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
1. To press or beat into intimate and permanent union, as two
pieces of iron when heated almost to fusion.
Note: Very few of the metals, besides iron and platinum. are
capable of being welded. Horn and tortoise shell
possess this useful property.
2. Fig.: To unite closely or intimately.
Two women faster welded in one love. --Tennyson.