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Jurnal Nosel
Published by Universitas Sebelas Maret
ISSN : -     EISSN : -     DOI : -
Core Subject : Education, Engineering,
Education Mechanical Engineering
Arjuna Subject : -
Articles 14 Documents
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Search results for , issue "Vol 2, No 4 (2014): April" : 14 Documents clear
FAKTOR-FAKTOR KENDALA STUDI MAHASISWA PENDIDIKAN TEKNIK MESIN ANGKATAN 2009 UNIVERSITAS SEBELAS MARET Apriati, Fitri
Jurnal Nosel Vol 2, No 4 (2014): April
Publisher : Jurnal Nosel

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Abstract

The research aims at knowing and identifying the factors of learning constraint from the students of mechanical engineering education in the year of 2009, Sebelas Maret University. This research was qualitative research. The method used in this research was descriptive. Total populations in this research were all students of PTM class of 2009, with the total students are fifty-six students. Samples were taken by total sample technique. The data collection techniques were questionnaires and interviews. The data validation was using data triangulation and triangulation methods. The data analysis technique in this research was using descriptive analysis. Results of this study show that: (1) Physical factors especially  healthly are categorized of learning constraint from the students of PTM class of 2009. This is showed through the sub-indicators of break-time pattern and diet pattern. Break-time pattern is in medium category with a percentage of 42.86%. Diet pattern is medium category. And its percentage is 41.07%. (2) Psychological factors aren?t categorized of learning constraint from the students of PTM class of 2009. This is showed by the interest indicator, motivation, talent and intelligence. The interest indicator is in the low category with a percentage of 53.57%. Motivation is in the low category with a percentage of 67.86%. Talent is in the low category with a percentage of 55.36%, while intelligence is low category. And its percentage is 75.00%. (3) Family factors are categorized of learning constraint from the students of PTM class of 2009. This is showed through atmosphere of the residence. Atmosphere of the residence is in medium category with a percentage of 48.21%. (4) Academic factors are categorized of learning constraint from the students of PTM class of 2009.This is showed by the indicator method of teaching and the learning facilities. Method of teaching is in the medium category with a percentage of 48.21%. The learning facilities in a category medium, and the percentage is 58.93%. (5) Non-academic factors are categorized of learning constraint from the students of PTM class of 2009. This is showed through the indicator of a friend in a medium category with the percentage of 50.00%.
KAJI BANDING KUALITAS REPAIRWELDING DENGAN METODE PENGELASAN OKSI ASETILIN, TIG, DAN MIG DENGAN PERLAKUAN PWHT PADA CASTWHEEL ALUMINIUM Nur Wikani, Dita Febriana
Jurnal Nosel Vol 2, No 4 (2014): April
Publisher : Jurnal Nosel

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Abstract

Repair welding is a method to repair the fractures in cast wheel aluminium. The repair welding process will produce residual stress which decrease mechanical characteristics such as strength, hardness, etc. PWHT is a heat treatment which is conducted after welding processwith purpose to decrease the residual stress.The purposes of this study were to determine the comparison of chemical composition, microstructure, hardness value, and impact toughness of cast wheel aluminium on the result of repair welding with Oxy Acetylene, TIG and MIGwelding method with PWHT treatment and raw material specimen. Welding that conducted were Oxy Acetylene, TIG and MIG then followed by PWHT treatment. Test were performed on the study were chemical composition test, microstructure, hardness and toughness. The data obtained from the study were processed using descriptive analysis technique. The result of test showed that the cast wheel aluminium used in this study is aluminium alloy AA4643 series. The percentage of Si elements affect the microstructure of the specimen where the higher the percentage of Si element increasingly clear distinction between the grains of aluminium with Si. The highest average hardness value is in raw material specimen of 42,693 BHN. On specimen which experience welding with PWHT treatment the highest average hardness value in specimen that had Oxy Acetylene welding of 34,624 BHN in the weld area and 31,818 BHN in the HAZ area. The lowest hardness value contained in the TIG specimen at 28,384 BHN on the welding area and in the HAZ area contained in the specimen which experience MIG welding process with average hardness value of 23,677 BHN. The average highest toughness number contained in TIG specimen with 0,12776 joule/mm2, while the lowest toughness number contained in MIG specimen with 0,072 J/mm2.
PENGARUH FRAKSI VOLUME SERAT GELASTERHADAP KETAHANAN BAKAR KOMPOSITDENGAN MATRIKS RIPOXY R-802 EX Hanif, Wakhid Nurrohman
Jurnal Nosel Vol 2, No 4 (2014): April
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Abstract

            The objectives of this research are to investigate: (1) the effect of volume fraction variations on the fire resistance of the glass fiber composite with the matrix of Ripoxy R-802 EX; and (2) glass fiber volume fraction with the highest fire resistance ofthe glass fiber composite with the matrix of Ripoxy R-802 EX. This research used the experimental research method. It was conducted at the Engineering Material Laboratory, the Department of Mechanical Engineering, the Faculty of Engineering, SebelasMaret University, Surakarta. The instrument used to investigate the fire resistance of the composites was fire resistance testing device of ASTM D-635. The specimenof the research was glass fiber composite with the matrix of Ripoxy R-802 EX with the glass fiber fraction compositions of 15%, 25%, 35%, and 45% respectively. The fire resistance testing of the composite was done according to the standard of ASTM D-635. The indicators of the fire resistance were determined based on the time of burning (TOB) and the rate of burning (ROB). The data of the research were analyzed by using the comparative descriptive technique of analysis.The results of the research are as follows. 1) The more the content of the glass fiber content was, the time of burning was increasing but the rate of burning was decreasing. This indicates that the larger the glass fiber content is, the fire resistance of the composites is increasing, that is, increasing the value of the TOB but decreasing that of the ROB. 2) In accordance with the standard of ASTM D-635 for the fire resistance testing with the method of the horizontal burning test, the use of the glass fiber with the content of 45% in the composite made this composite possess the highest burning resistance.
STUDI KUALITAS WELDING REPAIR DENGAN METODE PENGELASAN TIG DENGAN PERLAKUAN PWHT PADA CAST WHEEL ALUMINIUM Munfiroh, Alfin
Jurnal Nosel Vol 2, No 4 (2014): April
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Abstract

This research aims to know i.e.(1) Determine the effect of the composition and microstructure of the weld area with a result of repair welding using TIG welding method with PWHT treatment on the aluminium cast wheel. (2)Determine the value of hardness and impact strength on the results of the repair welding using method of TIG welding with PWHT treatment on the aluminium cast wheel.     This research applied descriptive quantitative method with the source of data that consists of the results of the composition test, micro structure, impact test and test of Brinnel aluminium cast wheel.The data analysis technique used in this research was descriptive technique. This study observed the results of experiment directly then analyzed it and then the experimental results concluded. Result of this research shows that chemical composition of aluminium cast wheel changed after TIG welding process with PWHT treatment done. Al content of the original elements have increased 94.93% to 97.60% after the TIG welding process with PWHT treatment done as well as the elements of Si, namely changes in raw materials has decreased by 4.61% to 1.21%. The highest hardness value in raw material that are 42.69 BHN while in the weld part decreased to 28.28 BHN, the lowest hardness value in base material are 21,39 BHN. The highest value of impact strength are 0,14 joule/mm2on the weld part while on the raw material, the lowest value are  0.09 joule/mm2. The conclusion that was obtained from this study was PWHT process decreased hardness value. The hardness value of TIG specimen was lower than raw material specimens hardness number.

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