the present invention is a method for constructing a solid state diffusion bonded connection which is homogeneous , capable of efficiently transmitting stress and capable of being analyzed . the method provides for the achievement of homogeneous filleted junctures which are required by long - life structural fatigue specifications . the method also provides a mechanical interlock feature which produces a fail - safe connection . by the invented method , only the amount of material required to form the desired structural connection is used . the members to be joined are cut from sheets or plates of a wrought alloy such that a predetermined amount of metal is available to produce the diffusion bond and specified filleting . minimum force is required to produce the connection since only localized plastic flow diffusion bonding is required in the vicinity of the juncture of the members . the formed connection is homogeneous and has the same properties across the connection as the parent material . the invented method comprises the steps of determining joint flow volumes , establishing ram action tooling and pressure requirements , establishing the restraining tool configuration ; assembling the members and tooling in a die assembly ; heating the assembly in a vacuum to just below transformation temperature , and applying pressure to the members to cause creep and plastic flow .