Re: Re: Re: Re: Is Gas Welding Practical?

Posted by T_Bone on January 24, 2002 at 16:36:44 from (207.173.149.113):

In Reply to: Re: Re: Re: Is Gas Welding Practical? posted by Tim Briggs on January 24, 2002 at 13:43:46:

Hi Tim,

Congrats Tim as you have just learned a great leason, live with-in your means...foolded you huh? LOL Franz done give away my secerts :)

Now that your wanting to learn, I'll Tell you anything I know to steer you in the correct direction.

When I made the statement it doesn't matter what cylinder you have , as you'll never be close to over drawing any acetylene cylinder. Why?
Too many welders think that you need to turn up the pressure to achieve a god like weld. ha ha it was a mistake...good I ment..I'm in a very good mood today so bear with me...
The opposite is true. For my example with Branden on a 1" plate test, I would use 5psi of acetylene and 20psi oxygen with a #3 tip, just so I could have the speed to whoop him as normally I would use a #0 or a #00 tip but notice I didn't say anything about upping the gas pressure on act or oxy as it's not needed. Why?

I use two gas pressure settings for all my cutting and welding needs:
There's three gas valves located on the torch, two on the mixing chamber (the part of the torch closest to the gas supply hoses) one oxygen valve and one acetylene valve and there used for controlling preheat. The third valve is on a cutting chamber is up forward of the other two valves is for setting th oxygen mix of the preheat flame. If you had a welding/brazing tip on the torch, just the two valves on the mixing chamber would be used and if the cutting head is attached then the oxygen valve on the mixing chamber is set too wide open and the oxygen is controlled by the most forward oxygen valve and sets the preheat for cutting.

CUTTING:
1) I use a #3 cutting tip with pressure set at Oxygen 40psi and 7psi acetylene. Don't matter if I'm cutting 24ga or 1" plate I use the same tip and pressure settings. How about them dingle berries on the back side of the cut?
I don't have any when I'm done if I done my homework!!! Why?
Damn given-up more trade secerets but hey I have nothing better to do. I told you thats I was in a good mood :)
What causes the dingle berries? A very CLEAN center hole in the cutting tip along with the correct speed controls the dingle berries! PERiOD!!! Reread this as thats the seceret to cutting very well without slag on the back side!
On a cutting tip you have two types of mixed gas discharge holes. The outside gas holes are for base metal preheat and a center blow hole for discharging the base metal you just preheated.

So with that I've have just explained how clean is clean for the center blow hole? Glad you asked!
After cleaning the center tip hole, fire the torch up with a little act/oxy mix. I hate those black carbon fluffies that fly around when you have too much acetylene. :)
Set the acetylene too keep the flame, without oxygen, in touch with the cutting head tip. If there is a air gap between base of the acetylene flame and the tip, then you have too much acetylene. The next step id too set the oxygen.
Oxygen is set by turning the green knob on the mixing chamber: LMAO
Oxygen mix is correct when then the heating flame is just cone shaped with a "rounded cone" top to the flame tip. Reread this as it's important. A sharp point cone is too much oxygen added and is called an oxidizing flame! Anotherwords too much oxygen. An that you don't want!
Now that you have the preheat set correct it's time to set the cutting flame, the center hole gas mix. The forward gas valve controls oxygen on the cutting head.

Next depress the cutting lever. Thats is what blows the preheated metal away and cuts the metal. This "center" flame cone should have very clean lines on the cone edge extending out to the end of the flame cone. If the edges of the cone are ragged looking or the center cone is very short, then the tip center hole needs cleaned once again, thus reapeating the test for a clean center flame hole. It may take you several trys of cleaning the center tip hole to get the flame cone correct but that is the first seceret to burning a slag free basemetal underside.

2) The second influnance on cutting a slag free cut, is the cutting speed that the torch is moved forward for a given amount of base metal preheat BTU. Although this travel speed is important, it's much more important to pay attention to the cleanness of the center blow hole when free hand cutting.
Automated Machine travel cutting will tolorate a more dirty cutting hole than hand cutting.

GAS WELDING:
1) I use 20psi Oxygen and 7 psi Acetylene. Pressures are set with torch valves OFF! Same with cutting pressures. The only reason I drop the oxygen pressure while brazing/welding is to keep from blowing my flame mix out if I bump the oxygen control valve.
The same procedures are used for setting the welding flame as setting the preheat cutting flame. Pay close attention to the cone. A nice rounded cone flame tip is what your wanting.

Notice that I never raised my acetylene pressure for either cutting or welding thus it never over draws the acetylene cylinder size. I also use these pressure settings for the acetylene "B" tanks and never over draw them.

I buy the largest cylinder size for cost efficetiveness and so I don't have run and get them filled all the time. Thats the only reason tho. Get what ever size you feel you can handle weight wise as they do get heavy to lift if you don't know how to lift them.

I'm sure I have forgot something so e-mail me if you like as I don't post my e-mail addy for spam concerns.

[email protected]

T_Bone

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