Welding on lower legs

[Dukes Fit]

Just bought some weld on leg lowers and have a question that may sound stupid.

On the new leg lowers there are notches that butt up to the upper leg, what is the purpose of these?

Is it for weld penetration? Normally I’d weld a Double Vee butt weld for this kind of thing but just wondered if there’s something I’m missing.

Here a picture from the parts book, you can see the pattern on top.

What have others done?

 

[Shutesy]

Just bought some weld on leg lowers and have a question that may sound stupid.

On the new leg lowers there are notches that butt up to the upper leg, what is the purpose of these?

Is it for weld penetration? Normally I’d weld a Double Vee butt weld for this kind of thing but just wondered if there’s something I’m missing.

Here a picture from the parts book, you can see the pattern on top.

What have others done?

No idea what the notches are for but I just ground half the 'V' on the top part of the leg and welded the whole way along the join on both sides as a butt joint, never had one fall off. Tacked it quite well both sides first to stop it distorting caused by welding one side fully first and then it not being straight.

 

[Dukes Fit]

One genuine, one pattern.

Both got notches, seems an oddity to me

 

[fiatf130]

The way it looks you would think it was meant to slot into a corresponding pattern on the top section of leg but I know this isn't the case so it's rather strange. They would be better coming weld prepped to a v ready for welding on.