Page 10 - MFi Vol.152 ATZ Extra Issue 2019
P. 10

                                Aluminum alloys used in automobiles : 4
               04               Aluminum alloy joining technologies

                                   Enhanced aluminum presence in the current multi-material trend

           Today, as in the past, fusion welding is the mainstream method   called Mechanical Clinching, which enables tight fixing without
           for joining aluminum alloys. The two most common kinds of   rivets.
           welding are Metal Inert Gas (MIG) and Tungsten Inert Gas (TIG).   Behind the rise in the number of body structures, there has also
           Aluminum alloys were introduced to reduce vehicle weight, and   been an increase in the use of structural adhesives.
           this led to breakthroughs in the aluminum joining technologies   Moreover, joining technology for combining different materials,
           used in the manufacture of cars, including laser welding and   such as aluminum and steel or aluminum and resin, continues to
           Friction Stir Welding (FSW), for joining without a melting   evolve. It can be described as a trendy technology that is
           process. These technologies are both being used widely today.  capable of contributing not only to the increased utilization of
           In the case of Mechanical Joining, the technology for fixing   aluminum alloys, but also to reducing the weight of the vehicle
           parts together with rivets, bolts and screws, self-piercing rivets   body and the chassis structure.
           and other devices has evolved. There is also the technology

                 Evolving joining technologies for aluminum

                                                            Laser beam welding
     Motor Fan illustrated
                                         Resistance spot welding  (aluminum/aluminum)  Adhesion
                      Resistance spot welding   (aluminum/aluminum)

                                                                                              MIG welding
                 Flow drill screws



                                                                                             Semi-hollow punch rivets

            Friction Element Welding

                                                                                              YAG laser welding

                        MAG welding
                         (steel/steel)         Roller hemming      Clinching        Punch rivets

                                        FSW FSSW
                                                                  Friction stir spot welding (FSSW)
                                      Friction stir welding (FSW) is a joining
                                      technology that involves the use of a
                                      tool with a pointed revolving tip that is                Tool
                                      pressed against the metal, which is
                                      then softened by friction-generated
                                      heat. This plasticized material is used
                                      to join pieces of metal together.
                                                                                    Insertion/joining  Withdrawal
   5   6   7   8   9   10   11   12   13   14   15