Weldolate is self-reinforced branch fittings suitable for butt welding.
It is used in piping to take branches from the run pipe without using a reinforcement pad.
A reinforcement pad is welded around the branch to compensate for the weakness created by a hole in the run pipe to take the branch.
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You can see this in the top image.
But you can use heavier, specially designed olets that work as self-reinforced branches. You can see this in the bottom image.

Olets – A Complete Guide – Learn about Weldolet, Sockolet, Elbolet, & more. Check this to learn more about olets used in piping.
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