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Shielded metal arc weldments were made using 2¼Cr-1Mo alloy steel electrodes (AWS 5.5 Class E9018-B3) and 1¼Cr-½Mo alloy steel plates (ASME SA387 Grade 11 Class 2). The properties of these 38-mm (1½-in.)-thick weldments are compared in two conditions: (1) peened (all beads except the first and last layers were peened for 0.5 min), and (2) postweld heat treated (PWHT) at 704°C (1300°F). Both all-welded and transverse weld properties are compared.
The hardness, yield strength and tensile strength (at both room and elevated temperature), and stress rupture strength for the peened weldments are higher than for the PWHT weldments. The creep rates for the peened weldments are lower than for the PWHT weldments.
In general, the ductility and stress corrosion properties for the PWHT weldments are better than for the peened weldments.
2¼Cr-1Mo weld, 1¼Cr-½Mo base, peened, postweld heat treated, hardness, tensile, stress rupture, creep rate, stress corrosion
Materials Engineer, Westinghouse Electric Corporation, Philadelphia, Pa.