Definitions for "Seal weld"
Keywords:  weld, leakage, tightness, leak, bead
Welding each bar on sides, top and bottom. Welded completely.
Welding that is done to present a leak such as when a weld bead is laid where a pipe is screwed into a fitting.
A weld that does not contribute anything to the mechanical integrity of an assembly, but is made purely to seal or prevent leakage from, for instance, a threaded joint.