A method of surface roughening in which spiral threads are prepared, followed by upsetting with a knurling tool. See Figure T- 14.
3F
A welding test position designation for a linear fillet weld applied to a joint in which the weld is made in the vertical welding position.
3G
A welding test position designation for a linear groove weld applied to a joint in which the weld is made in the vertical welding position.