Ultrasonic metal welding (USMW) is a formidable technique for producing joints of stranded wires and terminals, especially for dissimilar metals, e.g. aluminum wires and copper terminals. As the welding occurs at semi-solid state below the melting temperatures of both metals, the formation of brittle intermetallic compounds of aluminum and copper can be greatly reduced. Due to this, USMW sees widespread use in wire processing and is utilized mostly by suppliers of automotive, ship and aerospace OEM. Compliance with quality guidelines poses a central factor for the success of this technology in batch production. This paper focuses on methods for non-destructively evaluating joints directly after the welding procedure by means of oscillation measurements via vibrometry, thermal measurements as well as analysis of recorded machine data. The measurements have been correlated with tensile testing via Pearson correlation. It has been found that oscillation measurements via vibrometry are able to detect surface contamination due to the reduction of the oscillation amplitude of the terminal during the compaction phase. Thermal measurements via thermocouples showed a strong correlation with the tensile forces. However, their dependency on manual and reproducible placement renders them unsuitable for usage in batch production. The criterion “horn penetration velocity”, derived from the horn compression displacement and weld time, has been identified as a rapid to determine, yet reliable factor for tensile force prediction directly after the welding procedure, though.