A method for bonding a first member made of a niobium titanium alloy to a second member

The method includes: the corresponding surface of each of the first member and the second member is pressed together to form an interface between them; Provide molten active solder at least on the surface of the first member at the interface, and make the molten active solder thermal activation; Mechanically agitate the molten active solder so that the molten solder adheres to the first member and the second member, and forms a continuum of the molten solder connecting the first member and the second member; And solidifying the continuum to form a solder joint between the first member and the second member.

We have found that solder joints produced in this way have higher reliability than previous solder joints and pressure joints. This is because we found that the tensile strength of the solder joint generated between the first member and the second member is three to five times greater than that of the known solder and pressure joints, both at room temperature and at temperatures of about 77K.In addition, since the active solder does not require flux, the solder joint can be produced in the unaided flux process. This means that the process of using rely on flux and compared to the production of solder joints, the solder joints failure rate is lower and because depend on the flux of the process of flux residues aggressive chemical properties, because flux residues may not be easy to wash and corrosion of solder joints and adjacent area. Examples of failure to wash flux off are in blind joints where all or part of the joint cannot be seen. Corrosion is particularly common when joints are exposed to moisture. However, niobium-titanium alloys cannot be wetting even with invasive flux.

In addition, the physical dimensions of the first and second members are not affected by the welding process, but are affected by the implementation of the crimping process. This leaves the electrical and radio frequency characteristics unchanged. In addition, solder joints have been found to have an improved response to thermal cycling and thermal mismatches between components, thereby reducing the failure rate of such solder joints.

In addition, by using solders, the temperature used in the process is lower than that used in, for example, welding or brazing. This limits the potential for damage to other components in thermal contact with the first and second components or in contact with the solder itself. "This means that the joints is destroyed by depends on the chemical reaction exists in each of the first and second member of any of the oxide on the surface and is dependent on the van der Waals force to form joint, made, rather than making one or two components (partially) melt to form joint, like welding case, but not by burning through or to melt the oxide layer, as in the case of brazing's case. Thus, this allows welding to be a less invasive process limiting deterioration of the joined member, thus preserving the original form of the joined member, and thus allowing the original properties to be maintained or at least less affected by the process of forming the joinings than in other cases.