Ultrasonic welding machine for electrical and electronic flexible connections with copper bars and wires welds copper or aluminum foil sheets or fine wires onto thick plates. It is commonly used for welding positive and negative electrode tabs of lithium-ion batteries, or for large-area and thick metal applications such as copper and aluminum plates, wire harness terminals, and automotive wiring harnesses. It is increasingly valued in fields such as new energy vehicle power batteries, new energy photovoltaic and wind power generation, rail transportation, electrical equipment, electronic devices, communication equipment, automotive manufacturing, and aerospace.