Welt

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welt

[welt]
(building construction)
In sheet-metal roofing, a seam consisting of two joined sheets of metal whose edges have been folded over each other and fastened down flat.
A strip of wood fastened over a flush seam or joint for added strength.
(engineering)
A strip that has been fastened to the edges of plates that form a butt joint in a steam boiler.

Welt

A seam in flat metal roof coverings where the edges are folded and dressed down; also called single and double welts, depending on the number of folds.

welt

1. In sheet-metal roofing, a seam which joins two sheets; formed by folding over the edges of the sheets, engaging the folded portions and then dressing them down flat.
2. A strip of wood fastened over a flush seam or joint, or an angle, to strengthen it.