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. välla to weld, uppvälla to boil up, to spring up, Dan. vælde to gush, G. wellen to weld. See Well to spring.]
from Websters 1913 - gush/pour?