The angle with respect to application in the symbol is the groove angle which, for bevel- and Jgrooves,
will also be the bevel angle. However, it is the groove angle (the angle contained between
the fusion faces of the groove) that appears in the welding symbol.
The angle at the root of the joint associated exclusively with J- and U-grooves has strong design
implications, as the governing specifications make the applicable effective throat of welds in such
grooves a function of this particular angle.
In conjunction with this angle, it should also be noted that the minimum groove radius for the J- and Ugrooves
is given in CSA W59 and AWS D1.1 for prequalified joints.