Is this doable?

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Master cylinder for a brake off a mountain bike. Appears to be cast aluminium? Could this be done if prepped and 1/16 rod and tungsten? It does not house fluid that area was not affected.
Reply:If it's aluminum just try it and see - that's what I do Heck you already need a new one anyway - you won't break it worse Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:You gotta think about how close to the seals for the hydraulics the heat will be for one thing. Can you dismantle it enough to get all the seals away from the heated area before welding? If it breaks again going down a steep hill can you still slow down/stop? If it is not welded correctly to begin with, that is a consideration. How much does the replacement part cost? I think it is "Doable", but are you capable of "Doing It"? Will you be the one riding it after welding? You may be able to get it to hold OK for awhile, but how will it hold up in a Panic Stop situation? I am sure there are members on here that can do it right, but how are you on welding this?
Reply:Good thinking on the seals. The part was given to me. I'd sure like to give it my best shot and see. I am curious as how to ground this? I was thinking that i will already paint after welding if it seems to work. Would a third hand on a small area that was scraped off be the best for a ground?
Reply:Originally Posted by MinnesotaDaveIf it's aluminum just try it and see - that's what I do Heck you already need a new one anyway - you won't break it worse
Reply:It could be magnesium too. Looks a little like that to me. Strike an arc and see if it's green, that's one way to tell if it's magnesium. Either way you should be able to do it if you are pretty good with tig.
Reply:Is the plan to put it back in service after the fix? Maybe keep it as a spare? Or is this just to see if YOU can do it?