Welding Fume extraction set up.
- Thread starter Matt Matt
- Start date
I don't tig enough to think about it, the times I do think about it, I just wear a N95 mask... but always been wanting to build that DIY fume extractor 
Don't think I have room... might just cut a hole in the roof and put up and exhaust.
Don't think I have room... might just cut a hole in the roof and put up and exhaust.fnieto
Well-known member
Bought this Aercology at auction for $200. A 110v unit and utilizes a large Donaldson cartridge filter. Shop air back blow purge that dumps into a pullout clean out drawer. Don't use it very often but when I weld known nasties its used. It also had a side draw tube that can be used vs the trunk boom. They make smaller units as well. Keep an eye out for a preowned unit.
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Bretny
Well-known member
I don't tig enough to think about it, the times I do think about it, I just wear a N95 mask... but always been wanting to build that DIY fume extractor
If i remember correctly N95 masks are for dust not welding fumes.
Also anyone welding on stainless should look into what chemicals/gas are actualy in the fumes. Its prety nasty stuff.
PAToyota
Well-known member
Although welding respirators can be N95, not all N95 respirators are suitable for welding. A good resource is 3M's Welding Respirator brochure: http://multimedia.3m.com/mws/media/1028293O/respirators-for-welding-brochure-70-0716-7146-8.pdf
U sure it wasn't zinc / galvanized stuff?
Welding stainless steel or other alloy steels (non-stainless stuff) can expose you to:
- chromium, including hexavalent chromium
- nickel
- molybdenum
- manganese
- zinc
- cadmium
http://www.lincolnelectric.com/en-us/education-center/welding-safety/Pages/fumes-gases-faqs.aspx
http://www.lincolnelectric.com/en-us/education-center/welding-safety/Pages/welding-safety.aspx
rlitman
Well-known member
The "fumes" are in the form of smoke, which is particulate in nature (i.e. in the solid, and not gaseous state). An N100 (or P100) filter would be appropriate (N95 would just barely be helpful). N100 is just better at these finer particles than an N95.
Because these fumes are not gases, adding an activated carbon type vapor filter would not help (not that you said this, I'm just pointing it out).
When it comes to welding stainless, hexavalent chromium is found in MIG welding fumes, but does not tend to be found in TIG fumes.
Stay away from welding anything with lots of manganese. That's REAL bad stuff for you.
gahrajmahal
Well-known member
We did a tour of our art museum restoration shop a year or two ago and I loved their fume extractor setup. The squirrel cage fans were at the ceiling, probably half as big as a furnace fan. They had around 6" dia. Rubberized flex hose. The articulated bracketry looked like a desk lamp with springs at the joints, just like the lamp but about twice the size. The hood was very simple around 1 foot square with built in LED lighting. The switches for the fan and light were at the hood. They had around 4 foot of movement up and down and swivel at the hood. They were sucking the wide variety of caustic fumes from the solvents they use to clean paintings, textiles and all artwork that was getting restored. Quite fascinating. It is a shame you need about 20 years of school and an art history degree to clean paintings, I would have liked to give it a go.
steel 35
Well-known member
This has not been the case within my research.
:rlitman
Well-known member
This has not been the case within my research.
Where have you looked:
http://www.public.navy.mil/NAVSAFEC...h/NSRP_Hexavalent_Chromium_Exposures-0108.pdf
"Data analysis shows that the mean exposure during TIG welding, regardless of the base metal, is
below the OSHA criteria for exemption from the standard. Based on the data analyzed, there is
95% confidence that 95% of the measured exposures during TIG welding were below the OSHA
Action Level, regardless of the base metal. "
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"Data analysis shows that the mean exposure during MIG welding is below OSHA Action Level.
Based on the data analyzed, there is 95% confidence that 95% of the measured exposures during
MIG welding were below the OSHA Action Level for welding on HY-80, HY-100, and AH-36.
Higher exposures were measured during work on corrosion resistant (CRES) metals. While
measured exposures during work on “stainless steel” were well below the OSHA Action Level,
other CRES metals, including Inconel, 304, and 316 had higher measured exposures. Based on
the data analyzed, there is a significant probability that measured exposures during MIG welding
on CRES base metals could exceed the OSHA PEL.
Analyzing the data based on the type of electrode, it is clear that those electrodes containing
more than 10% chromium (referred to as Hi-Cr electrodes in this report) result in substantially
higher CrVI exposures than those that contain little or no chromium. Hi-Cr electrodes and filler
metals reported in the data are shown in Table 5. Based on the data analyzed, there is 95%
confidence that 95% of the measured exposures during MIG welding with electrodes that do not
contain substantial amounts of chromium were well below the OSHA Action Level. "
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"Based on the data analyzed, there is a significant probability that measured exposures during
FCAW welding could exceed the OSHA PEL. One exception to this includes FCAW on AH-
36; however, there is still a significant probability that measured exposures could exceed the
OSHA Action Level. "
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"Based on the data analyzed, there is a significant probability that measured exposures during
SMAW welding exceed the OSHA PEL. One exception to this includes SMAW on AH-36.
The UTL for SMAW on AH-36 was less than the OSHA Action Level. "
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xman_charl
Well-known member
welding galvanized stuff will produce cyanide fumes...
This is an eight inch ventilator, hf.
ceiling of garage supports mechanism, tube goes about 20 feet, out of garage
thing lowers down, welding table, can adjust height...
Charl
This is an eight inch ventilator, hf.
ceiling of garage supports mechanism, tube goes about 20 feet, out of garage
thing lowers down, welding table, can adjust height...
Charl
steel 35
Well-known member
Our whole shop is plumbed with Nederman extractors with monster fans on the roof, which can replenish the air in the shop in 6 minutes.
We don't normally turn both of the fans on because of the jet engine level noise. and the shop door has to stay open otherwise it will starve the flow.
We are lucky enough to have supplied breathing air system when grinding and cutting.
http://www.nederman.com/en/industry_solutions/welding_and_cutting/welding_fume_extraction
We don't normally turn both of the fans on because of the jet engine level noise. and the shop door has to stay open otherwise it will starve the flow.
We are lucky enough to have supplied breathing air system when grinding and cutting.
http://www.nederman.com/en/industry_solutions/welding_and_cutting/welding_fume_extraction
rlitman
Well-known member
It produces zinc oxide fumes, which are toxic enough.
I like that ventilator idea though.