PWHT of SA 387 CL. 11 Plate
PWHT of SA 387 CL. 11 Plate
(OP)
Good morning,
We have some structural plate to weld in the back pass of the boiler ( economizer ) that supports the economizer itself. It has broken free and we are going to band-aid it until a more permanent fix can be administered at a later date.
We are going to be welding vertical plates ( SA 387 CL. 11 ) down to the top flange of a plate girder ( of the same material ). Both members are around 1 1/2" / 1 3/4" thickness. I could not find SA 387 in D1.1 to see what material number (P#) it was classified under for PWHT/PreHeat requirements. However, in ASME IX, SA 387 is listed as a pressure vessel plate and is a P#4. All of our welding procedures are qualified to ASME IX but in my mind this is a structural weld.
My question is - Should we weld this with our ASME IX procedure for P4 material and then heat treat it in the same manner as a P4 material ? Or would it not need PWHT'd because it is a structural weld and not a pressure vessel ( boiler proper ) ? Or is there any way we can get out of PWHT all together ( this is what we are hoping to do so the unit can be brought back online quickly )
Thank you for your time
We have some structural plate to weld in the back pass of the boiler ( economizer ) that supports the economizer itself. It has broken free and we are going to band-aid it until a more permanent fix can be administered at a later date.
We are going to be welding vertical plates ( SA 387 CL. 11 ) down to the top flange of a plate girder ( of the same material ). Both members are around 1 1/2" / 1 3/4" thickness. I could not find SA 387 in D1.1 to see what material number (P#) it was classified under for PWHT/PreHeat requirements. However, in ASME IX, SA 387 is listed as a pressure vessel plate and is a P#4. All of our welding procedures are qualified to ASME IX but in my mind this is a structural weld.
My question is - Should we weld this with our ASME IX procedure for P4 material and then heat treat it in the same manner as a P4 material ? Or would it not need PWHT'd because it is a structural weld and not a pressure vessel ( boiler proper ) ? Or is there any way we can get out of PWHT all together ( this is what we are hoping to do so the unit can be brought back online quickly )
Thank you for your time





RE: PWHT of SA 387 CL. 11 Plate
RE: PWHT of SA 387 CL. 11 Plate
RE: PWHT of SA 387 CL. 11 Plate
Yes it is 'structural' in nature, but since it requires PWHT to be safe to use, neither AISC nor D1.1 will recognize it.
RE: PWHT of SA 387 CL. 11 Plate
RE: PWHT of SA 387 CL. 11 Plate
RE: PWHT of SA 387 CL. 11 Plate
I have never personally qualified a welding procedure but I am reading up about temper bead procedure's and it looks like it is very involved with hardness testing and macroetching. I don't see electrode diameter being an essential variable though ?
RE: PWHT of SA 387 CL. 11 Plate