Outside corner joints can be specified to be built up beyond the typical fillet weld. In other words, the designer can have the outside fillet weld built up and then ground to form a 90 degree corner if that is what is needed for aesthetics or for other reasons. The maximum convexity is usually the limit for inside corner joints.

If you are welding armour, wouldn't you be welding per Ground Combat Vehicles 12479550? Don't they have specific requirements with regards to joint details and acceptance criteria that differ from D1.1?

This is similar to a post a couple of weeks ago regarding a CJP fillet weld. A fillet weld is required to have fusion to the root, but not beyond. In so many words, you would have to have the two plates intersecting such that the inside edges would just barely touch if there is any hope of having CJP. That configuration would be an invitation to problems with fit up and burn through. A silly mistake made by designers that have a difficult time distinguishing their buttocks from a gopher hole.

Perhaps a sketch of the joint configuration and the required joint penetration would be more appropriate than a double fillet weld symbol with “CJP” in the tail.  The sketch may not be to scale or it might not be exactly what you had in mind, but it never the less clearly depicts what the welding requirements are. There is no need to guess what the designer had in mind.

Best regards – Al

I had posted this question way back and now revisiting it for an update and to ask for more of your knowledge. Tyrone the first part was I was trying to apply to an existing print as are these next topics.
I have what i believe is the correct answer but the welding engineer has different ideas. Can you measure undercut on a corner joint? AWS defines undercut as a groove at the toe of the weld meted away and not replaced. any base metal whether it affects fit form or function is still undercut correct? here again these are question referring to 12479550 ground combat code, which is real close to D1.1 which is why i posted here. Secondly is the underrun rule( undersize filet welds) If the print states a 6 mm filet . the weld can be 15%  less  as long as it does not exceed 10% of the weld length? our weld engineer says that doesn't apply. He states the only applies for welds with no size. how can you undersize a weld with no size? Is there a possibility  i have lost my mind and any common sense. When its black and white and the print states to be built IAW with 12479550,how can i be wrong? what gives? this is partly a rant but i always consider the possibility i am wrong when someone with a weld engineer degree disagrees. I am a CWI with 18 years of steam fitting/pipe welding experence  behind me.