[MW:8505] Re: What constitutes a weld repair

Hi,

We shall consider as a repair if any of the following exists!

1) If there is a leak in the hydrotest.
2) The depth of any cavity prepared for repair welding exceeds 20 % of
the wall thickness or 1 in. [25 mm], whichever is smaller (e.g If the
casting is having a defect of 25mm in a 100mm thk casting i.e defect
is grater than 25% = It is a repair)
3) Any cavity prepared for welding is greater than approximately 10 in.
2 [65 cm2]

For point no 2 & 3, if the depth & area are exceeding bcos of any
reason shall be treated as a repair.

Also if we have done welding bcos of above reasons, we have to
carryout the NDT & PWHT depend on the material specification.

As per ASTM A216:-

10. Repair by Welding
10.1 Repairs shall be made using procedures and welders
qualified under Practice A 488/A 488M.
10.2 Weld repairs shall be inspected to the same quality
standards that are used to inspect the castings. When castings
are produced with Supplementary Requirement S4 specified,
weld repairs shall be inspected by magnetic particle examination
to the same standards that are used to inspect the castings.
When castings are produced with Supplementary Requirement
S5 specified, weld repairs on castings that have leaked on
hydrostatic test, or on castings in which the depth of any cavity
prepared for repair welding exceeds 20 % of the wall thickness
or 1 in. [25 mm], whichever is smaller, or on castings in which
any cavity prepared for welding is greater than approximately
10 in.2[65 cm2], shall be radiographed to the same standards
that are used to inspect the castings.
10.3 Castings containing any repair weld that exceeds 20 %
of the wall thickness or 1 in. [25 mm], whichever is smaller, or
that exceeds approximately 10 in.2[65 cm2] in area, or that was
made to correct hydrostatic test defects, shall be stress relieved
or heat-treated after welding. This mandatory stress relief or
heat-treatment shall be in accordance with the procedure
qualification used.

Cheers!

Rajasekhar.

On Dec 2, 2:29 pm, "Johnson, David" <djohn...@clydeunion.com> wrote:
> Mostly A216 WCB Castings
>
> But also on castings - A487CA6NM - A351CF8 - A351CF8M - A487CA6NM - A890 Grade 5 A
>
> Best Regards
>
> Dave J
> ________________________________
> From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram (Mumbai - PIPING)
> Sent: 02 December 2010 10:48
> To: 'materials-welding@googlegroups.com'
> Subject: [MW:8487] RE: What constitutes a weld repair
>
> What is your product specification?
>
> From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Johnson, David
> Sent: Thursday, December 02, 2010 4:00 PM
> To: materials-welding@googlegroups.com
> Subject: [MW:8486] What constitutes a weld repair
>
> Please give guidance
>
> There is a lot of confusion and different interpretations as to what exactly is a weld repair and what exactly is (an upgrade),
> Especially when it comes to the Post Weld Heat Treatment.
>
> I know what the ASTM says and it is generally 20% of wall thickness etc etc,
> But this to me seem to be a very grey area and for someone with limited knowledge such as me it doesn`t really  answer the question,
>
> Lets for instance say that you have a casting wall that is 100mm thick that has a defect/porosity, you grind or machine that out 25mm to clear the defect, is that a repair?
>
> Lets for instance use the same casting same dimensions this time a machinist makes an error and machines a 25mm hole in the wrong place
> Is this an upgrade?
>
> Next for surface area welds
>
> A casting has severe defects on a face that requires lots of grinding and digging out of the face, it is then welded to replace the removed material and the surface area is 80sq in , is that a weld repair?
>
> An exact casting has been checked and for whatever reason is short of material for machining, it is then welded to size, the material and the surface is calculated to be 80sq in , is this an upgrade??
>
> To me it seems  the ASTM can almost be read to suit , this doesn`t really give a definitive answer, I know that there are different materials that require PWHT but generally the materials that we use all have this section on the specs ,
>
> Please give guidance
>
> Regards
>
> Dave j
>
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