Welding socket needed for 17th edition board?

[Agile]

I want to build a simple spot welder using an old microwave oven transformer with the secondary rewound. Hoping to be able to weld at least two 1 mm thick steel sheets together!

Does anyone know what is the best OC voltage to wind the transformer for?

Hopefully I will not need DNO approval !

Tony

 

[skotl]

I want to build a simple spot welder using an old microwave oven transformer with the secondary rewound. Hoping to be able to weld at least two 1 mm thick steel sheets together!

Does anyone know what is the best OC voltage to wind the transformer for?

Hopefully I will not need DNO approval !

Tony

It's a welder! So, apparently it does need DNO approval!

Anyways no idea the answer to your question, but you could try on www.mig-welding.co.uk

 

[aesmith]

If you read back through the posts you will see that aesmith is fed from his own transformer, so the two wires coming across the field will be two phases of a 3 phase HV line (either 6.6 or 11kV) between them and the 15kVA transformer (possibly actually 16kVA being the standard size) he talks about will transform that to 250V as it will be a standard ESI version.

Correct, 11kV and yes it is 16kVA looking closer at the plate. So wandering further off topic, does that mean that the HV line is 11kV between phases, rather than phase to neutral?

 

[westie101]

does that mean that the HV line is 11kV between phases, rather than phase to neutral?

HV lines do not actually have a neutral only (in the UK) 2 or three phases
So 11kV is the voltage phase to phase which is around 6350V phase to earth.

(to convert phase to phase to phase to earth, divide phase to phase by the square root of 3)