That is okay. The welds there don't need to look good, they just need to hold. I am not a great welder but my stuff doesn't come apart.
I know that here in CA there are some muffler services that are mobile, guys that have self contained pipe benders and torches or MIG welders. Maybe you can do a search for your area to see if it is worth it versus buying a cheap Harbor freight 110 welder.
