What does the welding detail mean in attached file ?
Weld on arrow side ? But what are circle and arch like markings adjacent to "V" ?
And what weld joint efficiency it would need E=0.9 from ASME VIII Div 1 - Table UW 12 ?
If you are welding both sides (or can confirm UW-35 requirements): E = 0.7 no RT, E = 0.85 Spot RT, E = 1.0 Full RT
If you are welding one side (not able to satisfy UW-35): E = 0.65 no RT, E = 0.8 Spot RT, E = .90 Full RT
If you are welding both sides (or can confirm UW-35 requirements): E = 0.7 no RT, E = 0.85 Spot RT, E = 1.0 Full RT
If you are welding one side (not able to satisfy UW-35): E = 0.65 no RT, E = 0.8 Spot RT, E = .90 Full RT
Thank you for your response the welding detail provided in the attached snippet (in the first post) and full RT can warrant using E=1.0?
The full RT was done on the weld ... however the weld is single V groove but having "sealing run ground" weld on the other side (as i understood from the Snickster attachment).
What is App 47 ? - Is it appendix 47 from ASME VIII div 1 - "Requirements for Pressure Vessel designers" ? But I could not find there related to my question - may be i missed something ?
So the symbol indicates a backing or back weld. Still possible this symbol is indicating melt through (welding one side only)....the symbol is usually filled in black if it is melt through, but could be an oversight.
Assuming a backing or back weld, means there is access to the back side. That makes it a type I weld. Full RT = 1.0.
There are interpretations thrown about that seem to validate using an efficiency of 1.0 for welds made from one side only with no access to the backside, if they have been fully radiographed. IMHO that interpretation is not good engineering judgement and I would not go that route.
Referencing Appendix 47 is a polite way of stating that to design pressure vessels you need some training/experience. You should find someone with both to help.
