In the production process and use of the welding industry in similar and dissimilar metals, there is a possibility of cracking and failure phenomena occurring under different stresses and loads at certain points, which can be weak points in the connection of welded structures. This leads to a decrease in safety and efficiency in the structure over time, and also creates a risk to the health of the structure and serious and irreparable accidents from it. Therefore, it is very important to investigate the failure mechanisms, including fracture and cracking and their growth in welded joints, which is one of the methods to be used for non-destructive testing of acoustic emission. In this study, ultrasonic welding was used to weld two dissimilar metals, 3105 and 1050 aluminum, with thicknesses of 0.5 and 1 mm, between samples manufactured according to ASTM E8M standards using ultrasonic welding at a frequency of 20 kHz and variable energy parameters of 150, 100, 200, and 250 joules. the parameters of the welding machine such as energy, horn holding time, converter power and applied pressure at the welding point were investigated to achieve the best strength. The tensile strength, strain energy and permeability of the elements at the joint surface of the samples were determined by the tensile machine and acoustic emission data such as energy, amplitude, count and time were recorded by the sensors of the acoustic emission machine during the tensile process. The maximum force tolerance was (1530) N , corresponding to a sample with a welding energy of (250) Joules, a power of (2980) Watts, and a time of (0.1) seconds. The minimum force tolerance was (950) N , corresponding to a sample with a welding energy of (100) Joules, a power of (1500) Watts, and a time of (0.075) seconds. The strain energy capacity of the four welded samples was 517, 970, 1696, and 2482 in joules, respectively, with the highest strain energy value for the sample welded with 250 joules of energy.