Welding Inspection & Metallurgy API ICP Self Study Notes

10.4 MECHANICAL PROPERTIES
The mechanical properties of base metals, filler metals and of completed
welds are of major importance in the consideration of the design and
integrity of welded structures and components. Engineers select materials
of construction that provide adequate strength at operating temperatures
and pressures. For the inspector, verification that mechanical properties
meet the design requirements is essential. Inspectors should understand
the underlying principles of mechanical properties and the nature of tests
conducted to verify the value of those properties. This is one of the
fundamental principles of performing welding procedure qualification tests.
Examples of mechanical properties of metals and alloys are,
1. the tensile strength,
2. yield strength,
3. ductility,
4. hardness, and
5. toughness.