PENGARUH PENAMBAHAN FLUX AKTIF (TiO2)

TERHADAP HASIL KEKERASAN PENGELASAN

FCAW PADA MATERIAL BAJA A 36

Skripsi

Diajukan Kepada Universitas Muhammadiyah Malang

Untuk Memenuhi Salah Satu Persyaratan Akademik

Dalam Menyelesaikan Program Sarjana Teknik

Disusun Oleh :

NAILURRAHMAN

201510120311099

JURUSAN TEKNIK MESIN

FAKULTAS TEKNIK

UNIVERSITAS MUHAMMADIYAH MALANG

2020

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DAFTAR ISI

COVER ................................................................................................................... i

POSTER ................................................................................................................. ii

LEMBAR PENGESAHAN SKRIPSI .............................................................. iii

TANDA TANGAN BERITA ACARA BIMBINGAN ..................................... iv

SURAT PERNYATAAN KEASLIAN ............................................................. vi

ABSTRAK ........................................................................................................ vii

ABSTRACK .................................................................................................... viii

KATA PENGANTAR ....................................................................................... ix

DAFTAR ISI .................................................................................................... xii

DAFTAR TABEL ........................................................................................... xiv

DAFTAR GAMBAR ........................................................................................ xv

BAB I PENDAHULUAN ................................................................................... 1

1.1 Latar Belakang............................................................................................ 1

1.2 Rumusan Masalah ....................................................................................... 3

1.3 Tujuan Penelitian ........................................................................................ 3

1.4 Batasan Masalah ......................................................................................... 3

1.5 Hipotesa ..................................................................................................... 4

1.6 Metode Penelitian........................................................................................... 4

1.7 Sistematika Penilisan...................................................................................... 5

BAB II LANDASAN TEORI ............................................................................. 7

2.1 Tinjauan Pustaka......................................................................................... 7

2.2 FCAW (Flux Core Art Welding) ............................................................... 10

2.3 Baja ASTM 36 .......................................................................................... 14

2.4 Flux aktif TiO2 .......................................................................................... 16

2.5 Kawat Elektroda ...................................................................................... 17

2.6 Uji Kekerasan ........................................................................................... 19

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BAB III METODOLOGI PENELITIAN ....................................................... 24

3.1 Jenis Penelitian ........................................................................................ .24

3.2 Waktu Dan Tempat Penelitian .................................................................. 24

3.3 Alat dan Bahan Penelitian ......................................................................... 24

3.3.1 Bahan ....................................................................................................... 24

3.3.2 Alat .......................................................................................................... 26

3.4 Langkah Penelitian .................................................................................. 31

3.4.1 Tahap Persiapan ........................................................................................... 31

3.5 Proses Pengelasan ........................................................................................ 32

3.6 Analisa Data ................................................................................................ 35

3.7 Diagram Alir ................................................................................................ 36

BAB IV HASIL PENELITIAN DAN PEMBAHASAN .................................. 37

4.1 Proses Pengujian ....................................................................................... 37

4.2.1 Hasil Pengujian Kekerasan Vickers .......................................................... 38

4.3 Pembahasan .............................................................................................. 44

BAB V PENUTUP ........................................................................................... 48

5.1 Kesimpulan............................................................................................... 48

5.2 Saran ........................................................................................................ 48

DAFTAR PUSTAKA ....................................................................................... 49

LAMPIRAN

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DAFTAR TABEL

Tabel 2.1 Komposisi Elektroda berdasarkan AWS A5.20 ................................... 17

Tabel 2.2 Skala Kekerasan ................................................................................ 19

Tabel 2.3 Uji Kekeraan Vikers .......................................................................... 22

Tabel 2.4 Skala Kekerasan Rockwell ................................................................ 24

Tabel 4.1 tabel hasil kekerasan pengelasan FCAW tampa TiO2 .......................... 37

Tabel 4.2 tabel hasil kekerasan pengelasan dengan TiO2 0,5 gr .......................... 38

Tabel 4.3 tabel hasil kekerasan pengelasan dengan TiO2 1 gr ............................. 40

Tabel 4.4 tabel hasil kekerasan pengelasan dengan TiO2 1,5 gr .......................... 41

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DAFTAR GAMBAR

Gambar 2.1 Skema Pengelasan FCAW ............................................................. 10

Gambar 2.2 Posisi Pengelasan Proses ................................................................ 11

Gambar 2.3 Struktur TiO2 ................................................................................. 16

Gambar 2.4 Indentor Uji Vickers ...................................................................... 18

Gambar 2.5 Skema Uji Rockwell ...................................................................... 20

Gambar 2.6 Indentor Uji Brinell ........................................................................ 21

Gambar 3.1 Fluks Aktif TiO2 ............................................................................ 24

Gambar 3.2 Aseton ........................................................................................... 25

Gambar 3.3 Mesin Las FCAW .......................................................................... 25

Gambar 3.4 Alat uji kekerasan vikers ................................................................ 26

Gambar 3.5 Jangka Sorong .............................................................................. 27

Gambar 3.6 Gelas Kimia ................................................................................... 27

G2ambar 3.7 Spatula pengaduk ............................................................................. 27

Gambar 3.8 Timbangan Digital ........................................................................ 28

Gambar 3.9 Gerinda .......................................................................................... 28

Gambar 3.10 Mesin Potong Hidrolik .................................................................. 29

Gambar 3.11 Amplas ........................................................................................ 29

Gambar 3.12 Penjepit Material Saat Pengelasan ..................................................29

Gambar 3.13 Kampuh Join .................................................................................. 31

Gambar 3.14 Proses Pengelasan ...................................................................... ..... 28

Gambar 3.15 Penambahan TiO2 ........................................................................... 32

Gambar 3.16 Hasil Pengamplasan Spesimen ........................................................ 33

Gambar 4.1Kampuh V 30º ................................................................................ 36

Gambar 4.2 Pengambilan Titik Sampel ............................................................. 37

Gambar 4.3 Grafik Hasil Uji Kekerasan .............................................................. .43

Gambar 4.4 Grafik Rata-rata Daerah HAZ, BN,WM........................................... .43

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