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PreciousMexpert

Well-known member
Joined
May 12, 2009
Messages
196
Location
Australia
http://img29.imageshack.us/i/torch0.jpg/
I bought an acetylene torch and I also bought a safety valve
In my propane welding set the safety valve is placed where I have marked A

I tried the same thing with my acetylene set and it didnt work
It works only when I attach it to where it says B
that is right below the hand piece
Is this normal
am I doing something wrong

If I attach it to where it says A the gas does not flow
its the same for oxygen and acetylene
 
I have usually seen them hooked up at the regulator. but that might not be the case any more because of safety.
Where did you get the check valves?
 
Barren Realms 007
I bought a complete set and I ordered it from the same company

and the propane welding set was bought about 20 years ago
so maybe things have changed and I can also ask the company
 
Would you please! The check valve should be there to protect the tanks from ignition. But if there is greese or oil in the line an ignition can take place without protection to the tanks.

I will see if I can find time to check with my welding supplier and see if there have been changes I am not aware of.

Thanks
 
You are paying attention the direction of flow?

You would need to adapt the male/female ends to switch which end of the hose you install this on.

Check with your torch manufacturer many handles are being made with internal check valves.
 
I called the company that sold me the set and they said it does not have a built in safety valve in the regulator and the safety valve only fits behind the hand piece and if I want another safety valve I would have to buy another more expensive kind
He said I don't need another one he said its like a car having 2 mufflers
He said just don't drop a hot metal on it
 
PreciousMexpert said:
I bought an acetylene torch and I also bought a safety valve
In my propane welding set the safety valve is placed where I have marked A

I tried the same thing with my acetylene set and it didnt work
It works only when I attach it to where it says B
that is right below the hand piece
Is this normal
am I doing something wrong

If I attach it to where it says A the gas does not flow
its the same for oxygen and acetylene
There must be something else wrong in your method of installing them.The hoses have the exact same fittings on both sides,and the pressure is exactly the same on both sides.Unless they are fitted with a check valve there is no variable (difference) from either side.Even if one or both were made wrong,it would not work on either side,instead of working on one side but not the other.If they work on one side,they must work on the other,its physics.
 
I have a similar situation
The company selling me said it didnt have a safety valve and yesterday I was doing some welding and the acetylene got jammed and poped and it was not anything serious and all of a sudden I heard an bell ring and when I tried to re-lite the torch I noticed that the valve had gone to zero.
I found that amazing and the people selling the product dont know about it.

On another note when I am welding with acetylene I notice that the 2 pieces that I want to weld have to be touching with the slightest gap and if there is it wont weld
I tried this with very strong fire and still no help
Do I need a tig or a mig system
thanks
 
A check valve’s can be very important on your torch, I prefer to have it at the hose as it enters the torch handle, if you get your torch too hot the hot can cause a fire inside your torch or hoses and possibly in your tanks, the popping you here is a fire in your torch igniting over and over, make sure you have working check valves, and do not overheat your torch, also setting the pressure on your gases properly is important here, for what you are doing (heating welding and cutting), also learn to adjust your flame from the torch with the control valves on the handle for the flame you need for the job (reducing or oxidizing flame).

If welding with an torch metals should be prepared, cleaned fluxed if necessary, fitting before you weld, small gaps can be bridged with experience, using your filler rod or even with small pieces of cut rod (nails or other metal). to get practice with welding I teach people to weld two pieces of metal without using a filler rod, only using the torch flame, melting metal from the two they are welding together, once they can do that then welding with the filler rod becomes easy to do, it will take a little practice to get the hang of welding, just like riding a bicycle, Using proper welding tip for size of metals your welding, adjust your flame hottest blue flame at tip, put the end of this blue flame to the metal to melt the metal, if welding a thick piece and thin piece of metal together concentrate heat on the larger piece getting both red hot almost melted at same time, then melt then together using circular or zig zag motion pushing the molten metal along with the torch flame, not too fast not too slow.

Anybody using a torch should study up on its use and safety, a little time doing this could keep you alive and healthy, the web has any info you need also your local welding supply or library will have some books.
 
golddie said:
I have a similar situation
The company selling me said it didnt have a safety valve and yesterday I was doing some welding and the acetylene got jammed and poped and it was not anything serious and all of a sudden I heard an bell ring and when I tried to re-lite the torch I noticed that the valve had gone to zero.
I found that amazing and the people selling the product dont know about it.

On another note when I am welding with acetylene I notice that the 2 pieces that I want to weld have to be touching with the slightest gap and if there is it wont weld
I tried this with very strong fire and still no help
Do I need a tig or a mig system
thanks

What are your regulator settings? If they are to low you will get a lot of back fires. Check valves can drop your gas pressures by a couple psi. Final pressure is adjusted at the torch valves.
 
Hi Folks
Thanks for your help
qst42know
I did do research and I try to stay withing the safe range
I am able to weld but with acetylene I am new I did a lot of propane welding or soldering.
I tried to weld Aluminum to steel and I couldn't
I should have practiced on something cheap I ruined something that I could have returned back to the store
Is this possible with special flux or solder
 
Aluminum to steel is not going to happen, far to dissimilar. Even if you got it sort of stuck the shrink rate differential would tear it apart.

What is it you are trying to put together?
 
Hi qst42know
I could find an alternative but like you said the aluminum lost its shape and I couldnt get anywhere.
It would be a good invention to come up with a flux or a solder for this purpose
 
Can someone tell me about welding aluminum to aluminum with acetylene
What kind of solder is used
or is just flux enough plus heat the 2 metals
 
Aluminum is very difficult to weld with a torch, aluminum forms oxidation very easily, air and oxygen are you enemies here, they used to make special flux coated rods (had white flux coating) they would work but it was still with much difficulty, the pot or cast aluminum forget it with torch almost impossible. A wire feed with inert gas, or TIG work very well, more control of temperature melt and non oxidizing weld by the shielding atmosphere.
 
I think it is not a good idea to use plumbing tapes inside the bolts when tightening so that there are no leaks
This is true for gases
how about oxygen is it OK to use plumbing tapes
 
PreciousMexpert said:
I think it is not a good idea to use plumbing tapes inside the bolts when tightening so that there are no leaks
This is true for gases
how about oxygen is it OK to use plumbing tapes

If you need to ues a sealant you should replace your fitting's.
 
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