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A qualified weld procedure is essential because it ensures that the welding technique meets specific standards for strength and quality. This type of procedure requires that all aspects of welding, including tack welds, are carefully evaluated and tested to ensure they can withstand the stresses and demands of the intended application. Tack welds, although often temporary, play a crucial role in holding pieces in place before the final welds are made and must be reliable.

The requirement for qualification means that not only the main welding process but also the tack welds need to be tested under certain conditions to demonstrate their adequacy. This is especially important in critical applications, where any failure could lead to significant safety issues or structural integrity problems. By qualifying tack welds, the procedure ensures that these small but important joints meet the necessary performance criteria.

The other options either do not require such qualification or imply a less stringent process, thereby not addressing the specific need for verifying the quality of tack welds in significant weld procedures.