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Posted by Richard Smith on January 4, 2008, 4:50 pm
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Hi everyone.
Question - cut DINSE couplings into welding leads near transformer or
near work - for coupling and uncoupling rectifier.
Have big oil-cooled welder which stays in hull of a barge (other
barges-in-construction moored alongside).
Thought of these
Near transformer - often less distance to carry the rectifier from
the wharf
Near working end of leads - uncouple rectifier for heavy AC welding
and you'd get at least 20% more power, without having to go back to
the transformer
What does anyone reckon?
Thanks in advance
Richard Smith
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Posted by Phil on January 7, 2008, 11:12 am
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> Hi everyone.
>
> Question - cut DINSE couplings into welding leads near transformer or
> near work - for coupling and uncoupling rectifier.
>
> Have big oil-cooled welder which stays in hull of a barge (other
> barges-in-construction moored alongside).
>
> Thought of these
>
> Near transformer - often less distance to carry the rectifier from
> the wharf
>
> Near working end of leads - uncouple rectifier for heavy AC welding
> and you'd get at least 20% more power, without having to go back to
> the transformer
>
> What does anyone reckon?
>
> Thanks in advance
>
> Richard Smith
Rectifier near work means lower losses.
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Posted by RoyJ on January 9, 2008, 9:02 pm
Please log in for more thread options Nope. Rectifier near the transformer means that the lines will see lower
current after rectifier losses.
Phil wrote:
>> Hi everyone.
>>
>> Question - cut DINSE couplings into welding leads near transformer or
>> near work - for coupling and uncoupling rectifier.
>>
>> Have big oil-cooled welder which stays in hull of a barge (other
>> barges-in-construction moored alongside).
>>
>> Thought of these
>>
>> Near transformer - often less distance to carry the rectifier from
>> the wharf
>>
>> Near working end of leads - uncouple rectifier for heavy AC welding
>> and you'd get at least 20% more power, without having to go back to
>> the transformer
>>
>> What does anyone reckon?
>>
>> Thanks in advance
>>
>> Richard Smith
>
> Rectifier near work means lower losses.
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Posted by Ignoramus23170 on January 9, 2008, 9:17 pm
Please log in for more thread options > Nope. Rectifier near the transformer means that the lines will see lower
> current after rectifier losses.
Rectifier loses voltage.
I vote for it does not matter.
i
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Posted by Richard Smith on January 10, 2008, 3:24 pm
Please log in for more thread options Roy - I think Iggy sets us right.
Power loss P=I^2R
(current * current * the resistance of the leads).
Current is conserved - as electrons are matter, they are conserved and
you keep the same quantity of electrons moving in unit time (current).
What you've lost in the rectifier is electrical pressure
(voltage). Power loss in leads is dependent on the current and not on
the voltage.
What I have discovered by experiment, in line with standard guidance,
since my original post:
If the rectifier is next to you, you can change between
electrode-positive (DCEP) for deep fusion or electrode-negative (DCEN)
to get rapid fill with little heat for filling an overly-wide gap
joint. I find the difference very useful. So that finally dictates
the balance - the rectifier goes at the working end of the leads, so I
can swap between DCEP, DCEN and AC.
Thanks Roy and everyone.
RS
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>
> Question - cut DINSE couplings into welding leads near transformer or
> near work - for coupling and uncoupling rectifier.
>
> Have big oil-cooled welder which stays in hull of a barge (other
> barges-in-construction moored alongside).
>
> Thought of these
>
> Near transformer - often less distance to carry the rectifier from
> the wharf
>
> Near working end of leads - uncouple rectifier for heavy AC welding
> and you'd get at least 20% more power, without having to go back to
> the transformer
>
> What does anyone reckon?
>
> Thanks in advance
>
> Richard Smith