Half-pipe jacket weld - Can this be considered a full-penetration fillet weld?

[41Alberto]

We are building an ASME vessel with half-pipe jacket for cooling. Since it is a cyclic design, the weld between the jacket (4 mm thk) and the shell (16 mm thk) must be a full penetration weld. According to ASME code, can the weld shown below be considered a full-penetration fillet weld?

Vessel manufacturer arguments:
- Basically the ASME-Code requires a minimum attachment of the thinnest wallthicknes (either jacket or shell) – which is 4 mm in our case
- For cyclic load ASME code recommends (but it is a recommendation) to attach the coil completely. This does NOT MEAN having a full penetration weld of 4 mm, plus a fillet weld of 6,46 mm on the outside!

This is my understanding of a full-pen fillet weld:

Your comments are very much appreciated!

 

[r6155]

The fillet weld attaching the half‐pipe jacket to the vessel shall have a throat thickness not less than the smaller
of the jacket or shell thickness.
Through thickness jacket welds with a fillet shall be considered when the jacket is in cyclic service.

See ASME VIII Div. 1 2023

Regards

 

[41Alberto]

Thank you for your comments r6155.

In this case the smaller thickness is the jacket thickness at 4mm. Would you say that the weld shown in the picture above satisfies the code statement you are citing?

 

[r6155]

The macro etch picture is full penetration weld, but the gap is exaggerated.

Regards

 

[41Alberto]

Thank you r6155!