John,

the hottest part of the flame of the standard burner types is at the tip of the blue part of the flame. The cyclone burners are really good for working on round parts as the flame wraps around round parts to surround the area with flame which is hottest at the surface of the round component.

You get a feel for things as you gain experience. If you are trying to braze anything that has a large mass give it plenty of time to heat up and try to conduct your brazing/Silver soldering out of any wind or draughts. It is surprising just how much heat can be lost due to wind.

Bob.

Hi John,

If you can't see the flame, view it against a dark background.

A cyclone flame still produces a blue zone and the hottest part of the flame is at the tip of that blue zone. The whirlwind type gas flow produced in this type of burner creates a blue area that is circular in nature.

Keith