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Michael, I've taught myself to weld sizings. Whether or not you
get porosity in the joint seems to be in how fast you can
recognise that the joint has fused. That is, it's all in the heat
of your flame. Too oxidizing (too hot) and you boil the metal and
pump Oxygen into the joint. Too reducing and you take too long to
fuse increasing fire scale and maybe heating too large an area
and slumping the weld. United's #57 Sterling also works with this
technique. Try it, You'll like it. ( After a little practice)
Chuck Hunner, waxman
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