250-500cc Subframe welding

Ok dumb question but since it's aluminum I assume some local welder could helio arc it? I got some serious cracks started where the tabs are that the muffler bolt on to. Just a matter of time now. All from one simple falling over. So wanted to strengthen them before it's too late. Suggestions?
I looked for parting out bikes but they are just about impossible to find and didn't want to get depressed by a new parts quote from dealer.

tig weld or even a skilled mig would do the trick. ive had guys at work tig some alum repair for me that looked and held up up great. of course these things should never be welded as it messes up the heat treat but what are you gonna do? alot of our alum is mig welded at work, only our toolboxes are tigged as they are thinner metal and the tig gets it done without warping. im far from an expert but they have fixed alot of stuff for me so a shop should be able to fix it no problem for you. i will say the tig does look a bit better.