Tensile Strength of Scarf Joints in Southern Pine

Factors such as slope of scarf, wood density, matching annual rings, and some gluing variables were studied. Joint strength of plain scarf joints in southern pine varied markedly with slope of scarf, but showed only a slight increase in strength with increased specific gravity. Absolute joint strengths were high when compared with data in the literature, although strength ratios were low because of high-strength controls upon which these ratios were based. Little or no strength variation was associated with ring matching. High-temperature cures were not needed to develop normal dry strength when cold-setting urea and resorcinol-type adhesives were used. Four slopes, 1:6, 1:9, 1:12, and 1:15 were used in this study. The wood used was largely loblolly pine; small amounts of shortleaf and longleaf pine may have been included.

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