If a welder is not available, here's a few more tips that might help.

• If the head is not stripped out, use a blow torch and heat up the Torx bolt head until it's smoking hot.  Don't burn anything around the bolt. First look under the vehicles or on the backside of the bolt and avoid heating wires, fuel lines or anything else that's flammable.  Use a heat shield if necessary.  Paint will burn too.  Then after heating it up, try backing it out.  Heat causes metal to expand and can break the hold rust has on the bolt threads.  Sometimes an application of regular candle wax onto the hot threads can help.
     
• If the head is stripped out, try using an angle grinder to cut the opposing sides of the Torx head so they are flat and parallel, like opposite sides of a bolt head.  Then grab the biggest set of vice grips you can find in your toolbox, clamp down on the torx bolt head and try to back it it off.  Again applying heat can help greatly as well as wax on the threads.
     
• Try PB Penetrating Catalyst, found at your local Auto Supply store.  This is not like your average penetrating oil (such as Liquid Wrench).  PB does a much better job of penetrating and breaking rust.  If it smells like Moth Balls, that's PB.  I've also applied heat after letting PB soak for a while.
     
• Last ditch effort, drill the sombich clean out and use a real bolt like a grade 8 bolt with a nut and lock washer on the back side.

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