Analisis Pengaruh Variasi Filler Berbasis Nikel dan Post-Weld Heat Treatment (PWHT) Terhadap Struktur Mikro dan Sifat Mekanik pada Hasil Lasan MIG Cast Iron FCD 450 Komponen Axle Hub HD785-7

Yogasara, Ferdiyan Alfathan (2018) Analisis Pengaruh Variasi Filler Berbasis Nikel dan Post-Weld Heat Treatment (PWHT) Terhadap Struktur Mikro dan Sifat Mekanik pada Hasil Lasan MIG Cast Iron FCD 450 Komponen Axle Hub HD785-7. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu komponen axle hub unit HD785-7 terbuat dari material ductile cast iron FCD 450 mengalami crack pada bagian studbold dikarenakan faktor beban berlebih (overload) atau lifetime, diperlukan proses repair dengan metode pengelasan. Cast iron memiliki weldability yang rendah, maka dibutuhkan parameter yang tepat untuk mengelas komponen tersebut. Tujuan dilakukannya penelitian ini untuk mengetahui pengaruh struktur mikro dan sifat mekanik hasil pengelasan menggunakan metode Metal Inert Gas (MIG) dengan variasi filler berbasis nikel dan Post-Weld Heat Treatment (PWHT). Parameter las yang digunakan antara lain arus 150 A, tegangan 26 V, komposisi gas argon 100%, preheat 250 °C, dan polaritas DCEP. Dengan variasi filler yaitu NiFe, NiFe-1, dan NiFe-2. Setelah itu dilakukan PWHT menggunakan furnace pada temperature 595 °C dengan holding time 60 menit, lalu pendinginan furnace sampai 350 °C, setelah itu pendinginan udara sampai temperatur ruangan. Beberapa pengujian yang dilakukan yaitu uji visual, uji makroskopik, uji mikroskopik, uji kekerasan, dan uji tarik. Hasil pengujian menunjukkan pengelasan dengan filler NiFe dengan perlakuan PWHT memiliki distribusi fasa yang teratur dan seragam dalam struktur mikronya, dan kekerasan yang dimiliki paling tinggi dari filler lainnya, yaitu 229,86 HV pada daerah weld metal dan 230,74 HV pada daerah HAZ, serta memiliki nilai Ultimate Tensile Strength (UTS) paling tinggi, yaitu 283,7 MPa. =============== One of component in axle hub unit HD785-7 made from ductile cast iron FCD450 material have crack on the studbold due to overload or lifetime. Therefore it is necessary to repair process need welding method. Cast iron have a poor weldability, so it takes a good parameter to weld the component. The purpose of this research is to know the effect of micro structure and mechanical properties of welding using Metal Inert Gas (MIG) method with nickel-base filler and Post-Weld Heat Treatment (PWHT). The welding parameters use 150 A, 26 V, 100% argon gas composition, preheat 250 ° C, and DCEP polarity. Methods were done by filler variations of NiFe, NiFe-1, and NiFe-2. After that, for the PWHT using furnace at temperature 595 ° C and holding time 60 minutes, then they were cooled in furnace to 350 ° C, last cool air to room temperature. Some of the tests that performed were visual test, microstructure test, hardness test, and tensile test. Some of the tests performed were visual test, microstructure test, hardness test, and tensile test. The results showed that welding by NiFe filler with PWHT treatment have a regular and uniform phase distribution in microstructure, and the highest hardness of other fillers is 229,86 HV in weld metal and 230,74 HV in HAZ area, and have a highest value of UTS, i.e. 283.7 MPa.

Item Type: Thesis (Undergraduate)
Additional Information: RSMt 671.522 Yog a-1
Uncontrolled Keywords: Ductile Cast Iron, MIG, NiFe, Pengelasan, PWHT, ductile cast iron, MIG, NiFe, PWHT, welding
Subjects: T Technology > TS Manufactures
T Technology > TS Manufactures > TS227 Welding.
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Ferdiyan Alfathan Yogasara
Date Deposited: 18 Dec 2018 03:27
Last Modified: 18 Dec 2018 03:27
URI: http://repository.its.ac.id/id/eprint/53269

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