welt n.
 1. That which, being sewed or otherwise fastened to an edge or border, serves to guard, strengthen, or adorn it; as: (a) A small cord covered with cloth and sewed on a seam or border to strengthen it; an edge of cloth folded on itself, usually over a cord, and sewed down.  (b) A hem, border, or fringe. [Obs.] (c) In shoemaking, a narrow strip of leather around a shoe, between the upper leather and sole.  (d) In steam boilers and sheet-iron work, a strip riveted upon the edges of plates that form a butt joint.  (e) In carpentry, a strip of wood fastened over a flush seam or joint, or an angle, to strengthen it.  (f) In machine-made stockings, a strip, or flap, of which the heel is formed.
 2. Her. A narrow border, as of an ordinary, but not extending around the ends.
 Welt joint, a joint, as of plates, made with a welt, instead of by overlapping the edges.  See Weld, n., 1 (d).

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