www.ultimatehandyman.co.uk

Helping my son sort his car renewing a rear subframe.
Some of the suspension and driveshaft bolts are tight and corroded. Despite using Release oil soaking over a few days, they will not budge and one sheared using a plumbers torch to heat the area around the threads and apply release oil as cooling to draw the release oil.
Previously I would have access to a welding torch for problems as this applying greater heat and more confined to the area of the bolt/threads etc. to break the corrosion.

Is there a Propane gas torch that can offer near the same as a gas welding torch.

I had this issue on my tractor and there were a couple of pins rust frozen in. I tried a conventional hand blow torch but it was useless. A pal came around with a bottle gas and torch, basically a bigger version of my blowtorch. The thing is it lay so much heat on that the pins went cherry and tapped out with ease.

DWD

Thats what I did previously with a proper torch, but now I dont have access.

Most likely if any of these propane torches dont offer similar, will have to find a mobile man with the proper model

If you can get a grinder in the space, cut the thing off/out whatever. I've totally given up on trying to release rusted bolts and where the opportunity exists I cut and replace.

When you say release oil, the best I have used for over 50 years is PlusGas, the spray can is easiest to use with supplied tube; soak for 30 minutes.
Unfortunately when galvanic corrosion occurs it is almost forms a weld between metals.