Pipe fittings Butt welding Ends

Butt weld fittings is one of the most popular connection type in pipeline systems. It always been required in large quantities in different industries, and especially for the large diameter pipelines.

What is Butt Weld Fittings
Butt weld is to connect pipes or fittings ends by welding. It’s a weldable steel pipe fitting that would allow to branch off, allow for change of direction of flow, attach auxiliary equipment, or reduce the size of the pipe.

In the case of forged steel butt weld fittings, you would find them to be manufactured according to ANSI/ASME B16.9.

We aware the beveling is very important processes in the whole production procession of butt-welding pipe fittings, we always make beveling according to the standard strictly. In the behavior, we make beveling after shot blasting, bevel ends are fully machined by advanced equipment Double Beveling Machine ensure the height, length, thickness, O.D. and I.D. are all qualified.

Welding Bevel acc.to

Our in-hourse R&D team developed bevel ends equipment are good using in thickness 2mm to 20mm pipe fittings, guarantee high efficiency and high quality.

Send us your technical drawings: SunnySteel will supply you with whatever flanges you are looking for.

Nominal wall Thickness : t End Preparation
t<5mm (for austenitic alloy steel
Cut square or slightly chamfer
at manufacturer ‘ s option
Plain Bevel as in sketch ( a ) above
t>22mm Compound Bevel as in sketch ( b ) above

Weld End Preparations

Joining Welding Neck Flanges To Pipe Of Equal Or Lesser Wall Thickness

*For thicker flanges, see ASME B16.9


Weld neck Flanges can be joined to pipe of lesser wall with proper end preparation and joint design.
The recommendations that follow apply to weld neck flanges with standard plain end bevels (as shown above) and with a hub thickness at the bevel no greater than 1 1/2 times the mating pipe thickness.

The thickness of the flange hub at the weld bevel and the pipe shall be in accordance with the design requirements of the applicable section of ASME B31 Code for Pressure Piping.

When the internal offset due to unequal thickness does not exceed 1/2 times the pipe wall thickness, then the rules and figures given on page 75 are recommended as well for joining weld neck flanges to pipe of lesser wall and/or higher strength.

When the additional thickness of the hub at the bevel results in an offset at the outside diameters of the ends to be joined, reference should be made to ASME B31 and ASME B16.5

Bevel Wall Thickness (t) 0.19 In. To 0.88 In. Inclusive

A = Outside Diameter of flange and mating pipe (inches)
B = Inside Diameter of flange (inches)
t = Wall thickness of flange hub at bevel (inches)

For bevel wall thickness over .88″ refer to ASME B16.5
for alternative detail.

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