What you trying to do? Warm up bracket so it will expand and slide up or weld? All you can do with propane alone is soft solder.
Sort of but not quite.
Originally (before I knocked the fireplace out to restore it to its former glory) there was a gas heater and back boiler built into the fireplace. The gas heater / back boiler had an internal alluminium flue running up the chimney in place. The original idea was to re-use this flue and connect it to the new wood burner. Except, some div forgot to check that the original flue would be compatible with the wood burner. Which it transpired it wasn't (basically it would disintigrate if used with a wood burner).
So, the old flue had to come out. Brackets secured the old flue at the top of the chimney and these were left in place with the intention that the new flue would be attached to this bracket. The problem is that the new flue was connected to the brackets and dropped down the chimney before Christmas. The woodburner arrived yesterday. Whatever way the flue has been dropped (or as I suspect cut), it is marginally too short to be connected to the woodburner. The installator (who is also my brother-in-law) has suggested heating the braket at the top of the chimney and then manipulate it downwards a tad so the flue will attach to the woodburner.
Now the reason he suggested this is because it is a three storey house and when the flue went in the roof tiles were also replaced. Scaffolding was needed and cost over £400. £400 that I would prefer not to shell out for again basically. We can get at the bracket from the attic by removing a few bricks but I only want to remove as few as is possible as I don't want a few tonnes of slate, masonry and assorted shit deciding to collapse itself ! And as the only payment I'm going to give him for doing this is the equipment I buy, I would like it to be the smallest, and preferably, the least expensive as can be and capable of doing what needs to be done.
Didn't consider a weld gun but will run it past him. Basically I just want to get this woodburner in and working so I can get some semblance of normality back (without shelling out for more scaffolding obviously !).