Ultrasonic welding has emerged as a promising technique for joining thermoplastic materials due to its efficiency and precision. In this study, we explore the application of ultrasonic welding for joining two parts of a laptop charger case made of Acrylonitrile Butadiene Styrene (ABS) material. Weld trials were conducted with systematic variations in input energy, weld time, and hold time to investigate their effects on weld quality. Subsequently, the produced welds were subjected to comprehensive testing and characterization to evaluate their quality and to establish the dependency of weld characteristics on the process parameters. The characterization techniques employed include X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Through this experimental work, insights into the impact of process parameters for ultrasonic welding of ABS laptop charger cases are provided, enhancing understanding of the process and enabling improvements in welding efficiency and quality ultrasonic.