PERUBAHAN SIFAT FISIK DAN MEKANIK SAMBUNGAN LAS BUTT JOINT BERDASARKAN VARIASI KAMPUH DAN TEBAL PELAT MENGGUNAKAN LAS SMAW PADA ARUS 110 A

SIHOMBING, YOPE KORINTUS and Pratiwi, Diah Kusuma (2017) PERUBAHAN SIFAT FISIK DAN MEKANIK SAMBUNGAN LAS BUTT JOINT BERDASARKAN VARIASI KAMPUH DAN TEBAL PELAT MENGGUNAKAN LAS SMAW PADA ARUS 110 A. Undergraduate thesis, Sriwijaya university.

	Text RAMA_21201_03121005024.pdf - Accepted Version Restricted to Repository staff only Available under License Creative Commons Public Domain Dedication. Download (58MB) | Request a copy
	Text RAMA_21201_03121005024_0019076305_01 front ref.pdf - Accepted Version Available under License Creative Commons Public Domain Dedication. Download (12MB)
	Text RAMA_21201_03121005024_0019076305_02.pdf - Accepted Version Restricted to Repository staff only Available under License Creative Commons Public Domain Dedication. Download (5MB) | Request a copy
	Text RAMA_21201_03121005024_0019076305_03.pdf - Accepted Version Restricted to Repository staff only Available under License Creative Commons Public Domain Dedication. Download (8MB) | Request a copy
	Text RAMA_21201_03121005024_0019076305_04.pdf - Accepted Version Restricted to Repository staff only Available under License Creative Commons Public Domain Dedication. Download (25MB) | Request a copy
	Text RAMA_21201_03121005024_0019076305_05.pdf - Accepted Version Restricted to Repository staff only Available under License Creative Commons Public Domain Dedication. Download (515kB) | Request a copy
	Text RAMA_21201_03121005024_0019076305_06 ref.pdf - Bibliography Restricted to Repository staff only Available under License Creative Commons Public Domain Dedication. Download (823kB) | Request a copy
	Text RAMA_21201_03121005024_0019076305_07 lamp.pdf - Accepted Version Restricted to Repository staff only Available under License Creative Commons Public Domain Dedication. Download (5MB) | Request a copy

Abstract

Welding helping people that work in the construction of metal joining which include general construction, Steel construction, and machinery construction, and others. As the development of technology affect the development of production and construction for the increasing human needs who demand a guarantee the strength of construction. In the metal joining using welding method consideration groove welding and thickness of the plate as a basis for comparison of physical and mechanical properties with butt joint. Using shield metal arc welding (SMAW) as a welding type is the simple welding equipment and easy to work. Research chronology are beginning from literature study based from joumal, book, and other citation that support the research. At the same time conducting the literature study, starting welding process that begins from cutting and groove welding preparation of low carbon Steel plate 6 mm and 3.2 mm thickness. The next stage is the welding process, SMAW type on the 110 A current. After the welding process, continued by Chemical composition testing by using PMI Master Pro made in Oxford Instruments Analytical GmbH Wellesweg 31 held in PT. Pupuk Sriwidjaja. The Chemical composition test result obatained 6 mm thickness plate containing carbon at 0.163% and 3.2 mm thickness plate containing carbon at 0.0899%. this result indicate the type of Steel that welded is low carbon Steel. After Chemical composition testing, non-destructive test performed by using a liquid dye penetrant. The purpose of this test is to show the defects on the surface of the joined area that is not visible by human eye. Non-destructive test carried out in two stages, the first after welding process and after the welding joined area levelled. The result indicates there defect such as porosity, spatter and undercut. After non-destructive test, furthermore macrostructure test. The purpose of this test to show the boundary of between weld area and heat affected zone (haz), and the boundary of between HAZ and base metal. To show those boundary, use the macro etching fluid with the composition of 38 mL HC1, 12 mL H2SO4, 50 mL H2O at the temperature 70° - 82°C in a way the specimen has been grinded to 800 grit and shiny surface, immerse in to the etching liquid for 20 minutes. This test result show the weld area in the grey area, meanwhile HAZ is lighter than base metal and located on the edge of the weld metal. After macrostructure test, carried hardness testing using Vickers method with the value of specimen against localized plastic deformation. This Vickers hardness testing result obtained the highest hardness value is in the weld metal both on the double V groove welding with 6 mm thickness at 250 VHN and 3.2 mm thickness at 253 VHN. After vickers hardness test, followed microstructure test using a optical microscope with STM - LM model made in Olympus Optical CO.,LTD. The purpose of microstructure test is to view the grain boundaries and the grain transformation that occur in the joined area. By using Nital 2% liquid etching, obtained the structure of ferrite and pearlite in the base metal. The widmanstatten ferrite in the heat affected zone (HAZ) area. The structure of acicular ferrite and ferrite grain boundary in the weld metal area. Followed by bending testing using Torsee Universal Testing Machine with RAT - 30P type. The machine reference to JIS Z 2248 for testing method and JIS Z 2204 for dimension and shape of specimen. This bending test result obtained the highest bending stress value on the double V groove welding 6 mm thickness at 46 kgf/mm2 both in the weld area and root area, and 3.2 mm thickness at 43 kgf/mm2 in the weld area and 46 kgf/mm2 in the root area. Furthermore scanning electron microscope test (SEM). This SEM test show the image in high resolution and three-dimentional image with magnification up to 1000000 times. This test using FEI Company machine type Inspect S50 held in Manufacture Polytechnic of Bangka Belitung. SEM test performed on specimen with the lowest and the highest bending stress value. The result of SEM test showed the specimen at the lowest bending stress value on the 6 mm and 3.2 mm thickness there are inclusion defect that trapped in the weld metal. SEM result for specimen with the highest bending stress value at 6 mm thickness showed porosity defect in the weld metal. This defect indicates that 110 A current for 6 mm thickness produce lumpy liquid weld metal, so that involve uneven when weld metal solidification. SEM result for 3.2 mm showing the fracture mode refers to dimple rupture. This rupture indicates that the fracture means the properties of the specimen is ductile. The result of this study indicate that the best of physical properties and mechanical properties at the double V groove welding joint. Keywords : S MA W Welding Method, Groove Weld, Butt Joint, Hardness Testing, Bending Testing, Scanning Electron Microscopy. Citations : 22 (1980-2015)

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Las S MA W, Kampuh Las, Butt Joint, Kekerasan, Tegangan Lengkung, Scanning Electron Microscopy
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1-1570 Mechanical engineering and machinery
Divisions:	03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User:	Ichlasyah Aisyah
Date Deposited:	08 Sep 2025 01:00
Last Modified:	08 Sep 2025 01:00
URI:	http://repository.unsri.ac.id/id/eprint/183624

Actions (login required)

View Item