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The statement that seal welds may be used to avoid leakage on B31.5 and should not be considered as contributing strength is accurate. Seal welds are primarily designed to prevent leakage rather than to provide structural strength to the joint. They are often used in applications involving piping systems for fluids, particularly in scenarios where a complete seal is essential for system integrity, such as in refrigeration or chemical processes addressed by B31.5.

The distinction here is that while seal welds can help in maintaining a leak-proof connection, they should not be relied upon to bear significant loads or stresses. Thus, their role is more about providing containment of the fluid rather than contributing to the overall mechanical strength of the assembly. This clarification is crucial for engineers and technicians working with piping systems to ensure appropriate design and safety considerations are implemented in line with the standards outlined in B31.5.