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Old 14th March 2014, 01:21 PM   #1
kees52 is offline kees52  Netherlands
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Default Power smps for welding.

Hi There

I have order a E71/32/33 core and former, I have these now here.

I did wind it and see that the windings are 3.4 mH where it has to be 4.56 mH as it was already wind by somebody.

I did see that the coilformer has a lot of plat around the middle leg of that core, there is a gap of 1.8 mm, and the coilformer is also smaller so 3.3 mm in length has also here a gap.

I think because the windings are 1.8 mm removed around the middle leg of the core this is the reason that the induction is lower.

Do somebody has experience with it.

And for the nice ones here a schematic of a smps supply 1000 watts output 2 x 85 volts for 500 watt audio amp.
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Old 14th March 2014, 01:38 PM   #2
Mihkus is offline Mihkus  Estonia
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Umm... This is not as easy as you may think...
1kW is maybe for tiny welding... For bigger jobs like 5mm steel I sued to weld at 105A and if i remember the voltage clearly the voltage was near 110V... thats 11 times as much your little transformer can put out. also you need to adjust many things before you can weld...
 
Old 14th March 2014, 03:33 PM   #3
kees52 is offline kees52  Netherlands
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Hi

The 1 kW is a extra for the people here.

http://www.a-and-t-labs.com/K6_Sw_Am...atic/k6pwr.pdf

The welder I do make is a 5 to 160 ampere welder from a russian schematic see picture.
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Last edited by kees52; 14th March 2014 at 03:42 PM.
 
Old 14th March 2014, 03:43 PM   #4
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This is opinion, and just that, but all you need is a transformer with a high current secondary. Say 2 volts, at 100 amps or more.

Well maybe MORE volts but not huge volts. A braizing rig i maintain has a similar output, 0-5v at 50-300 amps.
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Last edited by mondogenerator; 14th March 2014 at 03:46 PM.
 
Old 14th March 2014, 04:28 PM   #5
AndrewT is offline AndrewT  Scotland
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Thw welding set I saw on site to spot weld a strain guage to a cast iron pipe was all in a medium briefcase sized box and was battery powered.
It mostly contained capacitors to store charge.
The capacitors supplied the welding current for the fraction of a second required to melt the metals and this was done at very low voltage.

The mains connected continuous welding sets also work at low voltage.

It's the current that does the heating.
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Old 14th March 2014, 06:00 PM   #6
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by mondogenerator View Post
This is opinion, and just that, but all you need is a transformer with a high current secondary. Say 2 volts, at 100 amps or more.

Well maybe MORE volts but not huge volts. A braizing rig i maintain has a similar output, 0-5v at 50-300 amps.
A welder has a output of 18 to 35 volts, 10 160 ampere of such.

a inverter however give sometimes 70 volts, this keeps the arc going, it is not a spotwelder who is 2 volts and thousends of ampere.

I have a co2 welder who I use for automobile restauration.

The trafo I did wind however did have a coilformer who not fit well on core.

regards
 
Old 21st March 2014, 09:48 PM   #7
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Default Welding with Audio Amp

Hi:
If memory serves there was an article in the old Audio Magazine about the testers using an audio amp to try welding. The amp was HIGH CURRENT , 20 to 30 amps , about 300 watts and a sort of sawtooth wave was used. The testers thought the sawtooth was better than a sine wave.
Maybe someone with an Audio Magazine collection can find the article.
Ed
 
Old 9th April 2014, 11:51 AM   #8
kees52 is offline kees52  Netherlands
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Hi There

Can someone help me translate this hungary to english or dutch?

This give also a welding trafo of use, my need is how it has to be wind.
is it not better to use foil copper band? bobbin width and some paralell
it fils the best.

thanks in advance.

kees
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Old 10th April 2014, 07:52 AM   #9
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The inductance you measure is related to the gap dimension - use a smaller gap if you want a higher inductance, and if the rest of the design is correct for the switchmode requirements.
 
Old 10th April 2014, 10:12 AM   #10
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by trobbins View Post
The inductance you measure is related to the gap dimension - use a smaller gap if you want a higher inductance, and if the rest of the design is correct for the switchmode requirements.
Hi

The version I have do need no gap, I have measure it with no gap at all I have AL 10800 and 3C90 grade as advised.

second post with hungary tekst is a other one who I have schematic from, this schematic is a lot better, have a GAP of 0.1 mm so I need a sheet between the two half of the ferrite? or a other ferrit with a gap only on the middle leg?.

I have wind the primairy now, 8 x 0.8 mm wire.

regards

kees
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