The technology in modern era and rapid construction sector has made welding an important role in the field of metal engineering and repair. Therefore, the technology in the construction sector, especially in the engineering sector, requires a welding element. Welding is used to combine with metal. Making this connection requires high skill for welder in order to obtain a good quality connection. The aim of this study was to determine the quality of a good welding result using the design of experiment method by looking at the control factor of the electrode, welding amperage, welding method, plate thickness, and welding speed. In addition to control factors, there are also use noise factors such as skill, cleanliness of work pieces, and distance between work pieces. The results of the experiments are based on weld defect criteria and the DOE method with ANOVA calculations, the best welding results are in trial no 7 with an average value of 0.22. Meanwhile, the results of the experiment with welding defects is trial experiment no 2 with a value of 0.64. The factors that influence the quality of the welds are plate thickness, welding amperage, electrodes, and welding method. Meanwhile, the welding speed factor is a factor that does not significantly affect the weld quality.

The process of spreading covid-19 is very fast and we must always be vigilant about this one outbreak. When the disease is transmitted so quickly by hand or direct contact. When crowding out we don't know where the disease came from or from who, so we have to keep our distance, wash our hands, wear a mask. Until now, the spread of the virus has increased more than in the previous year and the number of positives every day continues to increase, while various activities must continue to run so that people can remain productive and feel safe. Therefore, the purpose of implementing the re-design of the existing sink was made to re-create a portable pedal sink that was designed in the Autodesk Inventor application and updated on the cover of all sides of the sink so that it is tidier. The manufacturing process is more flexible and there are two sinks, right and left. For the sink work system, the system is stepped on so it is safer for us to use because it is without using hands. If you look at the public in general, they still use an ordinary sink so that the Mechanical Engineering Students of the Muhammadiyah University of East Kalimantan can design and design a pedal system sink or stepping system to make it easier for the prevention of Covid-19 in the city of Samarinda.

Welding is an activity of joining two or more metals by heating them until they melt, in which the melted or melted workpieces will unite with the help of additional materials to form a connection or a whole piece of metal. The purpose of this study was to determine the effect of welding current, type of electrode and pattern of electrode movement on the strength of the welds against the impact test in order to produce optimal welding strength. The method used in this study is the Taguchi Method. This study used a SMAW welding machine with a 1G welding position. The material used in this research is AISI 1045 steel. The experimental design uses L4 (23) which has been designed by Orthoghonal Array. Next, the welding process and impact test are carried out. The results of the Impact Test were then analyzed using ANOVA. The results of this study are that the highest percentage yield value for the strength of the weld results is found in the type of electrode with a percentage of 21% and the lowest percentage value for the strength of the weld results is in the movement pattern of the electrode with a percentage of 10%.