When you hit the handle, adjust it so teh flame stays blue, but doesn't change shape/color very much. When you hit the handle, you dont want a significant change in teh flame. This way you blow out the metal, rather than altering the heat and flame characteristics every time you pull the O2 on. Also make sure to aim the tip in the direction your going to preheat the metal. Makes a smoother, faster cut then going straight up and down. I have found a 15degree angle works well, as much as 30 or even 40 in some instances will work nicely.
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