The Collaborative International Dictionary of English v.0.48:

Weld \Weld\, n.
   The state of being welded; the joint made by welding.
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   Butt weld. See under Butt.

   Scarf weld, a joint made by overlapping, and welding
      together, the scarfed ends of two pieces.
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The Collaborative International Dictionary of English v.0.48:

Weld \Weld\ (w[e^]ld), v. t.
   To wield. [Obs.] --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Weld \Weld\ (w[e^]ld), n. [OE. welde; akin to Scot. wald, Prov.
   G. waude, G. wau, Dan. & Sw. vau, D. wouw.]
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   1. (Bot.) An herb (Reseda luteola) related to mignonette,
      growing in Europe, and to some extent in America; dyer's
      broom; dyer's rocket; dyer's weed; wild woad. It is used
      by dyers to give a yellow color. [Written also woald,
      wold, and would.]
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   2. Coloring matter or dye extracted from this plant.
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The Collaborative International Dictionary of English v.0.48:

Weld \Weld\, v. t. [imp. & p. p. Welded; p. pr. & vb. n.
   Welding.] [Probably originally the same word as well to
   spring up, to gush; perhaps from the Scand.; cf. Sw.
   v[aum]lla to weld, uppv[aum]lla to boil up, to spring up,
   Dan. v[ae]lde to gush, G. wellen to weld. See Well to
   spring.]
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   1. To press or beat into intimate and permanent union, as two
      pieces of iron when heated almost to fusion.
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   Note: Very few of the metals, besides iron and platinum. are
         capable of being welded. Horn and tortoise shell
         possess this useful property.
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   2. Fig.: To unite closely or intimately.
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            Two women faster welded in one love.  --Tennyson.
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WordNet (r) 3.0 (2006):

weld
    n 1: European mignonette cultivated as a source of yellow dye;
         naturalized in North America [syn: dyer's rocket, dyer's
         mignonette, weld, Reseda luteola]
    2: United States abolitionist (1803-1895) [syn: Weld,
       Theodore Dwight Weld]
    3: a metal joint formed by softening with heat and fusing or
       hammering together
    v 1: join together by heating; "weld metal"
    2: unite closely or intimately; "Her gratitude welded her to
       him"