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The welder's hammer is specifically designed to assess the severity of corrosion on a container's structure. It allows for the inspection of the metal by providing a means to tap on the surface, which can help identify weak or compromised areas due to corrosion. When the hammer is struck against the container, the sound and feel of the impact can indicate whether the metal is solid or if it's been weakened by rust and deterioration. This tool effectively facilitates a hands-on evaluation, helping inspectors detect hidden corrosion that may not be visible to the naked eye.

In contrast, a measuring tape is primarily used for measuring distances and dimensions but does not provide any insights into the material integrity or corrosion levels. Similarly, a long straight edge is utilized for ensuring surfaces are flat or straight rather than testing for structural issues. A pipe wrench is designed for gripping and turning pipes and does not have a role in assessing corrosion. Hence, the welder's hammer is the most appropriate tool for determining the severity of corrosion on a container's structure.