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Old 10-17-2013, 07:13 AM   #3676
dmaxmike
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my 2 cents on the MIG vs. TIG thing... at our shop we do mostly ASME pressure piping and pressure vessels. and for the really big vessels we usually do TIG root with sub arc the rest of the way out. for the piping we spin everything we can again using a TIG root and usually STT the rest of the way out or if its a funky elbow we TIG it out. flux core and solid wire MIG is really only used for structural stuff around here.
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Old 10-18-2013, 12:27 AM   #3677
Twin-shocker
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Welding gears together?

Wonder if anyone has ever welded gears? I am looking to remove the centre out of a helical cut crank pinion, and fit it with the teeth from a straight cut gear. Can get the cutting done very accurately with EDM, just wondering what filler might be best to use?
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Old 10-18-2013, 02:56 AM   #3678
David R
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What is the gear made out of? Can you re heat teat the teeth once done?

David
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Old 10-18-2013, 05:04 AM   #3679
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Quote:
Originally Posted by Twin-shocker View Post
Wonder if anyone has ever welded gears? I am looking to remove the centre out of a helical cut crank pinion, and fit it with the teeth from a straight cut gear. Can get the cutting done very accurately with EDM, just wondering what filler might be best to use?
Have some "keys" cut in the parts...to interlock them, taking the load directly off the weld..

I have built the worn dogs up on transmission gears using P-20 and H-13..with good results.
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Old 10-18-2013, 06:49 AM   #3680
dmaxmike
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Quote:
Originally Posted by Twin-shocker View Post
Wonder if anyone has ever welded gears? I am looking to remove the centre out of a helical cut crank pinion, and fit it with the teeth from a straight cut gear. Can get the cutting done very accurately with EDM, just wondering what filler might be best to use?
I have welded lots of spider gears in rear-ends together with just plain old ER70-2, they are all still turning. and most of those were late night projects with 2 much beer and not enough metal prep
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Old 10-18-2013, 09:18 AM   #3681
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Quote:
Originally Posted by dmaxmike View Post
I have welded lots of spider gears in rear-ends together with just plain old ER70-2, they are all still turning. and most of those were late night projects with 2 much beer and not enough metal prep
Ditto that with making offset front sprockets for bikes...no issues with ER70s-2, even on some high Hp dragbikes with Big tires.
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Old 10-18-2013, 09:50 AM   #3682
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Thanks all for the info. Gear is a for a relatively low powered trials bike, so I hope the welded gear will hold up ok.
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Old 10-18-2013, 10:52 AM   #3683
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Quote:
Originally Posted by NitroAcres View Post
What kinda stuff do you weld with a MIG>?

I find less use and applications where it is acceptable in what I do...as a matter of fact, most prints say GTAW..

MIG around my shop is relegated to boat trailers and trashcans..while the 6K & 13K TIG machines are actually makin me money

Nothing but trash cans and boat trailers. We've done this in another thread I'm pretty sure, you are clearly superior.

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Old 10-18-2013, 11:33 AM   #3684
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Anyone know where to get teflon liner from? I need one to fit a 10' long loom. I can only seem to find less than 10'.
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Old 10-18-2013, 12:07 PM   #3685
David R
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Originally Posted by TeneRay View Post
Anyone know where to get teflon liner from? I need one to fit a 10' long loom. I can only seem to find less than 10'.
Here?

https://weldingsupply.com/cgi-bin/ei...40:UNDEF::::PL

a few of the good websites are gone, like weldingdepot.com. Miss that one!

For aluminum mig?
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Old 10-18-2013, 12:12 PM   #3686
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Quote:
Originally Posted by David R View Post
Here?

https://weldingsupply.com/cgi-bin/ei...40:UNDEF::::PL

a few of the good websites are gone, like weldingdepot.com. Miss that one!

For aluminum mig?
Thanks!

Si Senor. Welding aluminum.

Much cheaper than buying a spool gun.
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Old 10-18-2013, 01:27 PM   #3687
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Another place to buy the 194014 liner for Miller mig guns: http://www.amazon.com/Liner-194-014-.../dp/B0074BDV0E

The liner is 15' and may require trimming to the length needed.
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Old 10-18-2013, 01:33 PM   #3688
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I have a little (15#) CO2 tank I picked up off of CL a while back figuring I'd use it for welding (didn't have one at the time) or keg beer. I recently picked up a PowerMig 180. I got it running & tested with my little tank. That tank is empty now and I'm hearing that the local places don't like to fill owner tanks and that I maybe should be running 75/25 Ar/CO2 instead of just CO2?

I don't really have a set use for it yet...repairing the horse trailer, this & that around the house as needed.

Thoughts on gas needed and/or leasing/renting vs having mine tested & refilling it?
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Old 10-18-2013, 02:18 PM   #3689
NitroAcres
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Quote:
Originally Posted by larryboy View Post
Nothing but trash cans and boat trailers. We've done this in another thread I'm pretty sure, you are clearly superior.

Took you long enough to RekOnize...

Ok Ok there are other applications.. Trash Compactors, Tow Trucks, Hand Rails, StockCars... ShipYards.... Just nothing I have a real interest in

TIG 24/7/363

:)
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Old 10-18-2013, 02:22 PM   #3690
David R
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C02 is a different animal. Most places around here will fill owner tanks. Soda distributors may also fill it.

For your machine, co2 will weld with a little more spatter and a little more penetration. The trade off is you will need an extra volt (welding volt) for the Co2 compared to C/25.

C/25 (25% Co2/75% argon) will make a smoother looking, less spatter weld.

Co2 is MUCH cheaper especially if you own your tank. Harbor freight and Tractor supply sell tanks. They will also exchange their own tanks.

It should be worth your time too look around and get your Co2 tank filled.

Have fun with your new machine.
David
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