weld reinforcement grinding 1

[fazel1]

is there any limitation in grinding the welds of shell to shell joints when fabrication of the vessel is based on ASME SecVIII div1? can we flush theweld totally by grinding?

 

[unclesyd]

Unless things have changed there is not limitation on smoothing a weld. The caveat is not to thin the material in the area of the weld.
A term sometimes used for this procedure is plannish even though p;annish really refers to hammering or rolling.

It is a require for all our equipment used in polymer manufacture. We will also planish welds of NDT testing. Even fillet welds will get smoothed out for PT testing.

 

[metengr]

Yes, as long as you do not violate design minimum wall thickness.

 

[waskillywabbit]

I've yet to see a pressure vessel be fabricated yet in our shop where the shell to shell butt joints (welds) weren't ground flush. It seems to be a pretty standard practice in the industry.

Brian

 

[chicopee]

If the weld reinforcement is left in place, then the weld efficiency is no longer 100%- in full penetration welded butt joints, weld efficiency will be reduced to what I think back is 90%.

 

[metengr]

If the weld reinforcement is left in place, then the weld efficiency is no longer 100%- in full penetration welded butt joints, weld efficiency will be reduced to what I think back is 90%.[/quote chicopee]

Weld reinforcement is permitted based on the thickness and category of the welds (B&C for butt and other welds) per UW-35 for longitudinal and circumferential joints.

 

[chicopee]

yeah,but efficiency suffers.

 

[aclark]

Weld reinforcement has nothing to do with efficency. Maybe you are thinking about Section I? Up untill the 1980's you only got 100% when the reinforcement was removed. Review UW 11 and 12.