Magnesium Head Fin's Repair with Epoxy?

[G-T]

Hi There;
 I have a 1948 with Magnesium engine Base and cylinder head, and I've been trying to repair some holes/cracks and broken fin's using Hobart aluminum rod and acetylene/oxygen torch
and so far it really doesn't work.
Unless someone would give me advice on how to properly do it, I am now considering fabricating some new fins out of aluminum and simply gluing those to the head and then machining them
to look like the other ones, and then simply paint the whole engine when all done.
Any's advices or procedures or products would be very appreciated; Best regards

[Ricks]

The cylinder on a 1948 is cast iron. Post a picture of what you have.

[G-T]

Oh well, this explains why the Aluminum/Magnesium brazing rods aren't sticking on the head fins??
So what are the best options for those head's fins repair?
Thanks...!!

[Scooter4]

Good evening,
I have brass brazed them, nickel rod arc welded them and on areas where I cant reach I have metal epoxy glued them on, but that has to be thick enough to hold and you can see it.

There are people that tig with nickel and also mig weld them. 

The problem with brazing is so much heat is needed at one time that a lot of the cylinder is heated up that the uneven heat my be risky for for deformation or cracking. But, I have done a lot of it and am not aware of a problem.

When people tig or mig weld them, they do not preheat, they do bits at a time.

look for videos.

Good luck,
Scooter

[G-T]

Thanks for your advice; I will let you know how it will be going when I will have the time to get back working on it; Cheers...!!