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Scott engine driven arc welder

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Greg

05-02-2003 18:00:46




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I got a portable welder today, It is a Scott 175 amp d.c. Powered by a 11 H.P Briggs, it has 100% duty cycle open circit is 70 V. I have a few questions on it, Will it power a TIG rig? The accesory plug says 120 v dc, can I make it to run 120 v ac? I have a Miller Bobcat with a bad engine, is there a way I can take the inverter out so I will have 120 v ac? This was a GI issue machine, it was still in the crate, it runs and welds nice Any one have any experiance with this rig? I traded a good .22 rifle for it. Any input will be appreciated. Thanks, G.

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T_Bone

05-02-2003 21:35:51




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 Re: Scott engine driven arc welder in reply to Greg, 05-02-2003 18:00:46  
Hi Greg,

Yep it'll do Tig scratch start. DCEN or straight polarity with 2% thoriated tungsten (most popular) or with DCEP or reverse polarity with pure tungsten (generaly not a good choice).

Could it be a CU wound generator? Might have a fairly good stable arc if it does.

A DC generator uses a split communtaitor(sp) ring that gives the DC pulse wave form. You would need to add a DC/AC invertor bridge for sine wave AC.
Resistive loads work equally well DC or AC. Induced loads don't like DC but it can be done and expensive.


T_Bone

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welder7789

05-02-2003 21:55:22




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 Re: Re: Scott engine driven arc welder in reply to T_Bone, 05-02-2003 21:35:51  
yaeh what t-bone said!



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Central Minnesota

05-02-2003 19:00:35




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 Re: Scott engine driven arc welder in reply to Greg, 05-02-2003 18:00:46  
Will it power a tig torch? Yes. It might not be a real smooth arc though. It'll probably do light stuff pretty good. Mild steel rod, stainless, and everdur. It won't run Aluminum. The outlet is exactly as it says DC. You can't make it put out AC so don't plug any of your good variable speed tools into it. Only universal brush type motors. You got a buy. Have fun with it. The guy in this forum that wants to build one is probably crying right now.

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Central Minnesota

05-02-2003 19:02:00




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 Re: Re: Scott engine driven arc welder in reply to Central Minnesota, 05-02-2003 19:00:35  
PS. The tig uses reverse polarity.



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Bill 52 8n

05-03-2003 16:33:38




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 Re: Re: Re: Scott engine driven arc welder in reply to Central Minnesota, 05-02-2003 19:02:00  
If you use reverse, your tungsten will ball up on the end. You are better off using straight polarity.

Bill



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