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ANALISIS KUALITAS REPAIR WELDING METODE MIG DENGAN PELAKUAN PREHEATING DAN VARIASI ARUS PENGELASAN PADA CAST WHEEL ALUMINIUM Eko Budi Susilo; Budi Harjanto; Suharno Suharno
Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 2 (2020)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v2i1.43232

The aim of this study are: (1) to identify the chemical composition of the aluminum cast wheel; (2) to identify the shape of the microstructure in the MIG welding method with preheating treatment and variation of the welding current; (3) to obtain the level of violence before and after welding the MIG method with preheating treatment and welding current variations; (4) to obtain the level of impact toughness before and after welding the MIG method with preheating treatment and welding current variations. The study was conducted by taking specimens from the cast wheel in accordance with the research standards used, then welding the MIG method using the ER4043 electrode with preheating treatment and current variations of 90 A, 100 A, and 110 A. The data analysis technique in this study used descriptive data analysis. Analyzing data includes testing the chemical composition, microstructure, price of hardness, impact toughness. Based on the results of the study it can be concluded that: (1) The chemical composition of the cast wheel is Aluminum (Al) 91.74%, Silicon (Si) 7.62% This cast wheel is a type of aluminum series AA4343; (2) The microstructure of the aluminum cast wheel shows that variations in the welding current will affect the size of the aluminum and silicon grains; (3) The hardness value in raw material specimens is 96 HV while the highest hardness value in the welding area is at 100 A welding current which is 60.2 HV, while the lowest hardness value is at 90 A welding current which is 52.0 HV; (4) The value of impact toughness on raw material specimens is 0.45 J / mm2. The lowest impact toughness value with 100 Amperes current is 0.46 J / mm2 and the highest impact toughness value with 110 Amperes current is 0.52 J / mm2.

EVALUASI PELAKSANAAN PEMBELAJARAN PEMELIHARAAN MESIN SEPEDA MOTOR KELAS XI DENGAN MODEL CIPP (CONTEXT, INPUT, PROCESS, PRODUCT) DI SMK NEGERI NGARGOYOSO Nina Intan Saputri; Ranto Ranto; Suharno Suharno
Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 2 (2020)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v2i1.43236

The purpose of this research is to evaluate the implementation of motorcycle engine maintenance learning at Ngargoyoso Vocational High School. The evaluation in this study uses the CIPP model (context, input, process, product). The location of this research is in Ngargoyoso Vocational High School on learning to maintain class XI motorcycle engines with research subjects as teachers of maintenance for motorbike engines in class XI, students of class XI, and facilities. The technique of collecting data used a questionnaire that was distributed to class XI TSM A, XI TSM B, and XI TSM C and the teacher of motorcycle engine maintenance. Interview with one of the teachers, and document the final value of maintaining a XI class motorcycle engine. The validity used in this study is content validity where validation is carried out by experts. The trial of the research instrument was conducted in class XI of TSM D Ngargoyoso State Vocational School by testing the validity of using SPSS. Analysis of scores using the average to be assessed based on the assessment criteria. The results of the study show: (1) evaluation of the context (context) which includes the background of the program has been classified as good; (2) evaluation of input (input) is classified as good, input aspects include: human resources, curriculum, learning resources, and infrastructure; (3) evaluation of the process (process) which includes the process of implementing learning in classrooms and workshops is classified as good, but the aspects of the learning media used are quite sufficient so that they need to be improved. (4) Evaluation of product (product), which is the final grade of students classified as good.

PENGARUH MEDIA PENDINGIN PADA PENGELASAN BAJA S45C MENGGUNAKAN METODE PENGELASAN GAS METAL ARC WELDING TERHADAP KEKERASAN DAN STRUKTUR MIKRO Rachmadani Rachmadani; Suharno Suharno; Herman Saputro
Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 1 (2020)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v2i1.43237

This study aims to determine the effect of cooling media on microstructure and hardness values on alloy steel S45C using the welding method of Gas metal arc welding (GMAW). This research is using an experimental method. The data analysis technique used is descriptive comparative. The tool used for microstructure testing is Olympus Metallurgical Microscope and hardness test using the Vickers Hardness Tester. Based on the results of the study, it can be concluded that the results of the microstructure show an increase in the structure of pearlite after welding. In raw material, ferrite structures are seen evenly but in the welding results, GMAW which has cooled by using water, air, and oil cooling media show that ferrite is reduced in each specimen, so the pearlite structure dominates. The values of hardness and microstructure in the welding results using water, oil and aircooling media show differences in the level of hardness and microstructure. Specimens with water cooling media at the Heat Affected Zone (HAZ) test point have a higher hardness level of 315.4 VHN when compared to specimens using an oil cooling medium of 268.7 VHN and air conditioning media of 177.4 VHN. Specimens with water cooling media the microstructure in the Heat Affected Zone (HAZ) section showed more pearlite which was evenly distributed compared to specimens using other cooling media, or it could be concluded that the further away from the Las area and HAZ the smaller the pearlite content. This study shows that welding using variations in cooling media changes the microstructure and influences the hardness value of the S45C steel alloy

IMPLEMENTASI PROGRAM SEKOLAH LIMA HARI (PS5H) DI SMK TERHADAP KESIAPAN KERJA SISWA Eko Saputro; Suharno Suharno; Budi Harjanto
Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 2 (2020)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v2i1.43233

The objectives of this research are 1) to know the correlation between the implementation of intracuricular activities in the five-days school program at Vocational High Schools toward students’ work readiness, 2) to know the correlation between the implementation of co-curricular activities in five-days school program at Vocational High School toward students’ work readiness, 3) to know the correlation between implementation of both activities (intracuricular and co-curricular) or five-days school program in Vocational High School toward students’ work readiness. This research was conducted in Vocational High School State 5 Surakarta. This research used a quantitative approach with a descriptive correlational research design because it is aimed to see the level of correlation between independent and dependent variables. Data collection techniques used in this research is questionnaire. Data testing techniques using simple correlation analysis techniques and multiple correlation using the SPSS application program version 25.0. Based on thefinding of the research , it can be concluded that 1) there is a positive correlation and a significant correlation between the implementation of intracuricular activities in five-days school program toward students’ work readiness as proved by the value of rcount = 0.422 > rtable = 0.174 and the significance value of 0.00 < 0.05, 2) based on that there is a positive correlation and a significant correlation between the implementation of co-curricular activities in five-days school program toward students’ work readiness as proved by value of rcount = 0.622 > rtable = 0.174 and the significance value is 0.00 < 0.05, 3) there is a positive correlation and a significant correlation between both activities ;intracuricular and co-curricular or the five-days school program in Vocational High School toward the students’ work readiness as proved by the value of Fcount = 40.123 > Ftable = 3.07 and the significance value of 0.00 < 0.05. The finding of this research can be selected as a consideration and suggestions for the government in determining and deciding the policy.

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