Patch Shape

[Heavy Hand]

Hi,

I've got a non-structral wheel arch liner from my 1933 Singer Saloon I'm restoring. I want to keep as much as possible of the original metal, so I want to use my lovely new tig and plasma cutter to butt weld patches in place of the localised lacey bits, some in the middle of the panel which is approx .75mm thick.

Question!....assuming i can make any shape patch using templates, which would be best. I've seen in a book that a circular patch will provide uniform stress and hench less distortion.....but what does the hive mind think??

 

[pedrobedro]

Any shape just round the corners off so they are not sharp if that is an option.

 

[Heavy Hand]

I guess the questions I was poorly asking is....

Is there a benefit to using a circular shape (or similar) as I would guess that the stress would be evenly distributed around the perimeter over a retangular patch, where I would think there is a bunch of stresses at the corners?

 

[500e]

You say non structural so no worry, as Pedro says sharp corner removal may help but if you weld all round ??

 

[rikrobson]

if you are welding all around then I see no benefit in a curve as to an angle and the line of abutments will be welded over.

 

[zeppelin builder]

the best one is the easiest shape good ol car the singer ohc isnt it i worked on an HRG its singer ohc powered