Re: [MW:28151] Weld bead length

Hi

 

I rather prefer to use the word single "pass" instead of your single "bead" mentioned.

 

Bead is the maximum width of weld metal deposited either by stringer or weaving, which may be allowed Not more than 3 times of your diameter - practical limitation

 

Pass is the no of layers deposited either by single run or multiple run

 

Bead is NOT essential & isn't a code requirement in general case, but Pass has requirement.

 

Change in multiple to single pass/side is supplementary variable as per QW-410.9

What is the sequence used in your PQR ?

 

For Beads, There is restriction in Sec 8 –UCS 56 (4)(-a) for weld repairs after PWHT - The maximum bead width shall be four times the electrode core diameter

 

Since you are welding LTCS material, which have more effect on your impact requirement. Because of faster cooling rates and subsequent metallurgical effects.

Thanks and Regards

Rameshkannan Devaraj

"What you have learned is a mere handful; What you haven't learned is the size of the world – Avvaiyar"

On Sat, Jul 28, 2018 at 10:55 AM, Nadakuditi kiran kumar <kinnu78@gmail.com> wrote:

Thank you very much for your suggestions, we will implement the same sir
Thanks & Regards

N.Kiran kumar,

On Fri, 27 Jul 2018 at 12:05, Kannayeram Gnanapandithan
<kgpandithan@gmail.com> wrote:
>
> By doing multi run, u can improve toughness properties. Start with left and again start with right and finish at the centre .
>
> On Fri, 27 Jul 2018 11:13 am Nadakuditi kiran kumar, <kinnu78@gmail.com> wrote:
>>
>> Dear Steve,
>> Thanks for your suggestion, but my client asking us to start multi run welding after hot pass, actually we are doing multi run for cover pass. As it is very difficult to weld multi run in narrow groove.
>>
>> On Fri 27 Jul, 2018, 9:14 AM 'Steve Burik' via Materials & Welding, <materials-welding@googlegroups.com> wrote:
>>>
>>> All,
>>>
>>> Your client is right, multi bead welding  for cover pass - with SMAW - ensures fine grain weld metal and eliminates the risk of undercut which is the result of high amperage and incorrect electrode control.
>>>
>>> regards,
>>>
>>> Steve Burik, IWE
>>>
>>>
>>>
>>> On ‎Thursday‎, ‎July‎ ‎26‎, ‎2018‎ ‎11‎:‎59‎:‎59‎ ‎AM, Nadakuditi kiran kumar <kinnu78@gmail.com> wrote:
>>>
>>>
>>> Dear Gentlemen,
>>> We are doing welding of LTCS materials, while welding some of the
>>> joints we welded final run in single bead which is as per approved
>>> WPS(3 x electrode dia.)  Our client is asking us to do multi bead
>>> welding above 6" pipe even though the gap in groove is below 9 mm. We
>>> are using 3.15 electrode to do the final run. We are maintaining heat
>>> in put in control. Please clarify me whether it is correct or not?
>>>
>>> Thanks & Regards
>>>
>>> N.Kiran kumar,
>>>
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