This study determines the effect of the Work-Based Learning (WBL) model on achievement motivation of students in the Study Program of Mechanical Engineering at Vocational High Schools (VHS) compared to the Training Within Industry (TWI) model. This study used a quasi-experimental research method with a factorial design in two groups of XII grade vocational high school students of mechanical engineering. The data in the form of achievement motivation was collected using a questionnaire. The data were analyzed using two way Anova technique with α of 0.05. The results showed that (1) the students taught using the WBL model had a significantly higher achievement motivation than the achievement motivation of students taught using the TWI model; (2) students with high prior knowledge had a significantly higher achievement motivation than the achievement motivation possessed by students with moderate and low prior knowledge; and (3) there is an interaction between the use of learning models and students' prior knowledge towards students' achievement motivation. The findings indicated that the WBL model has the potential to improve the quality of learning outcomes of vocational education, especially in increasing students' achievement motivation, compared to traditional learning using the TWI model.

Distorsi las T baja ST37 dengan SMAW berpengaruh pada kualitas, ketelitian, ukuran, dan dimensi. Distorsi dipengaruhi oleh panas lasa dan tebal pelat. Penelitian bertujuan menganalisis variasi arus listrik (I) dan tebal pelat (h) terhadap distorsi angular T Baja ST 37. Metode yang digunakan berupa kajian eksperimental pre test dan post test untuk memperoleh data yang relevan dengan hipotesis yang akan diuji. Tujuan penelitian (1) Menemukan pengaruh variasi besar arus listrik (80 A, 100 A, dan 120 A) pada pengelasan SMAW terhadap distorsi angular sambungan T baja St 37, (2) Menemukan pengaruh variasi ketebalan pelat (3 mm, 4 mm, dan 5 mm) pada pengelasan SMAW terhadap distorsi angular sambungan T baja St 37, (3) Menemukan pengaruh yang signifikan antara variasi arus listrik (80 A, 100 A, 120 A) dan ketebalan pelat (3 mm, 4 mm, 5 mm). Penelitian ini tergolong jenis penelitian eksperimental dengan rancangan factorial 2 x 3 x 3. Hasil penelitian menemukan bahwa besar arus listrik dan ketebalan pelat mempengaruhi terjadinya distorsi angular pada sambungan T baja St 37, diantaranya: (1) Arus listrik 120 A menghasilkan mean distorsi angular tertinggi yaitu 2,014 mm dan arus listrik 80 A menghasilkan mean distorsi angular terendah yaitu 0,558 mm, (2) Ketebalan pelat 3 mm menghasilkan mean distorsi angular tertinggi 2,014 mm dan ketebalan pelat 5 mm menghasilkan mean distorsi angular terendah 0,558 mm, (3) Pada arus listrik 120 A dengan ketebalan pelat 3 mm, pada pengelasan sambungan T paling tinggi menyebabkan distorsi angular daripada arus listrik dan ketebalan Pelat yang lain dengan nilai rerata sebesar 2,014 mm.

The quality of skills and work attitude of vocational graduates is still in the eyes of the industry. Therefore, SMK is required to develop new environments and or innovative and interactive learning models that directly educate students to work by the 2013 Curriculum that focuses more on developing attitudes.

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Thin Wall Ductile Iron (TWDI) is used in exhaust manifolds in the automotive industry. TWDI can also be called thin, ductile and strong steel. However, from some of the improvements, further observations are still being made. One of the ways to investigate TWDI is in the form of multi-stage spheroidising heat treatment. He treated this for an in-depth study of preventing the formation of carbides and knowing the structure of TWDI. Temperature and time are the main parameters given to the heat treatment, which is a temperature of 700 0C and held for 30 hours. This is to explore the structure of the surface on. Various empirical evidence shows that it is very important for further observation and development in the improvement of TWDI. Keywords: Investigation, Thin Wall Ductile Iron, Spheroidising