What constitutes a weld repair
Johnson, David
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
__CONFIDENTIAL:
Clyde Union DB Limited
Incorporated in England & Wales – Number 331925
Registered Office – Green Road, Penistone, Sheffield S36 6BJ, England
The information contained in this email (including any attachments) is confidential, subject to copyright and for the use of the intended recipient only. If you are not the intended recipient please delete this message after notifying the sender. Unauthorised retention, alteration or distribution of this email is forbidden and may be actionable.
Attachments are opened at your own risk and you are advised to scan incoming email for viruses before opening any attached files. We give no guarantee that any communication is virus-free and accept no responsibility for virus contamination or other system loss or damage of any kind.
Bathula Raghuram (Mumbai - PIPING)
What is your product specification?
.
Johnson, David
Mostly A216 WCB Castings
But also on castings - A487CA6NM – A351CF8 – A351CF8M - A487CA6NM – A890 Grade 5 A
Best Regards
Dave J
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
Raj
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.
> But also on castings - A487CA6NM - A351CF8 - A351CF8M - A487CA6NM - A890 Grade 5 A
> Registered Office - Green Road, Penistone, Sheffield S36 6BJ, England
> The information contained in this email (including any attachments) is confidential, subject to copyright and for the use of the intended recipient only. If you are not the intended recipient please delete this message after notifying the sender. Unauthorised retention, alteration or distribution of this email is forbidden and may be actionable.
>
> Attachments are opened at your own risk and you are advised to scan incoming email for viruses before opening any attached files. We give no guarantee that any communication is virus-free and accept no responsibility for virus contamination or other system loss or damage of any kind.
> .
>
> --
> To post to this group, send email to material...@googlegroups.com
> To unsubscribe from this group, send email to materials-weld...@googlegroups.com
>
> ________________________________
> __CONFIDENTIAL:
>
> Clyde Union DB Limited
> Registered Office - Green Road, Penistone, Sheffield S36 6BJ, England
Johnson, David
Thanks for your guidance
Could you please tell me regarding the ASTM specs what would be considered as an upgrade?
Best Regards
______________________________________
David Johnson
Quality Engineer
CLYDEUNION
Green Road
Penistone
Sheffield
S36 6BJ
É: 01226 222 278
É: 07554 669 106
Ê: 01226 222 301
Clyde Union DB Limited
Registered Office Green Road
Penistone,Sheffield
England S36 6BJ.
Company No 331925
Hi,
Cheers!
Rajasekhar.
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
__CONFIDENTIAL: