As per API 650 clause 5.2.3.1 it is very much clear that plates to be joined by butt welding shall be matched accurately and retained in position during welding operation.
Also nowhere it is indicated about buttering or any other means to adjust such dimensional deviation which is beyond qualified WPS.
Only alternative is to replace shell plate /add one more such shell plate which will not violate Tee joint distance as per code.
Bharat B. Gole
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.
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