A387 to Carbon Steel
1
Shielded Metal Arc Welding, Flux Cored Arc Welding, Gas Metal Arc Welding, Gas Tungsten Arc Welding, Submerged Arc Welding 152 153 Ű How to select the proper welding consumable for joining dissimilar metals The structural components of high temperature service equipment such as power generation boiler use several types of steels; therefore, joining dissimilar steels is unavoidable at the interface of different service condition areas. When joining carbon steels and Cr-Mo steels, or when joining dissimilar Cr-Mo steels, a filler metal with a composition similar to the lower-alloy steel or with an intermediate composition is commonly used for butt joints. For instance, carbon steel can readily be joined to 2.25Cr-1Mo steel by using either a carbon steel or a 1.25Cr-0.5Mo steel filler metal; however, carbon steel filler metals are usually selected except where carbon migration (the diffusion of carbon from lower-Cr metal to higher-Cr metal during PWHT and high temperature service) must be decreased. Likewise, 2.25Cr-1Mo steel can be joined to 9Cr-1Mo-V-Nb steel by using a 2.25Cr-1Mo filler metal. In contrast, Cr-Mo steel and austenitic stainless steel are joined with a high Cr-Ni stainless (e.g. E309) or, where carbon migration and thermal stress are important factors, nickel alloy (e.g. ENiCrFe-1) filler metal. For a quick guide to recommended welding consumables for joining dissimilar metals, refer to Table 1. Table 1 A quick guide to recommended welding consumables for joining dissimilar metals (1) (2) Base metal Mild steel 0.5Mo 1.25Cr-0.5Mo 2.25Cr-1Mo 5Cr-0.5Mo 9Cr-1Mo 9Cr-1Mo-V-Nb Type 304 stainless steel xNC-39 (E309), NC-39L (E309L), TG-S309 (ER309), TG-S309L (ER309L) xNI-C703D (ENiCrFe-3), NI-C70A (ENiCrFe-1), TG-S70NCb (ERNiCr-3) 9Cr-1Mo 9Cr-1Mo-V-Nb LB-52 (E7016) TG-S50 (ER70S-G) CM-A76 (E7016-A1) TG-SM (ER80S-G) CM-A96 (E8016-B2) TG-S1CM (ER80S-G) CM-A106 (E9016-B3) TG-S2CM (ER90S-G) CM-5 (E8016-B6) TG-S5CM (ER80S-B6) 5Cr-0.5Mo LB-52 (E7016) TG-S50 (ER70S-G) CM-A76 (E7016-A1) TG-SM (ER80S-G) CM-A96 (E8016-B2) TG-S1CM (ER80S-G) CM-A106 (E9016-B3) TG-S2CM (ER90S-G) 2.25Cr-1Mo LB-52 (E7016) TG-S50 (ER70S-G) CM-A76 (E7016-A1) TG-SM (ER80S-G) CM-A96 (E8016-B2) TG-S1CM (ER80S-G) 1.25Cr-0.5Mo LB-52 (E7016) TG-S50 (ER70S-G) CM-A76 (E7016-A1) TG-SM (ER80S-G) 0.5Mo LB-52 (E7016) TG-S50 (ER70S-G) Note: (1) This table guides to recommended filler metals matching the lower-alloy steels in various dissimilar metal joints, excepting for Type 304 steel. Other types of filler metals may be needed where a specific requirement is imposed. Note: (2) Preheating and postweld heat treatment for dissimilar Cr-Mo steels should be sufficient to the higher-alloy steel; however, the PWHT temperature should be lower to avoid damage to the lower-alloy steel and minimize the carbon migration. Type 304 stainless steel should not be preheated or postweld heat-treated to avoid sensitization. For Heat-Resistant Low-Alloy Steel
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A387 to Carbon Steel
Transcript of A387 to Carbon Steel
Shie
lded
Met
al A
rc W
eldi
ng, F
lux
Cor
ed A
rc W
eldi
ng, G
as M
etal
Arc
Wel
ding
, Gas
Tun
gste
n A
rc
Wel
ding
, Sub
mer
ged
Arc
Wel
ding
152
153
How
to s
elec
t the
pro
per w
eldi
ng c
onsu
mab
le fo
r joi
ning
dis
sim
ilar m
etal
s
The
stru
ctur
al c
ompo
nent
s of
hig
h te
mpe
ratu
re s
ervi
ce e
quip
men
t suc
h as
pow
er g
ener
atio
n bo
iler u
se
seve
ral t
ypes
of
stee
ls; t
here
fore
, joi
ning
dis
sim
ilar
stee
ls is
una
void
able
at t
he in
terfa
ce o
f diff
eren
t se
rvic
e co
nditio
n ar
eas.
Whe
n jo
inin
g ca
rbon
ste
els
and
Cr-M
o st
eels
, or w
hen
join
ing
diss
imila
r Cr-M
o st
eels
, a
fille
r m
etal
with
a c
ompo
sitio
n si
mila
r to
the
low
er-a
lloy
stee
l or
with
an
inte
rmed
iate
co
mpo
sitio
n is
com
mon
ly u
sed
for b
utt j
oint
s.
