blowtorch

This topic has 14 replies, 8 voices, and was last updated 11 April 2018 at 09:08 by henryb.

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2 April 2018 at 20:07 #348559
henryb
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@henryb
Hello all.

I have a cheap magnum propane blowtorch. I made a little hearth to silver solder a tiny boiler and as the boiler got red just about ready to put the solder on the torch goes out. I am using it in a little shed. do you think i need to use it outside or do the hearth a bit different so it does not suffocate. the boiler was the corner.

Thanks

Henry
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2 April 2018 at 20:07 #9149
henryb
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@henryb
2 April 2018 at 20:11 #348560
JohnF
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@johnf59703
Was the shed door open or closed ?
2 April 2018 at 20:16 #348561
nigel jones 5
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@nigeljones5
You need to let the hearth breathe a bit – the burner had used all availible oxygen, hold torch further away for better results.
2 April 2018 at 20:38 #348567
henryb
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@henryb
Posted by JohnF on 02/04/2018 20:11:21:

Was the shed door open or closed ?

I think it may have been open but it is only a small shed.
2 April 2018 at 22:28 #348576
Michael Briggs
Participant
@michaelbriggs82422
If there was a lack of oxygen in your shed I think you would be physically aware. Sounds to me like a nearly empty gas canister. Regards, Michael.
3 April 2018 at 08:27 #348596
henryb
Participant
@henryb
I will have to have an experiment and see if it keeps going when i hold it outside ect. i think it may be lack of oxygen in the immediate area. i was thinking of putting a tube around the burner so it draws air nearer to my hand (further away from heat)
3 April 2018 at 08:34 #348598
Keith Hale
Participant
@keithhale68713
If the canister is not empty, the answer may well lie in your description of the torch – cheap!

Such torches can starve themselves of air as the cylinder tilts and becomes horizontal. The flame goes out.

What does the company that has your money say?

Regards

Keith
3 April 2018 at 08:58 #348600
not done it yet
Participant
@notdoneityet
If the canister is not near empty or freezing, the answer is more likely in the mode of operation. Poster says ‘it suffocates’. Until that point, it would appear that the burner operates fine. Expensive burners are usually those with often not-needed extras.
3 April 2018 at 09:29 #348609
henryb
Participant
@henryb
The smaller burner has got air holes in the side and the bigger one i put on has air holes in the back and they both go out as soon as the boiler goes red so maybe it has got to do oxygen in that area. i did have the torch horizontal all the time when i was using it.
3 April 2018 at 11:06 #348628
Vic
Participant
@vic
I find my torch goes out if I get it too near the back of the hearth. Moving the workpiece forward of the hearth normally does the trick.
3 April 2018 at 11:13 #348631
Roderick Jenkins
Participant
@roderickjenkins93242
I've had the same problem as Vic with Sievert torches. I think the combustion products get bounced back towards the torch and dilute the incoming air supply. A cyclone burner, which has the air input closer to the handle, helps but even this has problems in a confined area like firebox.

Rod
3 April 2018 at 12:08 #348640
Vic
Participant
@vic
Yes mines a Sievert torch as well Rod. I use refractory bricks as a temporary “hearth” so maybe the reflected heat doesn’t help either. As I say though, moving the work away from the back of my hearth usually does the trick.
3 April 2018 at 20:59 #348716
henryb
Participant
@henryb
Thanks for the help everyone. i will just try putting a tube on the burner to see if it helps.
11 April 2018 at 09:08 #349787
henryb
Participant
@henryb
i turned the adjustable regulator down a bit and that seems to help a lot.
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