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Old 01-08-2019, 05:59 PM
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biker55 biker55 is offline
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Default oxy propane issue

Hello all, just recently purchased a oxy propane cutting torch. no experience with this. today while cutting some metal noticed that the cutting tip was getting orange and next I heard was a rapid series of popping noise and then I heard a final pop and the flame went out. I then saw that the retaining nut that holds the cutting tip was damaged. anyone knows what would cause this? here's a pic. of the damage.
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  #2  
Old 01-08-2019, 07:10 PM
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The tip should never be red hot. You may have a loose nut or damage to the seating that is allowing the premixing of gas and oxygen. The gas should always keep the tip cool.

Set propane at 5-8psi and oxy at 35psi. Easier to light if you strike and start with the flame able to blow against a plate or welding table as the flame can be blown out when adjusting. When heating, the greatest heat zone is about 1 inch + away from the tip, unlike acetylene. Propane burns 300 degrees cooler so this is important to know the preheat zone, also called the outer cone.

I think you have serious issues with the torch head or the tip and you have combustion occurring inside the cutting tip. The tip will be destroyed and unable to separate for cleaning.
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Old 01-08-2019, 08:24 PM
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Quote:
Originally Posted by Ironman View Post
The tip should never be red hot. You may have a loose nut or damage to the seating that is allowing the premixing of gas and oxygen. The gas should always keep the tip cool.

Set propane at 5-8psi and oxy at 35psi. Easier to light if you strike and start with the flame able to blow against a plate or welding table as the flame can be blown out when adjusting. When heating, the greatest heat zone is about 1 inch + away from the tip, unlike acetylene. Propane burns 300 degrees cooler so this is important to know the preheat zone, also called the outer cone.

I think you have serious issues with the torch head or the tip and you have combustion occurring inside the cutting tip. The tip will be destroyed and unable to separate for cleaning.
Thanks for responding. I had the propane set at 10 psi and the o2 at 40psi. I was able to separate the tip. all the orifices seem to be clear. however I'm going to need a new nut.
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Old 01-08-2019, 08:26 PM
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The tip pix is not clear enough for me to see.

Is it the proper 2 piece tip ?

When I change the tip, I give it a twist as I bring the tip nut up by hand,
to help seat it (airco/concoa style).

The use the wrench to tighten it.

Are you adding way too much oxygen ?
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Old 01-08-2019, 08:29 PM
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Quote:
Originally Posted by digger doug View Post
The tip pix is not clear enough for me to see.

Is it the proper 2 piece tip ?

When I change the tip, I give it a twist as I bring the tip nut up by hand,
to help seat it (airco/concoa style).

The use the wrench to tighten it.

Are you adding way too much oxygen ?
I just hand tightened. didn't tighten it with a wrench. maybe that's where I messed up. like I said I'm new to this, never used a torch before.
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Old 01-08-2019, 08:40 PM
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Quote:
Originally Posted by biker55 View Post
I just hand tightened. didn't tighten it with a wrench. maybe that's where I messed up. like I said I'm new to this, never used a torch before.
Uh boy....Yes, you need to tighten it with a wrench.

What make of torch ?

and again....is it a 2 piece tip ?
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  #7  
Old 01-08-2019, 11:11 PM
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Quote:
Originally Posted by biker55 View Post
...I just hand tightened. didn't tighten it with a wrench...
There's a reason why they put a hex nut on there. If it were knurled then you might get away with hand tightening...
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Old 01-09-2019, 07:29 AM
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What were you cutting? Was it cutting all the way through? If your tip is undersized and you are holding it jammed up against the work for too long you can also overheat it and burn it up, although that will do damage out on the end, not to the nut.
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