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Hi, Robert. You have to pump heat into the solder joint faster than it can be drawn away. That means wattage.
For things like this, I'll usually use a Weller 8200 dual temp pistol grip solder gun (100/140W). Try to put most of the heat into the copper bar -- delamination of the PCB is your biggest problem here. The solder joint will remain hot a lot longer than a standard solder joint.
If you need one quickly, they're available at nearly all hardware stores as well as standard electronics equipment outlets.
Good luck Chris