Socket Fillet Weld

[Cor123]

Just a quick question regarding fillet welds. We are observing low fillet weld throat (2.0 mm) on a 0.75" offtake pipe with 5.56 mm nominal wall thickness. Design Pressure is 28 barg and 3 mm CA.
I calculated the theoretical weld throat using B31.3 The calculated theoretical weld throat is 4.29 mm. We also calculated the shear stress which is 453.09 psi.
This shear stress is below the 0.8 X allowable stress = 16000 psi which means that the fillet weld should be ok for pressure containment.
My question is there any critical threshold (from standard or good practice ) below which fillet weld would need to be reinforced /repaired although it passes the shear stress calculation. I believe that although the the calculations for shear stress says ok, the weld throat thickness is too low. Also risk of loosing more material when doing surface prepation.
Thanks for your help.

 

[EngrRodri]

4.29 mm weld throat is too much for 5.56 mm nominal wall thickness.... please consider that it is fillet weld... thus 4.29 mm is impossible to achieved.
as experienced .. please make 3 pass for welding of fillet.... the weld throat for that is sufficient to withstand that pressure..
remember in fillet weld.. more throat thickness will make more stress.

 

[weldstan]

Hog wash. The run pipe is 5.56 mm. The shoulder of the socket is considerably thicker. It is no problem meeting the 4.29 mm throat size.

 

[racookpe1978]

This question has already been asked in the Piping Forum.