Brazing fender brackets

Finaly got round to cutting the fender horns off the back of my softail so I can mount a new fender closer to the tyre, attached directly to the swing arm. Problem is that the back of the swing arm is a casting, which in my limited knowledge, meams I can't weld anything to it. So I guess that means I have to braze the mounts on there.
Can anyone tell me what sort of torch I need to use? The plumbing torches don't seem hot enough for mild steel.

Cheers

Irish,its steel it can be welded look at the tubes to the cast steering head they are welded,I'm thinking that when woody gets onto to my hard tail we might silfos the tubes to the dropouts maybe as this would look like the way they did in the old days.

Cheers Doug. I've only really looked at old frames and like you said, they are brazed with silver. I'll have a crack at welding the brackets at the weekend.

Yea where the tube joins the casting would have been brazed back in the day,bicycle frames had all the lugs brazed makes for a nice looking frame

Brazings for people that can't Tig weld
I never liked the look of it there's no definition in the welds ..
Just look like someone took a big ol poop on that joint
Just my opinion of cause...

You've seen my welds. Poop looks better

haha That's what they made grinders for Jon.
Anywho like Doug said you can weld to those axel plates
that's what holds them together from the factory.
If I was you Id angle the bottom of the fender strut forward so as
to match the rake on your forks. If ya know what I mean..

I have to patch some big holes in the fender first and then I'll get on to the struts. Got bored with it yesterday and started swapping gear boxes on a couple of other bikes. Decided that the Shovel needed a 4spd. Its good to get back into tearing things apart again