PERBEDAAN SIFAT MEKANIK DAN SIFAT FISIK STAINLESS STEEL 316 AKIBAT DILAS DENGAN BUTT JOINT DAN LAP JOINT MENGGUNAKAN SMAW

BUKHORI, MGS AHMAD and Pratiwi, Diah Kusuma (2016) PERBEDAAN SIFAT MEKANIK DAN SIFAT FISIK STAINLESS STEEL 316 AKIBAT DILAS DENGAN BUTT JOINT DAN LAP JOINT MENGGUNAKAN SMAW. Undergraduate thesis, Sriwijaya university.

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Abstract

Stainless Steel 316 is a metal alloy that has a lot of advantages, such as the corrosion resistance level is very high, but there are some problems in implementing stainless Steel welding, which are the losses of anti-corrosive in the HAZ area, and the very rapid cooling causes the weld region becomes hard and brittle. the aim of this research is to examine the changes that happen in the microstructure and mechanical properties of welded stainless Steel 316 with butt joint dan lap joint before and after welding. Welding is performed using the bevel V and position 1G for butt joint and 2F for lap joint. Both the welding processes use the same current of 110 A. After testing it using visual die penetrant, the specimens are tested using NDT with ultrasonic to determine the quality of the welding. For the mechanical testing, tensile test, bending test, and hardness test is performed, whereas for physical testing, analysis is done using macro, micro and SEM (Scanning Electron Microscopy). The test results by using die penetrant shows that there are many defects on the surface of the lap joint welding like spatter, incomplete fusion, and porosity, for the butt joint there is no visible defects on the surface. This is because the lap joint welding process is done with fillet shaped weld. In hardness test, the lap joint welding has the average value of hardness 89 HRB on the welding area and for butt joint welding the average hardness is 83 HRB on the welding area. In tensile test, it breaks in the base metal region for both connection methods. The butt joint has an average tensile strength of 42,16 kgf/mm2and for lap joint it is 49,81 kgf/mm2 this is because the base metal in the butt joint has a lower hardness than the base metal for the lap joint. Because the broken location occurs on the base metal, we can not use tensile test to get the value of the tensile strength for the weld area, then we can use the table of relationship between hardness and tensile stress, so that on the tabel we can determine the tensile stress of the butt joint is 56,08 kgf/mm2 and for tensile lap joint is 61,69 kgf/mm2 .In bending test the average bending stress is 71,07 kgf/mm2 for the butt joint and for the lap joint an average bending stess is 75,26 kgf/mm . In metallography test, it is seen that the microstructure of lap joint is more tough than the microstructure of the butt joint, this is due to the microstructure of lap joint is more subtle than microstructure butt joint. In SEM testing, it is done only on the area of butt joint welding and base metal butt joint, SEM testing for the lap joint can not be performed because there is no broken part in the welding area. In the SEM testing, there are the dimple mode in the welding area and it shows sigma phase contained in the grain boundaries after enlargement, whereas for the base metal contained striations mode showing the direction of the fracture inward, and in other places there is a dimple mode. Keyword : Stainless Steel, SMAW, Butt Joint, Lap Joint, Mechanical Properties, Physical Properties. Citations : 15.,( 1992-2015)

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Stainless Steel, SMAW, Butt Joint, Lap Joint, Sifat Mekanik, Sifat Fisik
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:	09 Sep 2025 02:52
Last Modified:	09 Sep 2025 02:52
URI:	http://repository.unsri.ac.id/id/eprint/183746

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