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Wood's metal (Cerrosafe / Cerrobend etc) is another VERY effective way. It's an alloy of lead with a LOW melting pint (under 80° C by memory). You need just enough to fill the bend area and into the straight area again. Melt it, pour it in (bunging one end), let it solidify a little (but not completely cool, as it shrinks when cold - hence easy removal in most applications). Bend pipe. Heat again, pour it out.
DAF used to employ this technique for bending all the tubes in Beaufort airframe production in ww2 - gives an EXACT bend. They used to melt it merely in boiling water - no need for flames to vapourise the already poisonous lead and cadmium vapours.
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