Bevel
The end preparation machined on a butt weld fitting to ASME B16.25 so it matches the welding procedure.
Standard bevel is 37.5 degrees with a 1.6 mm root face for walls up to about 22 mm; heavier walls use a compound bevel. Where the fitting and pipe differ in wall, the thicker component is taper bored internally at a maximum 1:3 slope so the bore lines up — skipping that taper leaves a stress riser exactly where the weld root is.
Related terms
Where this applies
butt-weld-fittings, stub-ends-spools
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