PENGARUH TEMPERATUR PADA PENGELASAN DIFUSI LOGAM LAS TAK SEJENIS ANTARA ALUMINIUM DAN BAJA DENGAN METODE THERMAL SPRAY

NURISNA, ZUHRI (2016) PENGARUH TEMPERATUR PADA PENGELASAN DIFUSI LOGAM LAS TAK SEJENIS ANTARA ALUMINIUM DAN BAJA DENGAN METODE THERMAL SPRAY. Masters thesis, Universitas Sebelas Maret.

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    Abstract

    Joining of aluminum alloy to steel is a great challenge because of the large differences in thermo-physical properties between the two metals. Moreover, the differences of melting point causes the material is not easy to fusion at weld area. Furthermore, the formations of brittle Fe–Al intermetallic compounds (IMCs) at elevated temperatures has a detrimental effect on the mechanical properties, especially the tensile strength of the welded structures. In this study, the formations of IMC can be avoided by using nickel interlayer. The aluminum and steel specimens were bonded by diffusion method using hot press. Nickel interlayer were added on steel surface by thermal spray method. The thickness of nickel interlayer were in range from 0.2 mm to 1.0 mm. The temperature of diffusion welding were in range from 500oC to 550oC. Two different treatment, interlayer thickness and temperature of diffusion welding, were conducted to investigate their effect on the IMC formation. The IMC was examined under scanning electron microscope with EDX attachment. The thickness of the IMC layer increased with increasing temperature of diffusion welding. The IMC formation was formed two different types of IMC. Al3Ni dominant formed on the first layer of IMC. When the thickness of Al3Ni layer reaches a critical value, the formation of the next layer of IMC are dominant formed Ni-Al. The highest tensile shear strength is resulted at 525oC welding temperature. While the treatment of interlayer thickness are no affected on the formation of IMC. Hardness at Ni-Al interface higher than the Fe-Ni interface, this is due to the formation of IMC at Ni-Al interface. The addition of the Ni interlayer succesfully to avoided the formation of Fe–Al intermetallic compounds. Diffusion area formed more powerful, so it can improve the tensile shear strength of steel and aluminum.

    Item Type: Thesis (Masters)
    Subjects: R Medicine > R Medicine (General)
    Divisions: Pasca Sarjana
    Pasca Sarjana > Magister
    Depositing User: Afifah Nur Laili
    Date Deposited: 12 Jun 2016 06:28
    Last Modified: 12 Jun 2016 06:28
    URI: https://eprints.uns.ac.id/id/eprint/27018

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