Friction Stir Welding Manufacturing companies dealing with high stress and pressure [aerospace], typically avoid welds, because of the weakness it creates in the metal and its limitations. But mastering friction stir welding could result to a much stronger bonds than traditional welds. As you can join large, thin sheets of metal [ex. Light-weight alloys], and shave off pounds of weight by avoiding the use of rivets, fasteners, and other support structures. Making the manufactured device /machine, lighter and stronger.