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Old 02-09-2017, 01:36 PM
crystallographic crystallographic is offline
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Default Clean fuel gas - have you had lumpy rough welds?

I've been getting dirty fuel gas for so long that I had come to accept returning the bottles, until now.
My supplier started delivering slightly dirty gas, then dirtier gas over the years. But when I left their supply area and did aluminum jobs in OR, WA, WI, FL, NH, MT, PA and TX the problem disappeared. It was not the oxygen because that has to be produced at a specific level of purity for medical service. (I did transport my entire setup - minus bottles - out of state one time and carefully substituted each component to isolate the exact source of the dirt/contamination - PRESTO: my acetylene was greasy.)

Two years ago I started getting inquiries about problems with O/A welding aluminum - and tested and found to be dirty gas.

So, what do dirty-gas O/A welds on aluminum look like?
Topside:
P1160609copy.jpg

But the roots should be clean:
P1160610copy.jpg
....because the gas does not touch the root side.

Clean O/A aluminum welds can look like this:
good clean O_A weld 3003 copy.jpg
O_A on .040 3003 .jpg
P1130433 fusion copy.jpg
hot and fast .050 3003 .jpg

So, after consulting with one of my engineers, he found the correct filter element and we made a sturdy durable compact canister for welding gas filtration.
https://www.tinmantech.com/products/...lding-filters/

There is more expensive and elaborate welding gas filtration gear on the market, but I wanted a simple effective one that was easy to install. Our early prototypes have been testing in the field for 1.5 years, with very significant results.
P1030224 copy copy.jpg

P1030300 copy.jpg

P1030304 copy.jpg

Here's the kicker in this funky gas supply circus, for me:
I have known for years that our huge gas supplier had the most decrepit and archaic acetylene generation facility in the US, and that they continued to contaminate clean bottles arriving from other chains with their product. Then I learned that these contaminated bottles were arriving in NE, OH and other locales across the US, so our asking for a fresh bottle was not going to avoid the root cause for very much longer .... Our huge gas supplier has now rebuilt their legendary generation plant - but the thousands of funky bottles remain in circulation, across the US.
Caveat Emptor.
(just doing what we can....)
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Last edited by crystallographic; 02-09-2017 at 04:11 PM.
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Old 02-09-2017, 05:22 PM
Ken Hosford Ken Hosford is offline
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Kent
I just look at you link to filter , Than I checked one I had book marked .
Wow you have a good price on the filter , my book marked one was $100 more . Ken
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Old 02-09-2017, 06:30 PM
robtg robtg is offline
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Been fighting dirty O/A gas for years. Ordered a filter 5 minutes ago.
Thanks Kent. ---RG
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Old 02-09-2017, 07:12 PM
blue62 blue62 is offline
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kent

I am a total novice at anything to do with metalshaping or welding.
It's great to have access to your knowledge even if only via the forum and your DVD's.
Thanks
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Old 02-09-2017, 09:05 PM
crystallographic crystallographic is offline
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Glad to help, guys.

Dave, welcome to the novitiate world - where you have to learn some by watching others make mistakes because ain't enough time to make 'em all yourself ....
Glad you are aboard. (Give my best to Ray - loved the story of the cat in the briefcase, that drank ginger ale ....)
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Old 02-14-2017, 01:46 PM
Gando Gando is offline
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lumpy rough welds?.....is there another way to do it?
Gando
David Gandy
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Old 02-14-2017, 06:53 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Gando View Post
lumpy rough welds?.....is there another way to do it?
Gando
David Gandy
Yeah, we can all relate ...

...but when you find out there is a "cleanliness/prep" reason for some lumps - then those lumps can be subdued. Having rough welds for a few weeks is discouraging when it is the gas supplier helping you.
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Old 02-15-2017, 08:05 AM
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Steve Hamilton Steve Hamilton is offline
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Hi Kent

Thanks for doing the leg work to solve the bad gas problem!!!

From your 1.5 Year test, how long does the filter work before it fails to filter out the bad stuff?
Is the filter element a replaceable item?

Thanks Steve
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Old 02-15-2017, 09:26 AM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Steve Hamilton View Post
Hi Kent

Thanks for doing the leg work to solve the bad gas problem!!!

From your 1.5 Year test, how long does the filter work before it fails to filter out the bad stuff?
Is the filter element a replaceable item?

Thanks Steve
Thanks Steve.
The filter element is designed to go 24/7 for two+ years, though as it gets dirty it filters better.
The canister unscrews so the filter can be replaced. We sell the replacement elements for $40.
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Old 02-15-2017, 02:31 PM
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Steve Hamilton Steve Hamilton is offline
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Thanks Kent
That sounds like good value, for a clean gas.

Steve
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