Re: Re: [MW:14367] Time between root pass and hot pass

Hi,

I would assume that time lapse between 1st and 2nd pass would be stated in WPS and PQR, since you exceeded the limit imposed by WPS, it's a non-conformance, talk to client and seek for allowing preheat the pipe and continue welding, no need to cut and reweld the joint straight away without investigating. You could perform hardness tests using protable hardness tester to ascertain client.

I have seen max. time lapse of 30 min. between 1st and 2nd pass.


Cheers,
Manpreet Singh

On Sun, 27 May 2012 21:26:58 +0530 wrote
>DEARS,         Yes, u need to cut and reweld. Mostly hotpass is to burn and float out wagon track present in root pass ,so time between root and hot pass is 5 to 10 minutes


Regards,
SENBE

On Tue, May 15, 2012 at 5:25 PM, jesti fer wrote:


Dear all,
We are doing 20" pipe line project with API 5L Gr.B material as per B31.4, Welding process SMAW (E6010 for root and rest with E 7018, both are up-hill) our welder welded one joint root pass and he kept this joint for long time. But our Qc instructed to cut and re-weld the joint. But the time between root pass and hot pass not mentioned in approved WPS and client specification also.

It necessary to cut and re-weld?
It is mentioned any were in the code (ASME or API)?
 
Please help me,,
  
Best Regards



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