What is "welt joint"

welt \welt\ (w[e^]lt), n. [OE. welte, probably fr. W. gwald a hem, a welt, gwaldu to welt or to hem.]

1. That which, being sewed or otherwise fastened to an edge or border, serves to guard, strengthen, or adorn it; as:

   1. 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.

   2. A hem, border, or fringe. [Obs.]

   3. In shoemaking, a narrow strip of leather around a shoe, between the upper leather and sole.

   4. In steam boilers and sheet-iron work, a strip riveted upon the edges of plates that form a butt joint.

   5. In carpentry, a strip of wood fastened over a flush seam or joint, or an angle, to strengthen it.

   6. 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.

3. A raised ridge on the surface of the skin, produced by a blow, as from a stick or whip; a wale; a weal; as, to raise welts on the back with a whip.

   Syn: wale; weal; wheal.

4. A blow that produces a welt[3].

   Welt joint, a joint, as of plates, made with a welt, instead of by overlapping the edges. See Weld, n., 1 (d) .