Since the invention of friction stir welding (further abbreviated as FSW) 18 years ago, it wasobvious that this technique had some significant advantages regarding automotive andaviation industries. However, a breakthrough is never achieved so far. This is partiallybecause FSW has to compete with some very common an reliable techniques like arc andspot welding. Also Saab uses spot welding very often. In general, a regular car containsbetween 2000...