SYMPOSIA PAPER Published: 01 January 1997
STP12324S

Effect of Weld Metal Mismatch on Joint Efficiency and Measured Fracture Toughness

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Fracture toughness tests of deep-notched and shallow-notched SENB specimens at various sub-zero temperatures were conducted to study the effect of weld metal mismatch on measured fracture toughness. Tensile tests of cross-weld tensile specimens were also conducted to study the effect of weld metal mismatch on joint efficiency. These specimens were machined from butt welds that were fabricated with the same welding consumable and welding procedure using HSLA 100 steel plates heat treated to different tensile strengths. No significant differences were found between the joint efficiencies and ductilities of the cross-weld tensile specimens with overmatching weld metal and those of specimens with up to 9% weld metal undermatch in terms of yield strength (3% in terms of ultimate tensile strength). Furthermore, 100% joint efficiency was still achieved in the cross-weld tensile specimens with intact reinforcements and 17% undermatching weld metal in terms of yield strength (9% in terms of ultimate tensile strength). No correlation was found between the degree of weld metal mismatch and the measured fracture toughness of the SENB specimens.

Author Information

Yee, R
Fleet Technology Limited, Kanata, Ontario, Canada
Malik, L
Fleet Technology Limited, Kanata, Ontario, Canada
Morrison, J
Esquimalt Defence Research Detachment, CFB Esquimalt, Victoria, B.C., Canada
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Details
Developed by Committee: E08
Pages: 450–468
DOI: 10.1520/STP12324S
ISBN-EB: 978-0-8031-5374-5
ISBN-13: 978-0-8031-2410-3