Maxwell wrote:
"Michael Horowitz" wrote in message
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We know general instructions for chosing a tip, setting pressures,
lighting the torch and setting the Acetylene so that the flame is just
about to leave the tip. Then we add O2 until we get a flame with just
a little feather. Written instruction seems to stop there.

However, we know one can adjust the torch for a larger or smaller
neutral flame, so each tip has a range of useful flame sizes.
At the low end the torch makes no noise; one opens the torch and you
go thru a hissing sound, to the roar of a jet engine.

No one seems to discuss how to determine the upper end of this range.

Can someone discuss how to determine the upper range of a given tip
size? - Mike


One consideration is gas velocity.

Operating tips in their upper range can help disperse the weld, and
especially brazing puddle. Sometimes this is desired, sometimes it's not.


Yep, that's the way I see it too.
If you want more heat you turn up the gases. When the tip exit speed is
greater than the flame speed, you're done.

Brian W