Developing a Control System and Efficiency Evaluation on Hydroxyl Gas Production for Welding

Abstract

              The aims of this research were to 1) develop the voltage and current control system of hydroxyl gas production for welding, 2) evaluate the constructed system's efficiency, and 3) examine students' acceptance using the technological acceptance model. The sample group comprised the fourth-year students of Arts Industry, Nakhon Pathom Rajabhat University. The research instruments used in the research were a system for producing hydroxyl gas for welding, a questionnaire for efficiency of experts, and a technology acceptability questionnaire. Mean and standard deviation were utilized in the analysis.

            The results showed that 1) the developed system was divided into two components: the section control and direct the voltage and current control system used to generate hydroxyl gas, and a gas welding unit that worked by electrolysis in an electrolyte cell. The primary equipment was current and voltage sensors, a microcontroller board, a gas welding machine power supply unit, and an alarm unit, 2) the system of performance tests was indicated at 25 volts, 1 liter of water to 1:10 g. of baking soda which can be produced a gas volume between 100 and 500 ml. The average time required for gas production was at 5.71 - 39.30 minutes. The solder terminals and copper wires at 35 square millimeters were used, an average soldering time of 26.29 seconds and an average soldering temperature of 220.The measurement was at 12 °C. Welding and soldering produced highly durable work pieces, and 3) the students' acceptance were rated at the highest level ( = 4.53, S.D. = 0.53).