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Seal welding of threaded joints on a hot water boiler is not considered a strength pass because the purpose of seal welding is to provide a leak-tight seal rather than to enhance the structural integrity of the joint. Threaded connections rely on the inherent properties of the threads for mechanical strength, and while seal welding can help prevent leaks, it does not contribute to the strength of the joint itself.

In many cases, a strength pass refers to tests or inspections that validate the structural capabilities of a joint or component under operational conditions. Since seal welding does not fundamentally alter or strengthen the threaded connection, it does not meet the criteria typically associated with a strength pass. Instead, strength passes would typically involve welds or joints that are designed specifically to withstand mechanical loads and stresses.

Thus, the distinction between seal welding and strength-related welding practices indicates that the answer to the question is indeed false.