Welding Inspection & Metallurgy API ICP Self Study Notes

3.58 throat theoretical: The distance from the beginning of the joint root
perpendicular to the hypotenuse of the largest right triangle that can be
inscribed within the cross-section of a fillet weld. This dimension is based on
the assumption that the root opening is equal to zero.
3.59 transverse crack: A crack with its major axis oriented approximately
perpendicular to the weld axis.
3.60 travel angle: The angle less than 90 degrees between the electrode
axis and a line perpendicular to the weld axis, in a plane determined by the
electrode axis and the weld axis.