- Thread starter skotl
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DAPPH
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I think you'll find that the plastic tube duct will degrade & split quite quickly due to the UV content of the welding arc .
You can get 100 mm aluminium flexi duct from " Wickes " on line , it does not melt holes but it does reflect light unless you matt black spray it every now & then .
If it does not fit the flange/collar of the fan perhaps cut up some old 100mm /110 mm cleaned soil or vent pipe to make an insert and collar to fit , glue weld it to the fan unit .
You can get 100 mm aluminium flexi duct from " Wickes " on line , it does not melt holes but it does reflect light unless you matt black spray it every now & then .
If it does not fit the flange/collar of the fan perhaps cut up some old 100mm /110 mm cleaned soil or vent pipe to make an insert and collar to fit , glue weld it to the fan unit .
daleyd
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I was wondering how long the plastic duct would last? Top job though!! Unfortunately due to my garage being a total dump most of my welding is confined to the outdoors
CRB
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That's the ticket.So, like this? (excuse the bad artwork - best I could do in ten minutes!)
If you do not want to use the compressor, you could use the fan in its' place.
The fumes would enter at the left in this setup.
wheresmejumper
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Why wouldn't you just use that fan inlet instead of the modified pipework?^^
CRB
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All the crap and nasty fumes are carried by moving air without touching the expensive fan. I know we are probably not going to be using it to the extent that any of those fumes would affect the fan. ?Why make a problem for the future?
wheresmejumper
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Yeah fair enough.i would prefer more suction myself but i see your point
CRB
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Someone with a brain may be along soon, but I think the fan would move 'so many' litres of air through a system. That stays the same wherever the fan is, pushing or pulling. However, using that air movement to draw extra air would increase the extraction at the welding site.
A little picture soon.
Edit: The first few words sound a bit rude, I mean a clever chap to prove me wrong probably, not a disparaging remark towards 'wheresmejumper'
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wheresmejumper
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That wouldnt add up to extra air removed from the welding site unless the fan inlet was utilised for fume extraction also,you would thinkCRB said:
eSCHEn
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My money is on the answer being a black eye or a thick lipIle ask the wife later iff its better to suck or blow...then come back with the answer
roofman
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My money is on the answer being a black eye or a thick lip
shes in the other room,ile email her.
eSCHEn
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In that case I retract my earlier guess and change it to a reply of "Why don't you come in here and find out?"
I'm a tad concerned that it is thin plastic and welding that close to the opening there is a chance of sucking up something very hot, if it gets caught in one of the riffles in the pipe you may look out at your shed burning later. Just a thought.
wheresmejumper
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DAPPH
as dyslexik as I'm daft
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One thing no one has really mentioned is that you have to be aware of is short circuit routes where the air will not be cleansed . It's all well and good saying the system extracts so many cubic meters per hour but does it actually remove that volume of fume laden air . Having the biggest quietest extractor fan system you can afford , taking the air from the immediate area of the weld via a big bore flexi pipe system is perhaps the best solution for the home workshop..
I strongly suspect that the venturi idea has to be tuned to the set up using a vacuum gauge & a pair of pressure gauges or similar .
The idea of it being run along right behind a small moving submerged arc sucking up the unused flux and fumes in the flux is the ideal solution for that instance . Not many DIY at home welders will have the machinery nor the space required to install or use such a luxury every time they weld up .
I strongly suspect that the venturi idea has to be tuned to the set up using a vacuum gauge & a pair of pressure gauges or similar .
The idea of it being run along right behind a small moving submerged arc sucking up the unused flux and fumes in the flux is the ideal solution for that instance . Not many DIY at home welders will have the machinery nor the space required to install or use such a luxury every time they weld up .
wheresmejumper
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I used tapering plastic plant pots as reducers.just cut to size
