WELDING THEORY - OD1650 - LESSON 1/TASK 1
(c) The size of groove welds with specified root penetration, except square groove
welds, will be indicated by showing both the depth of chamfering and the root penetration,
separated by a plus mark and placed to the left of the weld symbol. The depth of chamfering and
the root penetration will read in that order from left to right along the reference line (figure 12,
views E and F, on the previous page). The size of square groove welds will be indicated by
showing only the root penetration.
(d) The size of flare groove welds is considered as extending only to the tangent
points as indicated by dimension lines (refer to figure 11, view C, on page 26).
(3) Groove Dimensions.
(a) Root opening, groove angle, groove radii, and root faces of the U and J groove
welds will be the user's standard, unless otherwise indicated.
(b) When the user's standard is not used the weld symbols are as follows:
1 Root opening will he shown inside the weld symbol (refer to figure 11, view
2 Groove angle of groove welds will be shown in figure 11, view E.
3 Groove radii and root faces of U and J groove welds will be shown by a cross
section, detail or other data, with a reference to it on the welding symbol, observing the usual
location significance (refer to figure 8, view D, on page 18).
(4) Back and Backing Welds. Bead type back and backing welds of single groove
welds will be shown by means of the back or backing weld symbol (figure 13, view A, on the
(5) Surface Contour of Groove Welds. The contour symbols for groove welds (figure
11, view F) are indicated in the same manner as that for fillet welds.