LAJU KOROSI HASIL PENGELASAN KOMBINASI BAJA ASTM A-36 YANG DI PREHEAT DAN PWHT MENGGUNAKAN AIR LIMBAH TPA DAN AIR SUNGAI MUSI

AMALIYADI, DIDI TRI and Pratiwi, Diah Kusuma (2018) LAJU KOROSI HASIL PENGELASAN KOMBINASI BAJA ASTM A-36 YANG DI PREHEAT DAN PWHT MENGGUNAKAN AIR LIMBAH TPA DAN AIR SUNGAI MUSI. Undergraduate thesis, Sriwijaya university.

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Abstract

Low carbon Steel is often used in the world of industry, automotive, construction, because it has properties that are resilient, capable of machining, forging, and good weldability. However, low carbon Steel has its own disadvantages, namely the low level of hardness and susceptibility to corrosion. Shield Metal Arc Welding (SMAW) is a type of welding that is often used and classified as economical compared to other types of welding, one of which is Gas Tungsten Arc Welding (GTAW) welding which has better quality than SMAW. In addition GTAW welding is more expensive than SMAW welding because it uses protective gas in the form of Argon or Helium. The protective gas used by GTAW can reduce oxidation thus it can minimize the defects that typically occur in weld metal. Fast cooling has a negative impact on physical and mechanical properties to overcome pre-heating is done before welding, namely Preheat and heating after welding, namely Post Weld Heat Treatment which also affects the results of the corrosion rate. This writing aims to assess the corrosion rate and physical and mechanical properties of the GTAW-SMAW combination joints that were treated with Preheat and Post Weld Heat Treatment. Welding is carried out on ASTM A- 36 Low Carbon Steel specimens with dimensions of 200 x 250 mm with a plate thickness of 19 mm for each connection. The weld position used is 1G or positioned under the hand. The connection type used is the Butt Joint by using open Single V and 150A for the current. Welding wire that was used was TG-S50 for Root Pass with GTAW method and RD-718 for Filler Pass by SMAW method. Each specimen was given a different treatment (ie one specimen without treatment, one with treatment using Preheat up to a temperature of 150°C, treated with Post Weld Heat Treatment at a temperature of 620°C, and the last specimen was given 2 treatments). After, Dye Penetrant was tested to see defects on the surface of the weld area before proceeding to testing Macro and Micro Metallography. Furthermore, some welded specimens were continued by testing Brinell and Rockwell hardness to determine the cross section hardness of the weld area and some of the specimens were continued by weighing heavily before one xvii corrosion. Afterwards the weighing is repeated again after corrosion. The result of testing the Chemical composition of the specimen was low carbon Steel with a carbon content of 0.21% with a Carbon Equivalent value of 0.5623 wt%. Dye Penetrant test results found defects that occurred in the preheat connection, namely spatter defects. On the connection without treatment and preheat + post weld heat treatment, there were porosity defects whereas the connection with post weld heat treatment had no defects. Corrosion test results on corrosive media of Musi River water and waste water, had the highest corrosion rate value in untreated specimens of 5.67 Mpy and 9.75 Mpy, while the lowest corrosion rate value is found in the preheat + post weld heat treatment specimen, were 4.20 Mpy and 4.58 Mpy. The results of the Brinell hardness test produced the highest hardness value in the untreated specimens of 190.17 BHN in the weld metal section, while the lowest hardness value in the preheat + post weld heat treatment specimen was 175.856 BHN. The results of the Rockwell hardness test produced the highest hardness value in the untreated specimens of 55 HRC in the weld metal section, while the lowest hardness value in the preheat + post weld heat treatment specimen was 43 HRC. Key Word : SMAW, GTAW, Preheat, Post Weld Heat Treatment, Corrosion. xviii

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	SMAW, GTAW, Preheat, Post Weld Heat Treatment, Korosi
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ241-254.7 Machine construction (General) > TJ241.I59 Machine design--Congresses. Production engineering--Congresses
Divisions:	03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User:	Ichlasyah Aisyah
Date Deposited:	06 Aug 2025 04:36
Last Modified:	06 Aug 2025 04:36
URI:	http://repository.unsri.ac.id/id/eprint/182405

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