Patent ID: 9539670
Date: 2017-01-10
CPC Classifications: B23K,F16B,F16D,F16L

Claim:
1. A tube joint joining a first tube to a second tube, comprising: a first tube and a second tube of equal outside diameter, the first tube and the second tube being of equal inside diameter; first locking pieces cut from a tube of a first material, said first locking pieces including lateral extensions, said first locking pieces include radial cut faces on all axially aligned portions of cut surfaces; second locking pieces cut from a tube of a second material, the second material being a different material than the first material, said second locking pieces including lateral extensions, said second locking pieces include radial cut faces on all axially aligned portions of cut surfaces; said first locking pieces and said second locking pieces arranged in interlocking relation with said lateral extensions of said respective first locking pieces engaging said lateral extensions of second locking pieces and with the radial cut faces of the first locking pieces and the radial cut faces of the second locking pieces distributed circumferentially around the joint so as to constrain relative movements between the parts; said first locking pieces being welded to said first tube by a first weld and said second locking pieces being welded to said second tube by a second weld, the first material not being welded to the second material; wherein the first tube is joined to the second tube at the tube joint, the tube joint being of the same outside diameter as the outside diameter of the first and second tubes, the tube joint being of the same inside diameter as the inside diameter of the first and second tubes so that the tube joint joins the first tube in end to end relation with the second tube without increasing a wall thickness at the tube joint; and wherein said first and second locking pieces are of substantially the same size and shape, said first and second locking pieces each having a base portion, the first weld connecting the base portion of the first locking piece to the first tube, the second weld connecting the base portion of the second locking piece to the second tube; the first and second locking pieces having lateral extensions extending from opposite sides of said base portion.