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Extension of Thickness Range when Impact is required

Extension of Thickness Range when Impact is required

Postby laurudolphy » Wed Jun 29, 2016 11:36 am

hi Welding Folks.

PQR Thickness - 25mm 16" Pipe. Impact Tested
Hence
WPS range with CVN = Min 16mm and above (WPS 1)
WPS range without CVN = 5mm and above (WPS 2)

I would like to extend the thickness range below 16mm. Hence I propose to use a 6mm Plate using (WPS 2) in vertical up 3G position on Plate and after welding do an impact test.
If the results do pass favorably,

Step 1. Include the test results of the CVN on 6mm plate
Step 2. Rewrite WPS 1 and change the range from 16mm to 5mm and above with CVN.

i assume that all other essential variables are followed.

Your opinion will be appreciated.
laurudolphy
 
Posts: 51
Joined: Wed Aug 14, 2013 1:19 pm

Re: Extension of Thickness Range when Impact is required

Postby Ballbearing » Sun Jul 03, 2016 1:10 am

Laurudolphy,
You have posted in the Structural Welding section but it appears to be an ASME IX piping question ?
If it is ASME IX your maximum thickness is 50 mm (QW 451.1) not "and above"
If you qualify an additional coupon of 6 mm your qualified range will be 6 mm (QW 403.6) to 50 mm with CVN.

Don't forget your construction code.
If it is B31.3 your ranges will then be 6 mm to 12 mm and 12.5 mm to 31 mm
Hope that helps,
Cheers,
BB
Ballbearing
 
Posts: 76
Joined: Wed Jun 12, 2013 10:11 pm

Re: Extension of Thickness Range when Impact is required

Postby laurudolphy » Mon Jul 04, 2016 1:55 pm

HI, BB,

Am afraid no, I am referring to AWS D1,1, unfortunately I dont have the code with me right now, but I am referring to the Essential Variables table when CVN is required.

When a 25mm coupon is used in the qualification test, the minimum thickness qualified would be 16mm with CVN or 5 mm without CV.

Hence thought to do a production test at 5 mm get it tested and get the range with CVN to be from min 5mm with or without CVN.

Whats your opinion on this?

Cheers
laurudolphy
 
Posts: 51
Joined: Wed Aug 14, 2013 1:19 pm

Re: Extension of Thickness Range when Impact is required

Postby Ballbearing » Sun Jul 24, 2016 10:55 am

Laurudolphy,
Sorry for the late response.
Your proposal is fine based on what I have available ( the 2010 edition)
Cheers,
BB
Ballbearing
 
Posts: 76
Joined: Wed Jun 12, 2013 10:11 pm


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