Saturday, March 19, 2011

[MW:10434] process thk -AWS

Dear Mr.Karthikeyan,

 

Please give me your opinion for the following.

 

Recently we have qualified one PQR with

 

SMAW – Root and HOT pass.

FCAW –  Fill and Cap.

Base Metal thickness: 25.4mm / 10” Pipe Dia

Code : AWS D1.1,2010.

SAES-W-013.

 

Since SAES-W-013 Clause 5.4.2 is confirming that FCAW process shall not be used for Root and we have followed the same condition during the PQR qualification.

 

 

Our interpretations are as follows:

 

1.       As per the AWS D1.1, Table 4.2 - If we use the plate thickness of 25mm over, qualification range will be 10mm to unlimited.

2.       I have stated in the WPS that SMAW process is only for root and hot pass and FCAW for FILL &CAP.

3.       Based on the SAES-W-013 and AWS Table 4.2, the QUALFICATION range for the WPS is 10mm to unlimited or 0.5 to 1.5 of base metal thickness.

4.       For the combination of Welding Process ( SMAW+FCAW), The thickness limitations will not be applicable for each process since root and Hot Pass of SMAW is not for FILL & CAP

5.       SMAW WELD METAL is backing for FCAW.

6.       We always use the WPS as SMAW –ROOT /HOT Pass & FCAW – FILL&CAP.

 

Clarification required:

 

1.       For the combination of welding process, the thickness limitation will not be for each process.

2.       Base metal Qualification range will be considered for both the process. ( as below).

 

 

 

With Kind regards,

 

S.Elumalai.

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