For i
nsta
nce,
car
bon
stee
l can
read
ily b
e jo
ined
to 2
.25C
r-1M
o st
eel b
y us
ing
eith
er a
car
bon
stee
l or a
1.
25C
r-0.5
Mo
stee
l fille
r m
etal
; how
ever
, car
bon
stee
l fille
r m
etal
s ar
e us
ually
sel
ecte
d ex
cept
whe
re
carb
on m
igra
tion
(the
diffu
sion
of c
arbo
n fro
m lo
wer
-Cr m
etal
to h
ighe
r-Cr m
etal
dur
ing
PWH
T an
d hi
gh
tem
pera
ture
ser
vice
) m
ust b
e de
crea
sed.
Lik
ewis
e, 2
.25C
r-1M
o st
eel c
an b
e jo
ined
to 9
Cr-1
Mo-
V-N
b st
eel b
y us
ing
a 2.
25C
r-1M
o fil
ler m
etal
.
In c
ontra
st, C
r-Mo
stee
l and
aus
teni
tic s
tain
less
ste
el a
re jo
ined
with
a h
igh
Cr-N
i sta
inle
ss (e
.g. E
309)
or,
wher
e ca
rbon
mig
ratio
n an
d th
erm
al s
tress
are
impo
rtant
fact
ors,
nic
kel a
lloy
(e.g
. EN
iCrF
e-1)
fille
r met
al.
For a
qui
ck g
uide
to re
com
men
ded
wel
ding
con
sum
able
s fo
r joi
ning
dis
sim
ilar m
etal
s, re
fer t
o Ta
ble
1.
Tabl
e 1
A qu
ick
guid
e to
reco
mm
ende
d we
ldin
g co
nsum
able
s fo
r joi
ning
dis
sim
ilar m
etal
s (1
) (2)
Bas
e m
etal
M
ild s
teel
0.5M
o 1.
25C
r-0.
5Mo
2.25
Cr-
1Mo
5Cr-
0.5M
o9C
r-1M
o9C
r-1M
o-V-
Nb
Type
304
st
ainl
ess
stee
l
NC
-39
(E30
9), N
C-3
9L (E
309L
), TG
-S30
9 (E
R30
9), T
G-S
309L
(ER
309L
)
NI-C
703D
(EN
iCrF
e-3)
, NI-C
70A
(EN
iCrF
e-1)
, TG
-S70
NC
b (E
RN
iCr-3
)
9Cr-
1Mo
9Cr-
1Mo-
V-N
b
LB-5
2(E
7016
)TG
-S50
(ER
70S-
G)
CM
-A76
(E70
16-A
1)TG
-SM
(E
R80
S-G
)
CM
-A96
(E80
16-B
2)
TG-S
1CM
(E
R80
S-G
)
CM
-A10
6(E
9016
-B3)
TG-S
2CM
(E
R90
S-G
)
CM
-5(E
8016
-B6)
TG
-S5C
M
(ER
80S-
B6)
5Cr-
0.5M
o LB
-52
(E70
16)
TG-S
50(E
R70
S-G
)
CM
-A76
(E70
16-A
1)TG
-SM
(E
R80
S-G
)
CM
-A96
(E80
16-B
2)
TG-S
1CM
(E
R80
S-G
)
CM
-A10
6(E
9016
-B3)
TG-S
2CM
(E
R90
S-G
)
2.25
Cr-
1Mo
LB-5
2(E
7016
)TG
-S50
(ER
70S-
G)
CM
-A76
(E70
16-A
1)TG
-SM
(E
R80
S-G
)
CM
-A96
(E80
16-B
2)
TG-S
1CM
(E
R80
S-G
)
1.25
Cr-
0.5M
o LB
-52
(E70
16)
TG-S
50(E
R70
S-G
)
CM
-A76
(E70
16-A
1)TG
-SM
(E
R80
S-G
)
0.5M
oLB
-52
(E70
16)
TG-S
50(E
R70
S-G
)
Not
e: (
1) T
his
tabl
e gu
ides
to
reco
mm
ende
d fil
ler
met
als
mat
chin
g th
e lo
wer-a
lloy
stee
ls in
var
ious
di
ssim
ilar m
etal
join
ts, e
xcep
ting
for T
ype
304
stee
l. O
ther
type
s of
fille
r met
als
may
be
need
ed w
here
a
spec
ific
requ
irem
ent i
s im
pose
d.
Not
e: (2
) Pre
heat
ing
and
post
wel
d he
at tr
eatm
ent f
or d
issi
mila
r Cr-M
o st
eels
sho
uld
be s
uffic
ient
to th
e hi
gher
-allo
y st
eel;
howe
ver,
the
PWH
T te
mpe
ratu
re s
houl
d be
lowe
r to
avoi
d da
mag
e to
the
lowe
r-allo
y st
eel a
nd m
inim
ize
the
carb
on m
igra
tion.
Typ
e 30
4 st
ainl
ess
stee
l sho
uld
not b
e pr
ehea
ted
or p
ostw
eld
heat
-trea
ted
to a
void
sen
sitiz
atio
n.
ForH
eat-
Resi
stan
t Low
-Allo
y St
eel
