3.3.4.6. Tacking/Locking Passes: Tacking or locking passes may be used to restrict relative motion in the weld assembly prior to full penetration pass. 3.3.4.6.1. Tacking or locking passes shall be made on areas not to be welded with penetration passes. If such passes have to be made on areas to be welded with penetration passes, tack welds or locking welds shall be completely consumed by penetration welds.3.3.4.6.2. Parameters used for tacking passes shall be established and included in the WPS and PQR.