One other tip to maximise heat transfer in to the parts to be joined: If you need to clamp the 2 pieces together using metal/steel clamps, then try to insert a ceramic tile or piece of cement sheet between the clamp and the parts to be joined as this will reduce heat transfer in to the clamps and thereby maintain or help elevate part/joint temperature and give you an easier job of it.
This applies equally to any steel/metal table you may be working on.
Best
JA
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