Difference in between ground smooth and ground flush jont

[yash yagnik]

Dear All,

Please differentiate two terminology of ground smooth and ground flush in fabrication.

We are facing issue in this regards. Kindly give any back up supporting documents from where the definition is derived.

Regards

Yash Yagnik

[rajesh ac]

Dear   SMOOTH MEANS - NO SHARP EDGES  LIKE A CURVATURE FINISH   GROUND FLUSH  MEANS  -IN CASE OF ORIFICE FLANGES INSIDE  WELD  WE DO GRINDING AND  MATCH WITH BASE METAL THICKNESS     REGARDS RAJESH   --- On Thu, 6/7/12, yash yagnik <yash...@gmail.com> wrote:

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[yanfei Xiu]

Dear,

I havn't ever seen any code to specify the definition of such both terms.

basically,1:3 transition used to be further described for grinding smooth.

smooth is required to avoid the stress concentration.while flush is usually for the requirement of assembly and fit-up.

2012/6/7 rajesh ac <raje...@yahoo.com>

--

[Biswajit Mukherjee]

Dear Yash,

'Ground Smooth' is related to surface finish -- may be a machined
component or even an unmachined one like a plate. Whether the grinding
finish has been 'smooth' will depend on what Roughness value you have
achieved by measurement in microns (called Ra & Rz values).

'Ground Flush' is relative to the surrounding. For example, in
fabrication, if you have ground off the reinforcement of a weld and
made it level with that of the base metal it would be 'ground flush'.
If you have further ground it off, so that the weld is below the base
metal's either or both surfaces, you have 'underflushed' it.

I am sure you can find more in an Engineer's Handbook. But I feel both
are subjective shop floor expressions and are not very scientific.

Hope this helps.

Regards
BM


-----materi...@googlegroups.com wrote: -----

To: material...@googlegroups.com
From: yash yagnik
Sent by: material...@googlegroups.com
Date: 06/07/2012 01:27PM
Subject: [MW:14481] Difference in between ground smooth and ground flush jont

[sevak hiren]

I assume ground flush is no weld reinforcement at all, smooth means only removing sharp edges / burs / irregularity of surface of welds.

 

 

UG-82 LUGS AND FITTING ATTACHMENTS

(a)

When pressure parts, such as saddle type nozzles, manhole frames, and reinforcement around openings, extend over pressure retaining welds, such welds shall be ground flush for the portion of the weld to be covered.

(b)

When nonpressure parts, such as lugs, brackets, and support legs and saddles, extend over pressure retaining welds, such welds shall be ground flush as described in (a) above, or such parts shall be notched or coped to clear those welds.

5-4 FABRICATION

5-4(c)

Longitudinal welds shall be ground flush and smooth on both the inside and outside surfaces prior to being formed into expansion elements.Also see

Mandatory Appendix 1, FIG. 1-6 (d) DISHED COVERS WITH BOLTING FLANGES , where

smooth weld is shown.

 

Regards

 

 

Yash Yagnik