Oxyacetylene welding nozzle getting hot. Why?

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I have made a recent return to oxyacetylene welding after about 25 years away from things. Back in school I remember my instructor holding a lit and adjusted oxyacetylene torch by the end of the tip, grasping it right next to the flame.  His point was that if the torch was adjusted properly, the tip nozzle won't get hot.  My problem is that after a few minutes with the torch lit and adjusted it starts getting too hot to touch.  Do I need to adjust more fuel into the mixture to keep the flame pushed out and away from the end of the tip?  Thanks.
Reply:Could be too low a gas flow, like you say.The tip shouldn't get too hot on its own, but it can get heat that's reflected from your work.
Reply:If you have been welding with it, its going to get hot simply because of the radiant heat from the weld pool.Have we all gone mad?
Reply:The most common cause is low flow of fuel gas.  Set your regulator pressures correctly for the tip in use.  After lighting the torch and adjusting the flame, check the pressures agian. If you have a big drop (depending on the tip been used you will see a small drop in fuel gas pressure ususally no more than 1 psi), you do not have enough flow to the tip.Hope this helps.OAdoctorwww.regulatortorchrepair.com
Reply:Hello ashley1284, to add just a bit to what others have already said, the burn rate of acetylene has to be compensated for by the correct flow/pressure. If you don't have sufficient flow/pressure the burning is occuring within the tip and will heat it. If it is correctly supplied the burning will take place just beyond the end of the tip and the tip will stay relatively cool. Best regards, Allanaevald
Reply:Okay.  Thanks for the comments.  I am using a size 0 tip, welding flat/right-angle joints on 16-gausge and 18-gauge sheet metal.  Nozzle pressures are set at 5psi/5psi (oxy/acet).  I'm guessing from your responses that maybe I need to up the acetylene on the torch handle.  Thinking back on my old welding instructor's demonstration, he wasn't holding that torch tip for very long after a cold start.  Guess I should expect some heat.  But I have noticed that as the tip gets hotter, I sometimes have to re-adjust the air/fuel on the torch handle because I can hear the flame getting a little louder, maybe, as it is creeping more into the end of the torch, rather than staying off the tip.Thanks again.