tig welding tubing, fitting face perpendicular to tubing

[Spike2000]

looking for some existing fixturing or ideas on how to hold a very tight tolerance on butt welding a 4" fitting to 4" o.d. tubing with a perpendicular tolerance of .015"
we are tig welding and our current tolerance is .032" on this dimension, thank you in advance

 

[mfgenggear]

OP
Is this only one or or high volume.


Buy a tool cast plate large enough to hold assembly.
Buy soft angle plate.
Draw out the birds eye view of the layout
Obtain dimensions to assemble and weld
Assembly. Generally due to weld shrink and slight distortion it's generally best to fitup and weld inner assembly and cut and fit up flanges last. All angle flanges must be secure to the cast plate , socket head bolts or equivalent.
Mill out angle flanges with cradles to hold assembly during fitting and welding.
Drill out holes to bolt flanges when welding.
Angle flanges must be precision machined.
Faces perpendicular and square.

 

[Spike2000]

Thank you for the response, 2-3 pcs for prototype then production run quantities...100's of pcs