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