T.O. 1-1A-9
Basically the welding characteristics and other associated data are related In the following table.
TABLE 2-18. FUSION WELDING CHARACTERISTICS OF CORROSION RESISTING STEEL - GENERAL
ALLOY/DESIGN
RECOMMENDED
FILLER MATERIAL/SPEC
HEAT TREATMENT
REMARKS
TYPE
STRUCTURE
TYPE
ELECTRODE
ROD
PREHEAT
POSTHEAT
MATERIAL
TREAT
301
Austenitic
308
MILE-6844
MIL-R-5031
None re-
Anneal after
Subject to intergranular
302
Class I,
quired if
welding type
corrosion (at 800
-
AMS 5681
above 60°E
301 at 1950°
-
1550
F) in weld and
Material
20500F, 1
heat affected zone,
should be
hour each
unless annealed after
annealed.
inch of thick-
welding, therefore,
ness, water
strain hardened tem-
quench, Cool-
pers i.e., 1/4H, 1/2H,
ing to 800°F
3/4 & hard are suitable
should occur
for fusion welding and
in 3 minutes.
brazing.
Welded
material should be
annealed.
303
Austenitic
310
MILE-6844
MIL-R-5031
None re-
Anneal after
Not recommended for
Class 3
Class 3,
quired if
welding. See
welding however, can
AMS 5695
AMS 5695
above 60°
Heat Treat
be fusion welded to a
F.
Data para-
limited extent but
graph.
post-weld annealing
is required.
304
Austenitic
308
MIL-R-5031
None re-
To restore
Inert gas tungsten
Class 1,
quired if
corrosion re-
arc method is re-
AMS 5681
above 600
sistance and
commended for
F.
to remove pre- welding sheet up to
cipitated car-
1/8" thick. Shielded
bides, heat
metal are process is
treat 1850
-
preferred for sheet
2000
F, 1/2-
over 1/8" thick.
1 hour per
Some sensitization
inch of thick-
on welding may occur
ness, and then
in type 304 especially
cool to below
if metal is over 1/8"
800
F within 3
thick. Type 304L is
minutes maxi-
susceptible to inter-
mum by
granular corrosion if
quenching in
heated at approxi-
air. (Not re-
mately 1200
F for a
quired for 304
long time, however,
L unless sub-
type 304 is susceptible
jected to
to intergranular cor-
1200°F for a
rosion when heated in
prolonged
800°- 1600
F range or
period.)
welded. Type 304L
due to low carbon con-
tent (0.03% maximum)
is the recommended
grade for welding.
2-94
