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Tool Talk Discussion Forum

Re: I think I need a new welder

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Author  [Modern View]

07-03-2013 12:23:57

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I've added a rectifier to my ancient Smith stick welder. Can you tell me the value of the capacitors on your machine.

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36 coupe

07-04-2013 01:12:20

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 Re: I think I need a new welder in reply to jimlll, 07-03-2013 12:23:57  
Adding capacitors will bring the open circuit voltage up to 95 volts.Too much.You need a choke coil on a DC converter.

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07-04-2013 11:05:05

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 Re: I think I need a new welder in reply to 36 coupe, 07-04-2013 01:12:20  
I have a circuit diagram from a manufactured unit that indicates capacitors, but does not give the capacity. I think they are used to smooth the peaks.

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Greg 2N (TX)

07-04-2013 21:35:24

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 Re: I think I need a new welder in reply to jimlll, 07-04-2013 11:05:05  
OK let me take a stab at this...
Yes the cap smooths the full-wave bridge-rectified DC and also raises the average voltage to the level of the top of the peaks. Bad news is when you go to start the arc you get a big nasty snap :-( , not good...
Having just an inductor choke coil is good for starting the arc and for maintaining the arc.
The coil limits the inrush pulsating DC current when starting the arc.
The coil also maintains the pulsating DC arc nicely once started.

All I can say is if you insist on a big fat cap, then better have a "large" choke coil to limit the inrush current when starting the arc.


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36 coupe

07-06-2013 14:44:16

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 Re: I think I need a new welder in reply to Greg 2N (TX), 07-04-2013 21:35:24  
You need a bleeder resistor across the capacitor bank to discharge it when the welder is turned off.Finding a choke coil is a major problem.I made one for my converter.Replacement welder parts must be made with gold.

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36 coupe

07-04-2013 15:33:07

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 Re: I think I need a new welder in reply to jimlll, 07-04-2013 11:05:05  
They raise the total voltage..

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