Definition - What does Weldolet mean?
A weldolet is a branch butt-weld connection fitting that is adhered to an outlet pipe to minimize stress concentrations in the piping area.
Corrosionpedia explains Weldolet
Weldolets are used to provide an outlet area from a larger to a smaller pipe connection point. The weldolet is welded to the larger pipe (the run) and connected to the smaller pipe (the branch).
Weldolet branch connection fittings are used for a variety of metal pipes such as stainless steel, chrome-moly and several other alloys.