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Cutting torch skill

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john_t

04-19-2001 05:31:06




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I'm trying to improve my skill with my cutting torch. Is there a website that describes the basics of this operation? My problem is that as i cut, the metal fuses back together.... Very frustrating. Thanks.




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Big Mike

04-20-2001 18:14:25




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 Re: cutting torch skill in reply to john_t, 04-19-2001 05:31:06  
Go to your welding supply house and ask for a cutting tip selection chart,the one i have is made for victor torches but should apply to all others,setting the pre heat down will help,another thing is to set the oxy pressure according to tip size, 40 psi and a #2 tip will cut 1" plate 1/8" use no more than 20 psi,pratice,pratice. if you cant get the results you want adjust the oxy pressure and try some more. the benefit to fine tuning the cutting torch is that it reduces the amount of grinding to be done. good luck

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Butch

04-20-2001 11:43:33




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 Re: cutting torch skill in reply to john_t, 04-19-2001 05:31:06  
John, You are either moving too slow or have too much pre-heat. A commom misconception about cutting torches is that the pre-heat flame melts the steel and the oxygen from the center hole blows the molten metal out, so people turn the pre-heat way up thinking it will improve the cutting action and they get the work piece so hot that it flows back together. The cutting action is from the the oxygen flow burning the steel out of it's path and the pre-heat only gets the metal hot enough to start burning. If you develope a steady hand and clean the steel before cutting, very little pre-heat flame is required and you will get sharp cuts as long as you keep the tip clean and learn the correct travel speed. With the tips nornally supplied with torch kits it is hard to cut metal thinner than 1/8" with out running into the problems you discribe. Turn the preheat flame down, clean your tips and work, learn the correct speed by trials on scrap and you will be cutting nicely in short order.

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bil b va

04-20-2001 07:04:14




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 Re: cutting torch skill in reply to john_t, 04-19-2001 05:31:06  

i suspect you are not fully opening the oxygen valve during the cutting . i had this problem while showing my brother how to cut . as you start to cut push the oxygen lever all the way down and angle the torch tip slightly forward . on thin metal more angle . you must have enough oxygen pressure to blow the molten metal away .as someone else said practice on scrap metal until you get the hang of it . bill b va.

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wrenchman

04-20-2001 01:16:23




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 Re: cutting torch skill in reply to john_t, 04-19-2001 05:31:06  
either you are cutting too slow or your tip is too small.speed up and see what happens.practice,practice,practice,use soapstone and lay out lines on your material and practice following them.relax,your not building space shuttles here,the worst you can do is waste a little steel. practice on scrap,its much cheaper.



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Nathan(GA)

04-19-2001 07:15:29




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 Re: cutting torch skill in reply to john_t, 04-19-2001 05:31:06  
Don't know of a site. Just a few pointers. You need a clean tip, especially the center hole. Your flame may be too hot(big). You may want to speed up a little. Set your acetylene gauge around 6-8, but never over 15 and oxygen 30-40 depending on your taste, metal thickness and tip size.



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