1. tack weld - Noun
2. tack weld - Verb
tack weld (third-person singular simple present tack welds, present participle tack welding, simple past and past participle tack welded)
To position and secure pieces of work using small welded joints at isolated points (typically, in preparation for the final weld).
tack weld (plural tack welds)
A small, isolated weld used to position and secure pieces of work (typically, in preparation for the final weld).