Welding Tips and Tricks

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I have this welding machine
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but i don't known what type is, and i don't find a schematic or service manual for it.

Welcome to the forum. I did a quick check but didn't find anything about make and model. Does it weld?

it's seem like a inverter maybe produced in italy but i don't known who is EWS company/manufacture

Agreed, an inverter with DC output based on the marks on the electrical plate.

How did you come to have it, and does it have cables with fittings to weld? One will be a ground clamp and the other holds the electrode.

another foto
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use irfp 450 and mur diode/rectifier
what tipe of potentiometer i can use because i lost him ...original it's a potentiometer with hole in the midle..2.2ko

Ok, sounds like your machine needs a potentiometer.

If you'll google "2.2k potentiometer" you can view images to see which one is closest to the one you remember- there are several with holes.

Good luck- let us know how it goes!

problem it's not potentiometer ...connection of potentiometer pins is problem ...on the pcb

gabyh wrote:problem it's not potentiometer ...connection of potentiometer pins is problem ...on the pcb

So, cold solder joint?

A common flaw. A simple re-melt with a fully hot and properly tinned 35W soldering iron should have you up and going.

Adding a tiny dab of some fine rosin-core solder is never a bad idea, as there may be oxides inside the failed joint.

i repeat ..problem is ...i don't known which is the pinout on pcb for this potentiometer