3.10.2 Melt-thru Symbol
Occasionally, there are conditions in a joint in which full or complete joint penetration is required that
permit welding only from one side. As a visible manifestation of such penetration, a reinforcement may
be specified for the other side.
This reinforcement may be conveniently expressed by a melt-thru symbol, together with its required
height, or without it when a specific height is of no significance.
3.10.3 Contour Symbol and Finishing of Welds
Sometimes it is required to specify the contour of the weld surface. It is important for certain structures
or mechanical components to minimize stress concentrations. When mechanical means are intended
to obtain the desired contour, the supplementary contour symbols should be used with the user’s
preferred mechanical means specified to obtain it.