Sifat Tarik dan Struktur Mikro Sambungan Las Gesek Tak Sejenis Baja-Tembaga

Ady Ryan Romadhan, Aris Widyo Nugroho, Totok Suwanda, Romi Wilza

Abstract


Abstrak

Tembaga dikenal memilki keunggulan sifat fisis sehingga sering diaplikasikan bersamaan dengan baja menggunakan teknik brazing yang membutuhkan filler. Friction welding memberikan alternatif penyambungan tak sejenis tanpa filler dan asap. Penelitian ini dilakukan untuk mengetahui efek tekanan gesek terhadap sifat mekanis sambungan las gesek pada sambungan dissimilar baja-tembaga. Silinder tembaga dan baja dibubut menjadi bentuk setengah bagian dari benda uji standar JIS Z 2201. Proses pengelasan dilakukan pada putaran 1000 rpm dengan variasi tekanan gesek sebesar 30, 35, dan 40 MPa dengan tekanan tempa 80 MPa. Waktu gesek dan waktu tempa masing-masing 5 detik. Hasil penyambungan masing-masing diamati struktur mikro, kekerasan dan sifat tariknya.  Hasil penelitian menunjukkan bahwa dengan meningkatnya tekanan gesek maka daerah TMAZ melebar. Struktur mikro berbutir halus teramati di bagian baja, sedangkan di daerah tembaga, orientasi butir berubah memanjang searah dengan permukaan sambungan. Pada daerah termomechanically affected zone (TMAZ) dan welding center zone (WCZ) kekerasan masing-masing logam turun seiring dengan kenaikan tekanan gesek. Lebar daerah TMAZ yang cukup membuat kekuatan tarik tertinggi diperoleh dari spesimen dengan variasi 35 MPa sebesar 89 MPa. Metode las ini dapat digunakan untuk penyambungan logam tak sejenis baja-tembaga dengan memperhitungkan luasan daerah TMAZ.


 Abstract

Copper is often used along with steel due to it excellence properties by using brazing technique. Friction welding technique offers an alternative technique for joining dissimilar metal without fillers and smoke. This research purpose is to study the effect of the friction pressure on the mechanical properties of steel-cooper friction welded joints. Copper and steel bars were turned into half the shape of the specimen according to JIS Z 2201. The welding process was carried out at a speed of 1000 rpm with the friction pressures of 30, 35, and 40 MPa under an upset stress of 80 MPa for 5 seconds of friction time and upset time. The results showed that with increasing friction pressure the TMAZ area was widened in fine grained microstructure for the steel region. Whereas in the copper region, the orientation of elongated grains inline with the direction of the joining surface. In the TMAZ and WCZ areas the hardness of each metal decreases with increasing friction pressure. The sufficient width of the TMAZ results in the highest tensile strength of 89 MPa. It was obtained from the specimens with friction pressure of 35 MPa. This welding method is potentially used for dissimilar steel-copper joint by considering the area of the TMAZ region.

Keywords: Friction welding, dissimilar metals joint, pressure friction, TMAZ


Keywords


Friction welding, sambungan logam dissimilar, tekanan gesek, TMAZ

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References


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DOI: https://doi.org/10.18196/jmpm.3133

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