Analisa Kekerasan Dan Struktur Mikro Pada Baja Aisi 1018 Akibat Proses Pack Carburizing Dengan Variasi Konsentrasi Serbuk Cangkang Keong Emas

This  research to investigate the effect of Pomacea Canalikulata Lamarck powder addition in the process of carburization box to physical (microstructure) and mechanical properties (hardness test) of AISI 1018 after heat treatment. In this research used a material of low carbon steel cylinder (AISI 1018). The process of making the specimen is done with to cut into several pieces, cutting done to ease in placing the specimen in the carburizing box, then wood charcoal powder and shell powder were weighed in accordance with the desired composition by mixing powder of 5 wt%, 10 wt%, and 15 wt%. The specimen was done heat treatment at a temperature of 9500C with the holding time at 2, 4 and 6 hours. Then, the specimen was done the Vickers hardness test, microstructure and composition  test. From this research it can be concluded that the highest hardness value was obtained at 15 wt% addition of shell powder it was 262.26 kg/mm2 and the initial material hardness value was 144.08 kg/mm2. From microstructure observation and composition test show that it subjected surface hardening because carbon diffusion into specimen

Pengaruh Orientasi Dan Fraksi Volume Serat Daun Nanas (Ananas Comosus) Terhadap Kekuatan Tarik Komposit Polyester Tak Jenuh (Up)

Composite manufacturing is done by hand lay-up method with a fiber volume fraction 10%, 20%,30%, and 40% with unidirectional and random short fiber orientation of pineapple leaves. Specimentesting is performed with a standard tensile strength test ASTM D3039. As a results is known that thetensile strength of composites increased with increasing fiber volume fraction for unidirectional fiberorientation, but rather to the random orientation of short fibers. Meanwhile, the composite tensile strainincreases with increasing fiber volume fraction for both the orientation of the fibers of pineapple leaves

Efforts to Improve K3 Culture (Occupational Safety and Health) in Harmonika Door Welding Workshop Smes

Counseling and socialization of the use of Personal Protective Equipment (PPE) is one of the efforts to support Occupational Health and Safety. Welding workshop "Jaya Mandiri" is an activity partner that requires this. The purpose of the activity is to increase awareness and skills on the importance of using PPE when working. For this reason, making SOPs for the use of PPE is a mandatory procedure to start a job. The method used is counseling and demonstration of the use of PPE then followed by the use of PPE while working. The results of the activities were analyzed using a Likert scale. After that, the SOP and supervision methods were determined by the workshop owner in the use of PPE so that it became a habit to become a culture. The results obtained after counseling and demonstration of PPE are an increase in understanding and skills in the use of PPE from employees. From the results of the Likert scale analysis, the highest was the use of welding safety helmets after counseling 74.29% from the previous average of 31.43%. The lowest result is the use of apron (Apron) 57.14% before 22.86%. It was also found that one of the employees who had the highest understanding and skills in the use of all PPE, namely Munahar, reached 84% after counseling from only 40% previously. The skills and discipline of employees in the use of PPE still need to be improved by means of supervision by SME owners. The service implementation team together with the workshop owners and employees agreed to make an SOP in supervising the use of PPE to support K3 so that it becomes a good and entrenched habit