Preparation of orthodontic arch wire by laser welding of Ti/TiNi dissimilar alloys

TiNi shape memory alloy has good biocompatibility and superelasticity on the basis of certain strength and stiffness. In
the process of tooth correction, stainless steel of  composite orthodontic arch wire is used as the support of supporting
teeth. TiNi alloy of  composite orthodontic arch wire is used to  correct the dislocation teeth. Compared with the traditional
stainless steel arch wire, composite orthodontic arch wire can reduce the pain of patients.  In this experiment, laser welding
was carried out by filling Cu filler metal. Laser centering welding and laser offsetting welding were used respectively, and
the joint strength was compared. It was found that laser offsetting welding can effectively reduce the content of interface
intermetallic compounds and improve the joint strength.