
of deoxidized (oxygen-free) copper is preferable
over electrolytic tough pitch copper. although
tig welding has been used occasionally to weld
zinc-bearing copper alloys, such as brass and
commercial bronzes, it is not recommended
because the shielding gas does not suppress the
vaporization of zinc. for the same reason zinc
bearing filler rods should not be used. there is
some preference of helium for the inert
atmosphere in welding thickness above 1/8”
(3.2mm) because of the improved weld metal
fluidity. preheating recommendations should be
followed.
deoXidised copper
stainless steel
loW alloy steel
