"Aluminium conductors offer significant weight and cost advantages over copper, but they present real joining challenges: a tenacious oxide layer, sensitivity to soldering, and a tendency toward galvanic corrosion when paired with dissimilar metals. Ultrasonic aluminum wire welding machines solve these challenges by fusing aluminium strands together, or to a terminal, without heat, so... https://sttellardawang.com/blogs/choosing-best-ultrasonic-aluminum-wire-welding-machine