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Can anyone tell me more about transformer use in weldingmachines can i use an odd numberhow many amp doesit take to run? Answered

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jtobako

Best Answer 9 years ago

What kind of welder? A tab welder might pull a quarter of an amp, where a construction welder might need 200 amps. Most use transFORMERS (wire coils) to change, say, 120v 15amp to 20v 80amp for a small home or portable unit. Serious welders use 220v.

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kekeifferjtobako

Answer 9 years ago

thank you for your help sorry about the misnomer of the transformer. would you know what Kind of Transformer i should get to use with 20amp 220volt source. some ppl say to run 2 or three microwave transformers together after rewiring the secondary coils but i have access to a second hand electronics warehouse with all sorts of goodies and am wondering if i could find the right Size/Type of transformer there. again thank you for your help kenneth

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jtobakokekeiffer

Answer 9 years ago

Depends on how you want to control the output power. Older units (lincon 'tombstone') use multiple taps off the secondary coil (chose how many turns on the secondary by which lead you connect to) where newer ones control the power going into the transformer. If you are using a random transformer, you need to find out if it needs a power limiting resistor or if it has one. That's one of the nice things about microwave transformers, they are built to be plugged in and you don't have to worry about blowing fuses. You are going to need a step down transformer, how far is going to depend on if you are controlling the input voltage and what you prefer to weld with : ) At a random guess, stepping down to 40 volts would give about 100 amps-that should be a long, strong arc for a beginner.

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lemonie

9 years ago

To the best of my knowledge welders don't use transistors at all. They do use a lot of amps though - have a look on the internet for welders and you'll get an idea of what they input/output. L