Because junctions are where materials with different ages, pressures tolerances, and corrosion behaviors are asked to behave as one system. Galvanized meeting copper also sets up a galvanic couple that accelerates corrosion at the joint itself. The honest scope reads the junction as its own diagnosis, replaces back to sound material on both sides where the readings demand it, and writes that boundary down, instead of patching the wettest inch and leaving the couple in place.
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