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I have a nice welder, inherited from my father. The bolts seem plain steel, not stainless. It's a cheap Chinese bike - no cost-cutting spared on it.
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Gotcha, so you won't be out a lot whatever method you try.
Along with Antimatter and Dark Matter they've discovered the existence of Doesn't Matter which appears to have no effect on the universe whatsoever!
Rich Tennant 5th Wave
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I know you've solved the bolt problem by now, Brady, but for future reference, aluminum and most stainless steels are non-magnetic, which yields a quick and dirty test before you weld.
Will Rogers never met me.
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Thanks. I'm quite a good mechanic, and can normally tell metals etc. but this could always come in handy.
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I'm speaking at a level of knowledge of someone who thought an arc welder was something Noah used, so treat appropriately.
trying to weld to the end of a bolt that is recessed sounds to me like a recipe for disaster - one slip and you're making the bolt even more permanent!
Also, isn't heating the bolt going to expend it and, again, likely fix it more firmly in place?
If it is at all possible (I have no concept of the sizes involved here) I'd try cooling the whole thing down. If you can get that metal to shrink, it may free the bolt enough to be able to get it to move; not particularly practical if it's still attached to the bike, though 
You could also try heating it. If you can heat the bolt without heating the surrounds too much, it will expand and push against the corrosion that I imagine is keeping it stuck. When it cools again it may be free enough to shift.
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It's a tiny bolt recessed into an aluminium pressure plate. I will try to not touch the aluminum plate, and will risk no mask for this quick weld. But I like your idea of heating and cooling the bolt. That still leaves its head a bit rounded though.
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Sounds like the saga I had earlier this year when I had a recessed locking wheel nut siezed on my car.
We condsidered the welding option, but high risk of damage to the wheels as they were special coated. In the end my pal used a tungsten carbide hole saw to core out the head of the bolt (took 4 hours) to allow the wheel to get off to then allow enough room to get in with something to grab the stud. To alleviate a risk of damage from welding splatter it is possible to use a soda can cut into a thin strip and sprung into the hole to act as a barrier.
You might consider hamering in an allen socket into a hole drilled into the rounded bolt. depending on the recess/bolt head ratio, the hammering on a socket could be an option (but doesn't sound like it).
The other option is a shallow multi splined socket extractor, like these here[^]. Don't need as deep a hole as an ez-out and more teeth to bite.
There are videos on Youtube on using welding to remove siezed bolts.
Good luck, I think at least the bolt you are removing wont have been as hard as special steel alloy in the bolt I was trying to remove, it took an eternity just to drill a small 3mm hole using a brand new titanium bit!
Don't forget to drown in penetrating oil, and also go for the heating and cooling option first. get a narrrow tip flame, you can get these at the local diy shops.
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I'd love that set of hex screw extractors, after payday, Wednesday, but today I could afford only one beer one the 5km return walk to the hardware to not find a decent 8mm socket. I have already rounded two non-decent ones.
I have an easy-out that may just do the job, and will try after the heating trick.
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There's another option here:
1. Use a drill to make a bigger hole than the screw itself (drilling through the screw).
2. Use a threadformer to create a new thread.
3. Get a new and bigger bolt with a proper head.
4. Screw that bolt onto the newly formed thread.
Done.
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Drilling through steel with a 6mm bit on a hand drill isn't my idea of fun at all. It's on the bike, so I can't use the press drill.
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Probably way toooo much fun... 
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Have you tried heating it first? That seems to work for the Wheeler Dealers.
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That generally works for nuts, not bolts - it expands the metal so hot nuts get bigger and looser. Hot bolts get bigger and tighter.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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I'd go with Dave Auld's or Davex86's suggestion. Joan Murt's suggestion is good unless the bolts are attached to something spinning. There is a danger of throwing the balance out.
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Brady Kelly wrote: What advice can any experienced non welders here please give me for this
Wear goggles.
Not while goggling but during welding. 
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We've got something better![^]
Found this old Dilbert last week. Still makes me laugh
It's an OO world.
public class SanderRossel : Lazy<Person>
{
public void DoWork()
{
throw new NotSupportedException();
}
}
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"Site will be back shortly"
I assume it's the "take a week to replace our URL's with Uniform Resource Locators" one?
If so, then yes, I remember it well...
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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That's the one. Except it will take him a month 
It's weird you get to see the site will be back shortly message. I got that yesterday, but I was able to see that picture.
It's an OO world.
public class SanderRossel : Lazy<Person>
{
public void DoWork()
{
throw new NotSupportedException();
}
}
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Sander Rossel wrote: That's the one. Except it will take him a month
Well it was July 1998 - I'm allowed to forget a few details!
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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I'm seeing
"We are updating the site for you and will be back shortly. In the meantime, how about laughing at a comic or two on our sister site?"
which isn't amusing!
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Strange, I got that yesterday on the Dilbert site, but I could see that picture.
I can't find another link to that strip, so here's what it says:
Pointy haired boss: I don't see why our web pages need URLs. Get rid of them. Did that make any sense at all?
Dilbert: Yes, it's brilliant. Give me a month and I'll replace our URLs with Uniform Resource Locators.
Pointy haired boss: Perfect.
It's classic 
It's an OO world.
public class SanderRossel : Lazy<Person>
{
public void DoWork()
{
throw new NotSupportedException();
}
}
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This is a simulated quantum computer based on webGL. It's going to be much slower than an actual quantum computer as it's simulated with non-quantum hardware. Anyway, it gives you an impression of how quantum computing might be done in the near future.
http://qcplayground.withgoogle.com/#/home[^]
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I thought I had read this somewhere before, but maybe just dreamt it up............oh, no I didn't, it is just a few posts down
Sadly on our corporate desktops it doesn't work due to the browser, just like the post below is blocked. 
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Try the 'https://' version.. It worked for me..
.:>GSN<:.
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