Dimensional tolerances of weld joints
Dimensional tolerances of weld joints
(OP)
I have specifications that require welder testing to ASME sect.IX and welding by API 650. On this job, a 1/16" root opening for a fillet weld is called out but our trial fit is showing an average of 3/16" root opening. Not being as familiar with API 650 as AWS D1.6, I am questioning where joint dimension tolerances are addressed. I have been informed that it will refer you back to D1.6 but I have not found that statement either.
Thank you.
Thank you.





RE: Dimensional tolerances of weld joints
RE: Dimensional tolerances of weld joints
Thank you for your assistance.
RE: Dimensional tolerances of weld joints
RE: Dimensional tolerances of weld joints
Where does the 1/16" root opening for fillet welds come from ?
The idea of a fillet weld is to have 0 root gap - codes usually stipulate a maximum root opening for the reasons given by weldstan.
Cheers,
DD
RE: Dimensional tolerances of weld joints
Best regards - Al
RE: Dimensional tolerances of weld joints
No problem with that - my comment was based on this statement - " On this job, a 1/16" root opening for a fillet weld is called out".
Why would you call for a root opening on a fillet weld ?
I realise socket welds have a gap to allow for weld expansion but structural fillet welds are normally clamped together prior to welding.
Cheers,
DD
RE: Dimensional tolerances of weld joints
Best regards - Al
RE: Dimensional tolerances of weld joints
This is a door to a vessel. The re-pad going around the neck, left side and right side with FW in center, calls for 1/16" gap with a 3/8" fillet FW. Basically, the ID of the re-pad is 1/8 larger than the OD of the door neck. Rolling and breaking 1-1/4" 317L and 3/4" 317L made hitting this on the mark very difficult.
I do like the idea behind GTAW's use of a 1/16" gap on multipass fillets.