Abstract
<em>The optimum properties of aluminum can be achieved by the addition of alloy and heat treatment. An experimental study was conducted to investigate the effect of the oxy-acetylene mixture on the flame heating process on the physical and mechanical properties of aluminum 7075. Aluminum was heated to 480° C using an oxy-acetylene flame and then cooled rapidly. Then the results were compared with the specimen with flame heating + aging treatment. Variations of oxygen and acetylene mixtures were 0.75, 0.875 and 1 liter/min. The distance of the torch to the specimen's surface is 3 cm and the water flow rate is 1400 cc/min. The aging process is carried out with a temperature of 120°C for 3 hours + 165 for 1 hour. The results showed that the highest hardness value in flame heating treatment was 143,10 HVN with acetylene variation 0,875 liter/minute. The result of the impact test does not change much from the initial material toughness value, due to the average flame heating time that is not too long.</em>
Highlights
The optimum properties of aluminum can be achieved by the addition of alloy and heat treatment
The results showed that the highest hardness value in flame heating treatment was 143,10 HVN with acetylene variation 0,875 liter/minute
Spesimen aluminium yang telah diproses flame heating dengan debit asetilen 0,75 Liter/menit, nilai kekerasannya 151,62 HVN
Summary
The optimum properties of aluminum can be achieved by the addition of alloy and heat treatment. Sehingga penelitian ini akan membahas tentang pengaruh variasi campuran oksi-asetilen pada pengerasan lokal terhadap sifat fisis dan mekanik Al seri 7075 menggunakan metode flame heating serta fenomena yang terjadi ketika proses berlangsung. Proses Penelitian Proses awal flame heating dilakukan dengan meletakkan spesimen aluminium 7075 pada backing plate dengan jarak 3 cm dari permukaan spesimen hingga ujung torch, seperti yang terlihat pada Gambar 1.
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