Accession Number:

ADA230198

Title:

Performance of Underwater Weldments

Descriptive Note:

Final rept.

Corporate Author:

SOUTHWEST RESEARCH INST SAN ANTONIO TX

Report Date:

1990-09-05

Pagination or Media Count:

253.0

Abstract:

Data reported herein indicate that the wet and wet-backed metal arc welding SMAW process can produce welds suitable for structural applications provided certain limitations of the welds are considered in design. Welding procedure qualification tests and fracture toughness J sub Ic tests were performed on wet, wet-backed, and dry fillet and groove welds made with 1 A-36 steel and E6013 electrodes, and 2 A-516 steel and nickel alloy electrodes. Despite hardness measurement exceeding 300 HV1.0 in ferritic welds and 400 HV1.0 in austenitic welds, no hydrogen cracking or brittle fracture behavior was observed. Generally, the Charpy tests indicated upper-shelf behavior at 28 deg F and the HAZ was found to be tougher than the weld metal. Statistical analysis reveals the effect and inneraction of water depth, plate thickness, restraint, material, and location of notch in the weld. Design guidelines are formulated and illustrated by examples for the use of these welds in structural applications. The fracture toughness of the welds is sufficient to be tolerant of flaws much larger than those allowed under AWS specifications. jhd

Subject Categories:

  • Couplers, Fasteners and Joints

Distribution Statement:

APPROVED FOR PUBLIC RELEASE