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This study aims to determine the effect of induction heating on tensile test specimens' clamping products through the medium carbon steel materials' engineering technique from heating using induction heating to heat the medium carbon steel. The research method used observation, interviews, literature study, design of sample materials, experiments, and sampling of experimental data carried out on 30x60x5 mm medium carbon steel specimens using induction heating media, with variations in holding time of 30 and 60 seconds, and temperatures of 800 and 850 °C then proceed with the cooling process with water and oil. The test results were analyzed using the method of analysis of variance based on the experimental design type two factorial levels with a two-factor interaction design model and two responses. The analysis results showed that the combined value of the induction heating effect factor of each test response to the test specimen, that is, water media quenching; holding time; 19.298%, temperature; 29.824%, and the interaction of holding time with temperature; 1.754%. Oil media quenching; holding time; 14.893%, temperature; 30.851%, and the interaction of holding time with temperature; 7.446%.

Nodular Cast Iron have ductile properties when added with elements of magnesium or cerium and this will cause the ductility range of 10-20% increase, hardness and low tensile strength, easy to be formed compared to alloy steel (alloy steel) or high carbon steel (high carbon steel) and the price is relatively cheap, making this material widely used as a basic material (raw material) for the manufacture of a product. To get hard properties on the surface, this material can be carried out a surface hardness process, so that the product can be functioned according to its application. Way that can be done to increase surface hardness as well as low carbon steel strength is by adding carbon elements to the steel which is commonly known as carburizing. The carburizing process is carried out on a muffle furnace specifically heat treatment that is easy to operate in setting the heating temperature, heating speed and holding time. In this research, it is designed and carried out on low carbon steel using carburization media with a ratio of 70% activated carbon and 30%, calcium carbonate (CaCO3) at 900°C heating temperature, holding time variations of 2, 3 and 4 hours respectively, then proceed with the process cooling or double quenching. The results of this study are expected to obtain a product made with cast iron nodular material, so it can the economic value of the product.

Technology has been integrated into daily uses electrical energy as the main energy source. In the utilization of electrical energy, there is a very detrimental waste such as turning on electronic equipment but not being used. In addition to the factor of human negligence, the unmonitored electrical energy used causes ignorance of the wasting of electrical energy. Therefore, this study build a system that can monitor and control the use of electricity based on the Internet of Things with NodeMCU and PZEM-004T devices. NodeMCU equipped with the ESP8266 wi-fi module can transmit data from the PZEM-004T sensor readings via the internet network as the result. The PZEM-004T sensor can read the value of AC voltage (V), AC current (A), Active power (W), power factor (Cos Phi) and used electrical energy (kWh) and frequency.