Oil cooled Welder.

[Netherfield]

needed a 7/16 spanner as well and where can i get some 10g rods theses days .

Buy Welding Rod 3.2mm | Welding Rod 3.2mm at Zoro

Welding Rod 3.2mm at Zoro. Zoro is UK's leading tools and MRO supplier, featuring the widest range of products from all leading brands.

www.zoro.co.uk

Search Google, not too hard to find really.

 

[dod1e]

Clearly different to the Oxfords then, how could you have a 415v supply that isn't 3 phase? Peak voltage is 440v for both single and 3 phase, just the RMS voltage that differs, 230 for single phase and 415 for 3 phase

Not quite, I think peak voltage is around 340V for single phase, multiply by the square root of 2 to get the RMS (average) value of 240V?

This obviously cycles from -240 to +240 at the supply frequency, so peak to peak is 480 but the opposing peaks never line up so there is never more than the peak 340ish V between the terminals.?

With three phases the waves overlap so when one phase peaks the other two will have some voltage of the opposing polarity, giving increased voltage between the poles and 415V RMS, but each phase is still the same 340V peak / 240V RMS?

Something like that.

 

[Bury the Trash]

Buy Welding Rod 3.2mm | Welding Rod 3.2mm at Zoro

Welding Rod 3.2mm at Zoro. Zoro is UK's leading tools and MRO supplier, featuring the widest range of products from all leading brands.

www.zoro.co.uk

Search Google, not too hard to find really.

no that's 3.2 mm 's

 

[Exfarmer]

and 3 phase is this:
View attachment 1015620

Absolutely no no no!
Take just 2 phases, NO Neutral, and the earth
One phase to 415, one phase to 0 and the earth to centre
415 volt welders are 2 phase not three!

 

[David.]

When would the 380 pole be used then?

 

[Exfarmer]

When would the 380 pole be used then?

I think the 380 will be used sometimes as that is actually a more accurate reflection of the potential difference in the two poles . 415 will be the voltage in a true 3 phase situation but in reality across any two poles the max difference is 380 volts

 

[David.]

Fairly sure my old Oxford used to be wired to O and 380 when on 3ph.

 

[TheTallGuy]

Back in the old days pre EU "harmonisation" the UK mains voltage was specified as 240V nominal which would give a 3 phase voltage of 415V. Much of Europe relied on 220V which would be 380V on 3 phase. The current standard is nominal 230V or 398V 3 phase with a -6/+10% which means that mains supply can be anywhere between 216V and 253V, or 374V and 430V 3 phase.

In the picture above, a 3 phase connection would actually be 2 of 3 phases (sometimes known as cross-phase or inter-phase) e.g. phase 1 to "0" and phase 2 to "400" or "415". The choice of which tapping where multiple options exist to use is down to local conditions as the actual voltage of your supply will depend on how your supply transformer is tapped and distance from the transformer - if you're close to the transformer then it's likely to be higher than being end of line with multiple other users in between.

Most basic transformer welders will not be troubled with moderate over/under voltage as there's no finicky electronics to worry about.

 

[David.]

EMEB had apparatus on our supply for a time back in the day, we had low voltage supply problems.
So that explains why 380v pole was used then.

 

[Bury the Trash]

We've got a 300 amp sip airc ooled transformer with 240 or 415 v option. As well.

He's a beast , infact in a way quite refreshing to use after a little dc inverter.
Don't think I'll be going back to the pickhill to much tho, maybe just for sentiment every now and then.
First welder I bought at 17.,