Root Gap and Root Face range for AWS Welding

[WeldWork]

Hi all,

I just want a clarification for AWS D1.1 CJP welding. If I callout CJP Double bevel with Backgouge (TC-U5-GF) in design drawing for a T-Joint. The weld detail says the Root Face and Root Gap range from 0 to 1/8" for 45° groove angle.

My question is that can Root face and Root gap numbers be different or they need to be same for this CJP weld?

For Example, Can I call out weld with 1/8" Root face with 0" Root Gap or Vice Versa? OR they both have to be same like 0" and 0" or 1/8" and 1/8"?

Does this apply to all similar weld which gives the Range for Root Face and Root Gap?

Thank you

 

[MotorCity]

Assuming you quoted the requirement correctly, my interpretation is the same as yours: both can vary between the limits stated but do not necessarily need to be the same.

That said, why not just call for a CJP and let the fabricator pick the process?

 

[r6155]

Be careful with distortions.

Regards

 

[WeldWork]

Thank you for the reply. I normally call out the CJP weld in Tail but this client wants to know weld detail also. This also helps to answer my confusion about how the root face and gap works if you have range.

Have a good day.

 

[kingnero]

Do you also spec the welding process?
Root gap and land values depend on the process.

 

[WeldWork]

The client told us they use GMAW process so we are calling out the weld based on GMAW as per the book.

 

[kingnero]

Weird. If they use GMAW, they should be able to figure those details out on themselves.

 

[dauwerda]

My question is that can Root face and Root gap numbers be different or they need to be same for this CJP weld?

Yes, they can be different.

Does this apply to all similar weld which gives the Range for Root Face and Root Gap?

Yes, this applies to all similar welds.

 

[WeldWork]

Kingnero, I think it the management that wants the more weld info on the drawings and not the welder/fabricator who is going to work on assembly. I am sure the shop floor would have made the part as long as we called out CJP.

Thank you dauwerda for the answer.