ASME B16.25:2017 pdf free download

ASME B16.25:2017 pdf free download.Buttwelding Ends.
3.1 BeveLs for Other Than GTAW Root Pass
(a) Components having nominal wall thicknesses of 3 mm (0.12 in.) and less shall have ends cut square or slightly chamfered.
(b) Components having nominal wall thicknesses over 3 mm (0.12 in.) to 22 mm (0.88 In.) Inclusive shall have single angle bevels as illustrated in Figure 2.
(c) Components having nominal wall thicknesses greater than 22 mm (0,88 in.) shall have compound angle bevels as illustrated in Figure 3.
3.2 BeveLs for GTAW Root Pass
(a) Components having nominal wall thicknesses of 3 mm (0.12 in.) and less shall have ends cut square or slightly chamfered.
(b) Components having nominal wall thicknesses over 3 mm (0.12 in.) to 10 mm (0.38 in.) inclusive shall have 37’/2.deg ± 2’/2-deg bevels or slightly concave bevels (see Figure 4).
(c) Components having nominal wall thicknesses over 10 mm (0.38 in.) to 25 mm (1.0 in.) inclusive shall have bevels as shown in Figure 5.
(d) Components having nominal wall thicknesses greater than 25 mm (1.0 in.) shall have bevels as shown in Figure 6.
3.3 Outside Diameter at WeLding Ends
Dimension A shall be either that specified in the applicable component standard or that specified In the purchaser’s component specification. In the absence of a requirement for dimension A in a component standard or a purchaser’s specification, the values for dimension A in Table 1 or Table I-i may be used.
4 PREPARATION OF INSIDE DIAMETER OF WELDING END
4.1 General
Preparation of the inside diameter at the end or a component shall be in accordance with one of the following, as specified by the purchaser:
(a) Components to be welded without backing rings shall meet the requirements of the standard or specification for the component.
(b) Components to be welded using split or noncontinuous backing rings shall be contoured with a cylindrical surface at the end as shown in Figure 2, illustration (b) and Figure 3, illustration (b). If the backing ring contour is other than rectangular, details must be furnished by the purchaser.
(c) Components to be welded using solid or continuous backing rings shall be contoured with a cylindrical or tapered surface at the end as specified by the purchaser. End preparation is illustrated in Figure 2, illustration (c) and Figure 3, illustration (c) for rectangular ends and in Figure 2. illustration (d) and Figure 3. Illustration (d) for tapered ends.
(d) Components to be welded using consumable insert rings or GTAW root pass shall be contoured with a cylindrical surface at the end as shown in Figures 4 through 6.
4.2 Dimension C
Values for dimension C shown In Figure 2, illustrations (c) and (d); Figure 3, illustrations (c) and (d); and Figures 5 and 6 can he determined by the following equations.