Figure 127.4.8-4 (a) shows a full penetration weld between nozzle (branch) and shell (header) - set on.
Figure 127.4.8-4 (b) shows a second detail - but insert style.
My interpretation has always been that the external fillet weld has to be 3/8" minimum to achieve a minimum 1/4" throat.
In 127.4.8-4 (a) this appears to be correct.
I notice that the second detail has an unequal leg fillet on the exterior, with a minimum t_c throat value dimension running perpendicular to the shell bevel.
It appears to be right angle to the weld bevel.
If so - for a 45° bevel, whatever the thickness, the leg would only need to be 0.31" on the vertical leg if parallel.
Reducing the bevel to 30° would actually REDUCE the required vertical weld leg dimension.
A. Is this correct, and I have been requiring more welding than required for insert details?
B. Is this incorrect?
Figure 127.4.8-4 (b) shows a second detail - but insert style.
My interpretation has always been that the external fillet weld has to be 3/8" minimum to achieve a minimum 1/4" throat.
In 127.4.8-4 (a) this appears to be correct.
I notice that the second detail has an unequal leg fillet on the exterior, with a minimum t_c throat value dimension running perpendicular to the shell bevel.
It appears to be right angle to the weld bevel.
If so - for a 45° bevel, whatever the thickness, the leg would only need to be 0.31" on the vertical leg if parallel.
Reducing the bevel to 30° would actually REDUCE the required vertical weld leg dimension.
A. Is this correct, and I have been requiring more welding than required for insert details?
B. Is this incorrect?
