Oleh:
Oleh:
Dana Citra
Dana Citra
Wijaya
Wijaya
Ikbal Rijalul Fikri
Ikbal Rijalul Fikri
Andri Septian Permadi
Andri Septian Permadi
Tobamas Sonjaya Silalahi
Tobamas Sonjaya Silalahi
Mahasi
Mahasi
swa T
swa T
eknik Metalu
eknik Metalu
rgi
rgi
FT-UNJANI
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1. PENDAHULUAN
1. PENDAHULUAN
Menentukan jenis
Menentukan jenis
pengelasan dan
pengelasan dan
elektroda
elektroda
Menentukan proses
Menentukan proses
prewelding dan
prewelding dan
prawelding
prawelding
Langkah pertama memilih jenis pengelasan untuk besi cor
Langkah pertama memilih jenis pengelasan untuk besi cor
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T
T
abel 1.1 Klasifikasi dari besi cor secara penamaan komersial berdasarkan Struktur
abel 1.1 Klasifikasi dari besi cor secara penamaan komersial berdasarkan Struktur
mikro dan bentuk patahan [1]
mikro dan bentuk patahan [1]
Penamaan Penamaan komersial komersial Fasa yang Fasa yang mengandung mengandung karbon karbon Matriks
Matriks (A)(A) PPaattaahhaann SSttrruukkttuur r aakkhhiir r
setelah setelah K Keellaabbuu GGrraaffiit t llaammeellaarr PP AAbbuu--aabbuu PPeemmbbeekkuuaann N Noodduullaarr GGrraaffiit t ssppeerrooiiddaall FF, , PP, , AA PePerraak k kkeeaabbuu- -abuan abuan Pembekuan atau Pembekuan atau Perlakuan Panas Perlakuan Panas Grafit GrafitKKoommppaakk GGrraaffiit t kkoommppaakk vermicular vermicular F F, , PP AAbbuu--aabbuu PPeemmbbeekkuuaann P Puuttiihh FFee33CC PP, , MM PuPuttiih h PPeemmbbeekkuuaan n ddaann Perlakuan Panas Perlakuan Panas(B)(B) Be
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2
2
. Klasifikasi Besi Cor
. Klasifikasi Besi Cor
D
Da
ah
hu
ullu
u
pe
p
en
ng
ge
ello
om
mp
po
ok
ka
an
n
b
be
es
sii
c
co
orr
b
be
errd
da
as
sa
arrk
ka
an
n
p
pa
ad
da
a
patahannya:
patahannya:
B
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Setelah ditemukan metalografi, pengelompokan besi cor meningkat:
Setelah ditemukan metalografi, pengelompokan besi cor meningkat:
Ben
Bentuk g
tuk graf
rafit : la
it : lamelar
melar, sp
, spher
heroida
oidal,
l, komp
kompak,
ak, dan te
dan temper
mper..
Mat
Matriks
riks : ferit
: feritik, p
ik, perl
erlitik
itik, au
, auste
steniti
nitik, ma
k, marte
rtensit
nsitik
ik dan ba
dan bainit
initik.
ik.
Pengelompokan berasal dari pabrik yang paling banyak digunakan:
Pengelompokan berasal dari pabrik yang paling banyak digunakan:
Bes
Besi
i cor
cor umum
umum :
: unt
untuk
uk apli
aplikasi
kasi tuj
tujuan
uan umum
umum (ti
(tidak
dak dipa
dipadu
du ata
atau
u
sedikit paduan)
sedikit paduan)
Bes
Besi co
i cor k
r khus
husus
us : unt
: untuk
uk apl
aplikas
ikasi k
i khus
husus
us (umu
(umumny
mnya p
a padu
aduan
an
tinggi)
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Besi Cor
Besi Cor
Kelabu
Kelabu
B
Bia
iasa
san
ny
ya
a me
memi
millik
ikii ka
kada
darr ka
karb
rbo
on
n
22,,5
5 -- 4
4%
%
Ju
Juml
mlah
ah sil
siliko
ikon
n ya
yang
ng re
rela
lati
tiff ti
ting
nggi
gi (1
(1-3
-3%)
%) di
dipe
perl
rluka
ukan
n
unt
untuk
uk mem
mempro
promos
mosikan
ikan gra
grafit
fit
Kec
Kecepa
epatan
tan pem
pembek
bekuan
uan lam
lambat ±
bat ± sed
sedang
ang
Gra
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Besi Cor Putih
Besi Cor Putih
B
Bia
iasa
san
ny
ya
a me
memi
millik
ikii ka
kada
darr ka
karb
rbo
on
n
22..5
5 -- 3
3%
%
Ju
Juml
mlah
ah si
sili
liko
kon
n de
deng
ngan k
an kad
adar r
ar ren
enda
dah
h (0
(0.5 ±
.5 ± 1.
1.5%
5%))
Kecep
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Besi Maleabel
Besi Maleabel
Bah
Bahan ba
an baku bes
ku besi cor p
i cor puti
utih
h
Perl
Perlakuan p
akuan panas terd
anas terdiri dar
iri dari grafiti
i grafitisasi dan
sasi dan
pendinginan
pendinginan
Pem
Pemben
bentuka
tukan gra
n grafit di ata
fit di atas
s
TTeutektoid
eutektoid
K
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Besi Nodular
Besi Nodular
Ka
Kand
ndun
unga
gan
n kar
karbo
bon 3
n 3 ±
± 4%
4%
Si
Sililikon
kon 1.
1.8 ±
8 ±
22.8%
.8%
S da
S dan P 10
n P 10x <<< b
x <<< besi cor
esi cor kelab
kelabu
u
Nodul
Nodule berbe
e berbentuk bol
ntuk bola pada proses sol
a pada proses solidifi
idifikasi akiba
kasi akibatt
penambahan Mg untuk menekan jumlah oksigen dan
penambahan Mg untuk menekan jumlah oksigen dan
S
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Besi Grafit
Besi Grafit
Kompak
Kompak
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3. Weldability of Cast Iron
3. Weldability of Cast Iron
B
B
esi
esi
cor
cor
Besi
Besi cor
cor putih
putih unw
unwelda
eldable
ble
Bes
Besi cor n
i cor nodu
odular i
lar is easi
s easier
er
to weld than grey
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Gambar 3.1 Skematik yang memperlihatkan zona temperatur pada pengelasan
Gambar 3.1 Skematik yang memperlihatkan zona temperatur pada pengelasan
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Weldability of iron
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Gambar 3.
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Jenis Elektrod
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