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Asfarizal Asfarizal
Institut Teknologi Padang
Mechanical Engineering

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ANALISIS KEKERASAN PERLAKUAN PANAS BAJA PEGAS DENGAN PENDINGINAN SISTEM PANCARAN PADA TEKANAN 20, 40 DAN 60 PSi Asfarizal Asfarizal; Suhardiman Suhardiman
Jurnal Teknik Mesin (JTM) Vol 2, No 1 (2012)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

In the heat treatment with rapid dye method (Quenching) has the disadvantage that the increase of water temperature around the metal is high enough, it is not suitablefor long material, this issue need another attempt to study the cooling method with spraying system which is done to the spring steel. Heating is done until temperature of 920 ° C, with holding time 60 min, pressure 20, 40, 60 psi and 120 seconds of spraying time. After heat treatment, the specimens' hardness is tested by the method of Rockwell C (HRC). The results of hardness testing showed that the average hardness at a pressure of 20, 40, 60 psi is 34.55 HRC, HRC 39.80, and 40.45 HRC. At a pressure of 60 psi martensiticphase is observed clearly. There is a tendency that the higher the pressure, the hardness increased.
PENGARUH VARIASI MEDIA PENDINGIN HASIL SAMBUNGAN LAS BAJA PADUAN TERHADAP NILAI KETANGGUHAN Asfarizal Asfarizal; Rony Richardo
Jurnal Teknik Mesin (JTM) Vol 1, No 1 (2011)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

The welding SMAW has processed in high temperature (1500oC) and variation of cooling methode will give differences of value impact. The research is weld for steel alloy with three variation lap joint (I, U, V) and three cooling media (air, sea water and oil). The analysis and solution of the research conclude that weld joint by using seam V, U and I, has the highest impact in energy and value within the air cooling media. This lap joint inclined to ductile. The lap joint in the cooling media of sea water and oil has low impact in energy and value. This lap joint inclined to brittle.
Co-Authors Rony Richardo Suhardiman Suhardiman