welding cast aluminum

[burt]

ok here goes, i need to weld up a crack in the block of my 4-wheeler engine and it's made of cast aluminum.

I have access to a nice miller TIG unit at school, and i have welded regular aluminum but i have never attempted to weld on cast. I do have an old lawnmower engine block also made of cast aluminum to practice on.

So i guess i was wondering if any of you guys have experience doing this kind of thing and maybe some tips to get it right

[burt]

No body's tried anything like this? might have to find someone to do it for me

[SlvrdoHDmax]

Clean, clean, and clean it some more. Make sure to grind out the crack. This video has some good info in it


http://www.youtube.com/watch?v=p62Cyqe714Q&feature=plcp&context=C396fd1cUDOEgsToPDskIVlDAvPskrzMQ0EFHtHXOW

[Srabai47]

Watch that video above me. The whole thing. Welding cast aluminum is black and white from regular aluminum. Its gonna spit and **** all over the place. dont worry if it looks bad because it will. just gently grind her down when your done.

[burt]

SlvrdoHDmax can you post a link to the video it's not working for me

[SlvrdoHDmax]

http://www.youtube.com/watch?feature=player_embedded&v=p62Cyqe714Q

[Minimeh93]

50% of what i weld at work is cast aluminum, Most of the time it runs good since it is new, but when you hit a dirty spot.... OH LAWD

[idriveafastcar]

i have welded using aluminum tig and i had to do a dirty aluminum helix that got ground down bad and it came out good. just caked on the aluminum and ground to the the deg. i needed. as long as it gets bonded who cares what it looks like, rite. you can use a grinder or shaving tools to make it look pretty as long as you fill it with enough material.

[burt]

thanks for posting that video it sound like it will help. hopefully i can find some time to weld it now