jcluf wrote:
> Socket Welds are specifically forbidden in B31.3 Chapter 9 "High
> Pressure Piping" This is because in High pressures the fittings dilate
> due to internal pressure, this dilation puts shear stress across the
> toe of the fillet and can lead to premature pressure based fatiuge
> cracks....
>
> Socket welds may also be prohibited in other codes under some
> cirmcumsatnace as well... check the applicable code thoroughly...
>
> Whats stronger? The butt weld joint has a SIF of 1.0 the SW may be as
> high as 2.1 under some codes. From a thermal and pressure fatiuge
> standpoint the butt weld is significantly stronger.
>
> A compromise between an as welded SW and a butt weld is the unequal
> lwg 2:1 tapered fillet as shown in B31.1 and B31.3 its significantly
> "stronger" than a standard fillet but not as strong as a butt weld.
>
> Of course all welds are only as good as the welder making them!
Agreed!
I like butt welds because it takes time and patience to make them.
Socketwelding leaves too much slop possibility/fudge factor elements.
Paul Received on Mon Jul 25 20:29:00 2005
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