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    Welding does ruin the heat treating, if done improperly. But 30-40 years ago manufacturers developed the technique of welding very rapidly, to minimize the damage. Cannondale invented the technique, first to put together aluminum frames, but it was adapted to steel.
    – Daniel R Hicks
    Commented May 1, 2020 at 0:58
  • 6
    Brazing, on the other hand, does not use temps high enough to damage the steel tubing, unless badly botched. This is why brazed "lugs" were used to fasten together better-quality bike frames prior to the invention of rapid welding.
    – Daniel R Hicks
    Commented May 1, 2020 at 1:01
  • In GCN's video about Agustin Hincape, it showed him using what looks like an oxy-acetylene torch to fillet braze. The tubes looked like they were getting red hot. Is fillet brazing impossible with heat treated tubes?
    – justin
    Commented May 1, 2020 at 2:39
  • @justin: it's possible, but its challenging. The difference in time for getting the joint hot enough to wet the metal and hot enough to "overcook" it is pretty slim.
    – whatsisname
    Commented May 1, 2020 at 2:53
  • So basically you have to be god-tier frame builder lol.
    – justin
    Commented May 1, 2020 at 2:59