Posted by JOB on August 15, 2012 at 18:36:34 from (74.36.131.224):
In Reply to: acetelyne torch posted by crispy cremer on August 14, 2012 at 20:22:47:
I was told 5 Acetylene and 20 oxygen. From many years of experience 7 acetylene and 40 oxygen works the best for me. If your torch has two oxygen valves on the handle you should open the one closest to the regulator wide open, and use the valve closest to the tip to adjust your flame.
You should not empty an acetylene cylinder in less than 7 hours. If you do acetone will be in your acetylene. Acetylene tanks are filled in 7 hours also, unless the process has changed.
A tip will only handle so much pressure. To see how much pressure your tip will handle set your acetylene at 3 pounds, set your oxygen at 3 pounds. Light your torch, open your acetylene valve all the way. You should have a very sooty flame, increase acetylene pressure slowly, your flame should be connected to the tip. When the flame leaves the tip you have too much pressure, decrease pressure a tad. Adjust acetylene valve so flame is connected to end of tip. Now open your oxygen valve on the torch all the way, increase pressure until you get a neutral flame. That is all the oxygen pressure you need to run that tip. The above information is for gas welding and brazing, and welding tips in general.
If you starve a tip for acetylene it will pop out. If you have too much pressure on your lines your are using the valves on your torch handle for regulators.
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