welding electrode

[samiul haque]

Dear all,
I have 12Cr1MoVg material
1. My question is can I used E7018 electrode
2. Another one question is how I know from drawing this is the P5 or P11 or P22 or P91 Material. Please help me

 

[mk3223]

1. E7018 is typical for CS to low Cr alloy, not suitable for 12Cr material.
2. Don't assume it. May issue a RFI to Engineer for clarification.

 

[weldstan]

The drawing should have the material specified in a table on it. If you cannot find them, ask the Engineer for clarification as stated bove.

 

[GD2]

Samiul,

I will try to help your second question.

I am not sure what drawings you possess, but I will try to lead you in the right direction.

1. If the equipment was installed under a specific project, look up the project folders to find the component drawing, material certs, WPS, PQR etc.
WPS/PQR will specify the P Nos...
P-Nos are assigned in ASME BPVC Sex IX.
2. If you got the MTRs, it will give details of material standard like SA/ASTM/UNS etc., chemical composition and material properties.
3. If you still want to verify the P-Nos, go to Sec II Part D and look up the appropriate material standard under the relevant table.

GDD
Canada