Weld symbol and annotation question.

[ApexM0Eng]

I am trying to find reference for the correct weld symbol and annotation for drawings to use for the following weld:

Purged - Sanitary , Tig Weld

Used on 1.5" stainless tubing.

Would someone know what the proper symbol is?

 

[tbuelna]

Probably a single sided butt weld with a flag note describing the exact process used for the weld, including back purging, the filler alloy to be used, fit-up requirements, NDI of the weld joint, and post weld processing such as planishing or smoothing the internal flow surfaces.