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Tig welding with my ac lincoln buzz box ??

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doggwelder

02-12-2003 15:09:52




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Tig welding mild steel with my lincoln ac 225 welder. Is it possible ? The welders handbook say's so , but has anybody ever tried it ??




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Fred OH (long)

02-14-2003 07:50:02




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 Re: Tig welding with my ac lincoln buzz box ?? in reply to doggwelder, 02-12-2003 15:09:52  
A comment on the amp adjusting thing (foot pedal)...used to be if your welder had a infinite amp adjustment handwheel on the front...you could take it off and install a gear in it's place and bolt on a little gearhead (reversible) motor assembly and run a couple of leads to the torch and control amperage from the torch by thumbing a switch back and forth. Probably not as responsive as the foot pedal....but do-able. I think that Lincoln sold them in the 70's as I bought the hi freq unit for a Lincoln Ideal Arc AC-DC 300/250 from them and noticed it in the pamphlet that came with it. If you're electronically challenged on the SCR type control...this might be for you. If you're planning on using this for aluminum...bear in mind that AL dissipates a lot of heat...keep within the duty cycle of the machine. I also took the cover off of the welder every once in a while and blew all the dust out. TIG is full time welding and the machine needs every advantage it can get. I have a Hobart hi freq unit out in the shop that I thought I would hook up to the Airco Bumble Bee welder but I seem to have run out of steam in that direction. Anyone else got a Airco shop welder? Heaviest built machine I ever saw...big 'ol foot square transformers welded together with a lifting eye welded to that. L8R....Fred OH

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Dan

02-13-2003 10:45:17




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 Re: Tig welding with my ac lincoln buzz box ?? in reply to doggwelder, 02-12-2003 15:09:52  
To successfully TIG weld mild steel with your AC buzzbox you need a high frequency unit, which depending on the quality will cost you slightly less or more than if you just went out and bought an AC/DC buzzbox and used the DC side. DC on non critical mild steel work can just be scratch started. No need for the High frequency. AC needs the high frequency to help stabilize the arc so the arc does go out when the AC cycle reaches zero volts when it is cycling between + and -. Also, DC welds mild steel much better then ACHF. The DC arc is smooth, were as the ACHF arc is erratic.

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Ken S.

02-13-2003 07:31:42




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 Re: Tig welding with my ac lincoln buzz box ?? in reply to doggwelder, 02-12-2003 15:09:52  
The Lincoln combination is simular to the Tig outfit I have, using the same principle. I have a Miller Dialarc 250 AC/DC unit, with the high freq. unit and a water cooler. I also have a footpedal control made out of a large reastat control off of something. It works great from small stuff to real big stuff. The Dialarc has got the guts. By the way, this unit is for sale. Contact me at [email protected]

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Robert

02-13-2003 05:11:18




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 Re: Tig welding with my ac lincoln buzz box ?? in reply to doggwelder, 02-12-2003 15:09:52  
yup..
iv got a good ole lincoln buzz box and i picked up a high frequency converter, also made by lincoln to do just that. The only other one that I have ever seen being used was when we did some work in the Coca Cola plant.. Their maintenence shop had one that looked like it had been there for decades. It's a nifty little device though it's got a solonoid in it so you can run your argon bottle through it and everything. I love mine, it works great. I actually plan on putting a section up about it on my website. Happy welding

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MarkB

02-12-2003 17:43:22




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 Re: Tig welding with my ac lincoln buzz box ?? in reply to doggwelder, 02-12-2003 15:09:52  
Lincoln sells a gadget to convert your buzz box to TIG. I saw this at an exhibit, the Lincoln factory rep was a little cautious about recommending it. It was fairly cheap as I recall, you might give it a shot.



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Mark

02-12-2003 17:02:42




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 Re: Tig welding with my ac lincoln buzz box ?? in reply to doggwelder, 02-12-2003 15:09:52  
It's very possible. Check out www.diywelder.com
There's a mailing list that talks about this, you can subscribe or check the archives for a bunch of
info. You can use a buzz box for TIG very easily, but you won't have heat control on a typical buzz box without a foot pedal. There's a way around this
that we on the diywelder list have come up with using phase control and SCR's of the mains into the
buzz box. Bill the arcstarter is working on the circuit board. Add a TIG torch and you can scratch start. If you want high frequency start, you can add a high freq box from miller or lincoln
or build your own pretty easily as well. Check out the website. It will explain more than
I can.

Hope this helps

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Mike W

02-12-2003 17:44:39




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 Re: Re: Tig welding with my ac lincoln buzz box ?? in reply to Mark, 02-12-2003 17:02:42  
Yew, you can do it. I have a 225 amp Linde. I picked up a Lincoln HF box for it. I made a SCR control for the 240v input to the welder. I use a home built foot control to trigger the SCR's. I set the buzz box to the max current I want. The foot control will vary the output from 0 to the max set. The HF is really only needed for aluminum. Works great.



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