Under one step of one embodiment of a solid state method for joining structures, angled edges of at least two structures are disposed adjacent to one another. In another step, a plurality of angled joining members are disposed adjacent to one another between the adjacent angled edges of the at least two structures. In still another step, the angled joining members are welded between the adjacent angled edges of the at least two structures. In yet another step, at least one hole is formed into and extended between adjacent edges of the welded angled joining members. In an additional step, a plug member is forced at least partially into the at least one hole.