Be aware that the Volvo welding symbols are a subset of the ISO welding symbols. There may be some differences between the two. Just rembember that in the ISO welding symbol system the dotted line represents the "other side" of the weld joint and can be above or below the solid reference line. Thus, the welding symbol on the dotted line represent the weld on the other side of the joint and can be below or above the reference line.
Good luck - Al