This study aims to determine the various effect of heat input due to varied electric current on microstructure of the weld joints and the bending strength of 2 dissimilar metals (aluminum alloy 5052 and galvanized steel) with Al-Si 4043 as filler. This experimental research was worked out by varying the strength of the current which can then be calculated into a heat input. The current inputs applied were 30.8 J / mm (70A), 35.2 J / mm (80A) and 39.6 J / mm (90A) while the protective gas flow rate used is 14 liters / minute. This study showed that the increase in heat input greatly affects the shape of the weld area microstructure, i.e. the microstructure and bending strength. Greater heat input due to higher current can melt larger area, so that the join process occured better. The highest bending strength at 9.05 Mpa was achieved for heat input at 39.6 J / mm or strong current of 90 A. The weakest bending strength at 8.88 Mpa was achieved for heat input at 35.2 J / mm or a strong current of 70 A.
Many studies have had been done relating to the Bunsen burner. However there are only a handful of studies which focus on the implementation of a foreign component integrated to a Bunsen burner. Therefore, the effect of such component to the Bunsen burner still need to be investigated further. The study proposes a further analysis on the effects of a ring, primarily its temperature, on the Bunsen burner to the flame characteristic of methane gas. Flame’s temperature, flame’s height, and laminar flame speed are the 3 key properties observed. The study is done using a computer based numerical simulation software Ansys, implementing a 2D Fluent steady state analysis. The variations are the value of the ring’s temperature, which are 400 K, 600 K, and 800 K. The result of the study suggests that for the same equivalence ratio value, the higher the temperature of the ring attached to the burner, resulting in a higher flame’s temperature and laminar flame speed value. Proven by the fact that the 800 K temperature variation has the highest value of both flame’s temperature and laminar flame speed for the same value in equivalence ratio compared to all of the variations. However, a higher ring’s temperature value resulting in a lower or reduced flame’s height formed for the same equivalence ratio. Also proven by the fact that the 800 K temperature variation also has the lowest flame’s height value compared to all the variations at any given equivalence ratios.
Oxy-combustion merupakan salah satu teknologi yang dikembangkan untuk mengurangi jumlah CO2 yang dilepas ke atmosfer dalam rangka mengurangi efek rumah kaca dan pemanasan global. Resirkulasi gas hasil pembakaran pada oxy-combustion mengakibatkan adanya CO2 dalam proses pembakaran. Kajian ini dilakukan untuk mengetahui pengaruh persentase CO2 terhadap kecepatan api premixed laminar pada proses pembakaran oxy-butane. Pengujian dilakukan pada rasio ekuivalen sebesar 0,6, 0,8, 1, 1,2 dan 1,4. Kadar CO2 divariasikan sebesar 50%, 55%, 60%, 65% dan 70%, dihitung berdasarkan jumlah oksigen dalam proses pembakaran. Pengukuran kecepatan api premixed laminar dilakukan pada cylindrical tube burner. Hasil kajian menunjukkan bahwa suhu nyala api dan kecepatan api premixed laminar berkurang dengan bertambahnya persentase CO2 dalam oksidator. Adanya CO2 mengakibatkan kalor yang dihasilkan dari proses pembakaran sebagian diserap untuk meningkatkan suhu CO2, sehingga suhu nyala api berkurang. Adanya CO2 dalam reaktan menghalangi bertemu dan bereaksinya butana dan oksigen, sehingga kecepatan pembakaran menjadi lebih lambat. Penurunan suhu pembakaran juga merupakan salah satu penyebab penting terjadinya penurunan kecepatan pembakaran pada campuran dengan kandungan CO2. Selain itu, diketahui bahwa untuk setiap persentase CO2 dalam oksidator, nyala api memiliki suhu dan kecepatan pembakaran maksimum pada rasio ekuivalen sama dengan satu.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.