maybe try a D Curve 25amp breaker. D Curve circuit breakers essentially dont trip when short there are short , sharp increases in load. Designed for welders and motors.
tygertung,
Dec 13, 6:16pm
It's onlky got a choke, so could be miles off.
Tried pre-heating with a gas torch, but it didn't help much and made the joint slightly sooty which was not ideal.
tygertung,
Dec 13, 6:19pm
D curve would be good, but 25 amps is still less than the 26 amps which a 6 kva appliance draws at 230 volts.
martin11,
Dec 13, 6:32pm
If its going to be a structural weld you need to get the correct gear to do it properly .
tweake,
Dec 13, 9:42pm
the choke should only be on the DC output side and not effect AC side.
one thought tho, how about fitting a power factor correction capacitor to the welder. i'm not sure how much that would drop the supply current but if it say drops the current by 5 amps that makes life a whole lot easier on the breaker. i have no idea what type or size you would need, its a little old school for me.
tweake,
Dec 13, 11:15pm
just been looking up PFC and i think we have made a small mistake here.
we keep assuming its 26 amps, but thats only at a power factor of 1 which it will never be. odds are your drawing 30+ amps. circuit breakers handle that for certain length of time depending on the curve (ie d curve).
tygertung,
Dec 14, 12:48am
Yes, I just checked the data plate and the power factor 0.8 which is not exactly unity.
It is the old style welder with the choke down the middle of the transformer which adjusts the amount of flux permissible thus the output current.
tweake,
Sep 3, 9:10am
i'll have to look up the power factor, that kind of sounds ok but even still i guess if you can get that close to 1, thats 20% less amps ? worth looking into, any reduction in current draw will help.
ok that "choke". sorry used to choke and cap on the dc output for smoothing. not uncommon for dials to be off. even on digital ones don't always read true.
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