[MW:1670] Re: Buttering on Plate

Buttering or weld built up for 55 mm thickness is not admissable nor economical. It also induces high stresses and  may result in plate edge distortion. Maintaining thickness is nother problem.

Placing a bcking strip also calls for more weld consumables.

best way is to provide a plate of  150 mm or more width, trim the  existing shell suitably and weld 2 seams instead of weld built up for 55 mm.

Please check whether API-653 suggest any minimum shell width.

T.B.N.Tagore

On Sat, Feb 28, 2009 at 4:29 AM, Radhakrishnan Venkatraman <r_venkat68@hotmail.com> wrote:

55 mm gap should not be done with buttering.here the thickness is  23.4mm.Presume that the gap is produced for vertical welding the problem shall be solved by providing backing plate of suitable thickness say 12mm or even 16mm.UT results shall be checked for crack or other weld defects
Technical details regarding backing weld shall be availed from AWS D 1.1
 
 
Regards
R.Venkataraman

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Date: Sat, 28 Feb 2009 10:56:43 +0400
Subject: [MW:1663] Buttering on Plate
From: pkhormis@gmail.com
To: materials-welding@googlegroups.com

Dear All!!!

 

We are doing some Tanks as per API 650. In one of that tank ,we faced a problem like shortened the lingth of plate..and JOINT GAP became more than the required 'Root gap'. Almost   "55mm" we got .So we thought about 'Buttering'. But in API 650 not mentioned any thing about 'buttering'. So which standard we have to follow for it, and what are the test we have to conduct over there.

 

There was no PWHT as per WPS,Pre heat was only upto 40 ^0 C.

 

plate thickness is 23.4mm- 'Double 'v' groove' , ASTM 573.GR 70.

--
PRADEEP KUMAR HORMIS

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