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Arc welding is a widely used joining process that employs an electric arc to melt and fuse metals together. It requires a power supply that creates sufficient heat to soften the base metals and filler material. The process can be performed using either alternating current (AC) or direct current (DC), depending on the application. Arc welding is versatile and is applied in construction, automotive, aerospace, and manufacturing industries. Safety precautions such as helmets, gloves, and protective clothing are essential due to sparks, UV radiation, and heat. Its strength, cost-effectiveness, and adaptability make arc welding one of the most common welding techniques.