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ITS » Non Degree » Teknik Bangunan Kapal
Posted by ansi@its.ac.id at 06/07/2011 15:26:29  •  976 Views


PENGARUH BESARNYA ARUS PENGELASAN FILLET JOINT (T-JOINT ) TERHADAP STRUKTUR MIKRO DAN KEKERASAN PADA MATERIAL ALUMINIUM 5083 DENGAN PROSES GTAW

WELDING FILLET JOINT ( T-JOINT ) FLOW EFFECT TO MICRO STRUCTURE AND HARDNESS ON ALUMINIUM 5083 BY GTAW PROCESS

Created by :
ZULKHAMDI, AKHMAD HARIS ( 6207030002 )
ARDHANA, MURBAYU



Subjectpengelasan
Alt. Subject Gas tungsten arc welding
KeywordPengelasan GTAW
Arus
Struktur Mikro
Kekerasan

Description:

Material paduan aluminium 5083 adalah material yang memiliki ketahanan korosi yang baik dan mempunyai sifat mampu las serta banyak digunakan untuk tangki – tangki LNG, bejana tekan temperatur rendah, peralatan kelautan dan rangka bangunan. Pada pengelasan aluminium, parameter arus sangat diperhatikan, karena besar kecil arus pengelasan mempengaruhi dari hasil las sehingga menyebabkan perubahan struktur mikro dan sifat mekanik daerah las. Secara umum arus pengelasan sudah ditentukan sesuai spesifikasi elektroda yang dipakai 115 A – 140 A. Untuk mengkaji hal tersebut disusunlah sebuah konsep penelitian tentang pengaruh besar kecilnya variable arus pada pengelasan paduan aluminium 5083 dengan proses pengelasan GTAW ( Gas Tungsten Arc Welding ). Dalam penelitian ini menggunakan elektroda tungsten EWZr-1 ø 2,4 mm dan elektroda ER5356 ø 3,2 mm sebagai elektroda terumpan serta memakai gas pelindung argon. Variable arus yang digunakan adalah 110 A, 130 A dan 150 A, dari ketiga variasi arus tersebut dilakukan pengujian struktur mikro dan kekerasan. Pengujian struktur mikro menggunakan ASME standart sebagai acuan untuk ukuran spesimen dan pengujian struktur mikro menggunakan ATLAS of microstructure sebagai acuan untuk menentukan jenis kandungan. Dari hasil pengujian menunjukkan bahwa variable arus pengelasan aluminium 5083 mempengaruhi kekerasan, karena semakin besar arus yang digunakan kekerasan yang dihasilkan semakin tinggi. Hal ini terlihat pada arus pengelasan 150 A, yang memiliki nilai kekerasan tertinggi pada daerah WM, yaitu sebesar 69,197 HV untuk tebal spesimen 6 mm dan 10 mm sebesar 73,316 HV. Pada arus 130 A memiliki kekerasan sedang, yaitu 68,556 HV dan 72,055 HV, sedangkan dengan arus 110 A memiliki kekerasan terendah, yaitu 67,429 HV dan 70,138 HV. Dari pengujian struktur mikro didapatkan hasil bahwa semakin tinggi arus yang digunakan dalam proses pengelasan, maka semakin besar ukuran butir yang dihasilkan khususnya pada daerah WM. Sedangkan pada daerah HAZ butiran yang kecil dihasilkan pada arus pengelasan 110 A, dan pada daerah BM tidak banyak mengalami perubahan.


Alt. Description

5083 aluminum alloy material is material that has good corrosion resistance and weldability properties have also been used to tank - the tank of LNG, a low temperature pressure vessels, marine equipment and frame buildings. In aluminum welding, the flow parameters are all concerned, because the large influence of small welding current welds causing changes in the microstructure and mechanical properties of weld area. In general, welding current have been determined to meet specifications used electrodes 115 A - 140 A. To look into the matter formulated a concept study on the effect of variable size of the current in the welding of aluminum alloy 5083 with welding processes GTAW (Gas Tungsten Arc Welding). In this study, using tungsten electrodes EWZr-1 ø 2.4 mm and 3.2 mm ø ER5356 electrodes as electrodes terumpan and using argon shielding gas. Variable flow used was 110 A, 130 A and 150 A, of the three variations of the flow testing of microstructure and hardness. Testing micro structure using ASME standards as a reference to the size of specimens and testing micro structure using ATLAS of microstructure as a reference to determine the type of content. The results show that the 5083 aluminum welding variables affect the flow of violence, because the higher current used produced the higher hardness. This can be seen on the welding current 150 A, which has the highest hardness values in the WM region, amounting to 69.197 HV for specimens 6 mm thick and 10 mm at 73.316 HV. In the current was 130 A has violence, ie 68.556 72.055 HV and HV, whereas the current 110 A has the lowest hardness, ie 67.429 and 70.138 HV HV. From the microstructure examination showed that the higher currents used in the welding process, the greater the grain size produced in particular in WM regions. While at small grain HAZ region resulted in the welding current 110 A, and the BM region not undergo much change.

Contributor:
  1. Usman Dinata, ST. MM
  2. Tri Karyono, ST. MT
Date Create:01/09/2010
Type:Text
Format:pdf
Language:Indonesian
Identifier:ITS-NonDegree-3100011042434
Collection ID:3100011042434
Call Number:RSPP 671.522 Zul p


Source :
Non Degree Thesis, Ship Building Engineering, RSPP 671.522 Zul p, 2010

Coverage :
ITS Community

Rights :
Copyright @2010 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library


Publication URL :
http://digilib.its.ac.id/pengaruh-besarnya-arus-pengelasan-fillet-joint-tjoint--terhadap-struktur-mikro-dan-kekerasan-pada-material-aluminium-5083-dengan-proses-gtaw-14972.html




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