Re: [MW:14507] How many times can a weld be repaired without impairing its quality?

Gents,

 

Though the 2 times allowed  in normal is an generic specification and concerned project specs.

 

In my opinion you want to do repair  "n" number of times, the base materials & Consumbles shall be verified for the same by simulation tests.

 

For example, as per API 6A, it specifies separate qualification is required for the repair, doest restrict the number of times .

 

If you want to do three times repair, base materials & welding consumables shall be simulated for the three times to ensure it retaining mechanical properties after three cycle of PWHT time and temperature if undergoes PWHT

 

 

 

On Sat, Jun 9, 2012 at 4:52 PM, sankar bombay <sankar.bombay@gmail.com> wrote:

Dear friend,
   As this condiction we want to check the material hardness... as
per code 2 times we can cut out the joint , after that if u check the
Hadness on material  at heat affected zone , the micro structure will
be have changes due to heat
 My friend Ghost i have accepted ur command max we allowed only twice
, thice is risck of u


regards
sankar.k

On 6/8/12, Tarantula Ghosh <ghosh.tarantula@gmail.com> wrote:
> Dear friends,
> What we must do to take care of this issue is this: When running a PQR,
> also run additional repair PQRs. Repair once, twice, thrice..... with WPS
> conditions and subject welded coupons to mechanical tests (impact mainly)
> and see at what  level you have to stop. Two times repair is just an
> arbitrary statement, not supported anywhere but what I suggest is from the
> point of view of a good engineering practice and more reliable.I hope I am
> not reinventing the wheel !
> Comments, please.
> Thankfully,
> TG
>
> On Thu, Jun 7, 2012 at 10:04 AM, Muthu Samy <jenieragav@gmail.com> wrote:
>
>> Dear Vagal,
>> The repair can be attended for two times only and cut and re weld if
>> repair found again.
>>
>>  [image: Visit Us @ www.MumbaiHangOut.Org]

>> *Muthusamy*@*balu* <Muthusamy@balu>

>>
>>
>> On 6 June 2012 07:33, Shashank Vagal <nach_sam@yahoo.com> wrote:
>>
>>> Gents,
>>> A very sensitive issue for most of us, I am sure from time to time,
>>> particularly when we are working at site with limited inventories at a
>>> given time: How many times can a weld be repaired without impairing its
>>> quality? We are facing a cut out of plate butt weld (9% Ni) with no
>>> additional plates if required to replace the welded ones if they are
>>> condemned.
>>> There was an article some time ago addressing this issue (
>>>
>>>
>>> http://www.twi.co.uk/services/technical-information/faqs/material-faqs/faq-how-many-times-can-a-weld-be-re-weldwed),
>>> but unfortunately it seems to have been taken off from TWI site.
>>>
>>> Please advise.
>>>
>>> Best regards,
>>>
>>> Shashank Vagal
>>>
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>>
>>
>>
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>>
>>
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>
>
>
> --
> Tarantula
>
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--
shankar

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Thanks & regards,

K.Babu

Singapore

 

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