websplice

Notes on Welds and Web Splices, let's see what this say.

Notes about field vs shop welds.

Refering to two different types of welds, CJP and PJP,

apparently just the arrow or the values of the effective throat sides are posted,
I guess that at a complete joint penetration (CJP) yoo don't really need to specify the size of the leg.

Seems like the triangle below the sign represent a fillet weld, I believe the side of the triangle implies the location of the weld on a plate.

Somehow, structural Steel shall meet the requireemnts of AASHTO M270... this value probably has a representation outside of the AASHTO standard, something like Grade 50 steel?

I searched the web, the response:

AASHTO M270 Steel - Grade 50, 50W | Leeco Steel, LLC

https://www.leecosteel.com/aashto-m270-steel.html

AASHTO has its own set of specifications for plate steel used in bridges the M270 steel plate is the same as the ASTM 709 there are times when AASHTO are ...