Static Tensile and Brittle Fracture Strengths of Soft Welded Joints
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Static tensile and brittle fracture behaviors of the welded joints having weld metal whose strength is lower than it of base metal, or soft welded joints, are investigated. The strength of the welded joints having soft weld metal is much elevated from it of the soft weld metal itself. It is effective to use soft weld metal in a part of weld metal from the viewpoint of efficiency of strength. The "Soft Ratio" Sr of weld metal required to guarantee the standard strength and the elongation of welded joints are considered. When Sr (=<σ_u>^W/<σ_u>^B)≧0.93, ultimate tensile strength and elongation of all kinds of soft welded joints become almost equal to those of base metal. The brittle fracture strength of welded joints is affected more considerably with fracture toughness than yield strength of weld metal. The soft welded joints whose fracture toughness is a little better than it of the ordinary weld metal guarantee the sufficiently brittle fracture strength.
- Transactions of JWRI
Transactions of JWRI 2(1), 73-80, 1973