ANSI/ASME B16.25 standard covers the preparation of butt welding ends of piping components to be joined into a piping system by welding.It includes requirements for welding bevels,for external and internal shaping of heavy-wall components,and for preparation of internal ends (including dimensions and tolerances).Coverage includes preparation for joints with the following.
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(a) no backing rings;
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(b) split or non continuous backing rings;
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(c) solid or continuous backing rings;
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(d) consumable insert rings;
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(e) gas tungsten are welding (GTAW) of the root pass. Details of preparation for any backing ring must be specified in ordering the component.
Click here for PDF of ANSI B16.25 -2012- Butt welding Ends. >>>
ASME-ANSI-B16.25-Butt-welding-ends.pdf
If you want to check the full details about the standard, you can buy from following link:
https://www.asme.org/products/codes-standards/b1625-2012-buttwelding-ends
