This paper advocates correlating rolling torque or hydraulic expanding pressure with shear load strength instead of percent wall reduction as the criterion of expanding adequacy for thin-walled tubes. It compares magnitudes of measurements required to estimate wall reduction with cumulative hole-drilling and tube-manufacturing tolerances and graphically illustrates data scatter increase with ratio of tube diameter to wall thickness. As background it discusses expanding theory. It covers hydraulic, roller and hybrid expanding. It describes appropriate annular groove widths for hydraulic and hybrid expanding and concludes with comments on tube rolling procedure specifications and recommendations for two-stage and hybrid expanding.

Issue Section:
Technical Papers
Keywords:
shear strength, rolling, deformation, joining processes, Hybrid Expanding, Hydraulic Expanding, Rolling Procedure, Pullout, Pushout, Shear Load, Tube Expanding, Tube Rolling, Two Stage Expanding, Wall Reduction
Topics:
Condensers (steam plant), Deformation, Pressure, Rollers, Shear (Mechanics), Stress, Titanium, Torque, Yield stress, Wall thickness, Steam, Manufacturing, Metals, Clearances (Engineering), Drilling, Electromagnetic scattering
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Copyright © 2004
 by ASME
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