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ITS » Paper and Presentation » Teknik Pengelasan
Posted by tondoindra@gmail.com at 15/10/2012 08:56:54  •  1378 Views


ANALISIS PENGARUH MULTIPLE REPAIR WELDING PADA BAJA PADUAN RENDAH TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO

ANALYSIS OF LOW ALLOY STEEL OF MULTIPLE REPAIRS WELDING EFFECT ON MECHANICAL PROPERTIES AND MICRO STRUCTURE

Author :
ULUM, MIFTAHUL ( 6707040009 )




ABSTRAK

Kemungkinan terjadi kesalahan dalam proses pengelasan tidak dapat dihindari dan berakibat fatal bagi komponen. Hal tersebut dapat terjadi akibat human error atau kesalahan prosedur. Untuk mengatasinya diperlukan perlakuan repair apabila kesalahan dalam proses pengelasan dilakukan berulang kali maka perlu dilakukan Multiple Repair Welding pada sambungan las tersebut. Akibat dari Multiple Repair Welding yang dilakukan akan berpengaruh besar terhadap sifat mekanik dan struktur mikronya. Dalam penelitian ini menggunakan material plat A 572 Gr. 50 dengan dimensi 280 x 280 x 21mm. Proses pengelasan dilakukan dengan metode SMAW pada posisi 1G datar dengan elektroda AWS E-7018 serta diberikan preheat 150 0C dan back weld untuk bagian akarnya. Dalam pelaksanaan uji tarik nilai kekuatan tarik tanpa repair sedikit lebih tinggi dibandingkan dengan kekuatan tarik hasil lasan dengan repair 1X sampai dengan 3X secara berturut-turut sebesar 554.80 MPa 546.14 MPa 549.56 MPa dan 547.36 MPa. Sedangkan seluruh pola perpatahan pada spesimen impact adalah 100 ulet kecuali pada spesimen material repair 3X di weld metal muncul pola perpatahan getas. Melalui pengamatan struktur makro didapatkan prosentase luasan HAZ material repair 1X 2X dan 3X dibandingkan material tanpa repair yaitu 0.05 15 dan 61. Hal ini berbanding lurus dengan hasil pengamatan struktur mikro didapatkan prosentase grain size pada HAZ material repair 1X 2X dan 3X dibandingkan material tanpa repair yaitu 0.05 7 dan 16.5. Dari semua pengujian diatas menandakan bahwa semakin banyak material mengalami repair pengelasan sifat mekanik dan struktur mikronya semakin menurun.


ABSTRACT

The possibility of error in the welding process cant be avoided and could be fatal to the structure. Of these situations can occur due to human error and wrong procedure. Treatment necessary to repair it if the errors in the welding process is then repeated to perform multiple weld repair at the joint. As a result of multiple repairs carried out will greatly affect the mechanical properties and microstructure. In this research using A 572 Gr. 50 with dimension 280 x 280 x 21 mm. Welding job done SMAW method on the position 1G flat with using electrode AWS E-7018 with preheat 1500C and back weld on the root. In the tensile tests tensile strength values non repair welding results slightly higher than the tensile strength of welded with repair 1x to 3x respectively for 554.80 MPa 546.14 MPa 549.56 MPa and 547.36 MPa. Whereas all fracture in the impact test are 100 ductile except in 3X repairs weld specimens that are brittle fracture. Through the observation of metallography structure of the macro wide of area HAZ procentage from specimen 1X 2X and 3X compare non repair such as 0.05 15 and 61. Its related to the micro-structures observation taken grain size procentage of HAZ from specimen 1X 2X and 3X compare non repair such as 0.05 7 and 16.5. All of this indicates that increasing amount of repair welding processes that have done it will be decreasing mechanical properties and micro-structures values.



KeywordsMultiple repairs; mechanical properties; metallography; HAZ; grain size
 
Subject:  Las
Contributor
  1. Ir. Gathot Dwi Winarto, MT.
  2. Moh. Thoriq W, ST., MM.
Date Create: 15/10/2012
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-paper-67021120000974
Collection ID: 67021120000974
Call Number: 671.52 Ulu a


Source
Paper and Presentation of ,Welding Engineering,671.52 Ulu a, 2012

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Copyright @2011 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




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ITS-paper-67021120000974-21457.pdf




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