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Posted by Dan on May 12, 2007, 8:42 pm
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I had occasion today to open up my water & gas connections on my 300
amp Miller Syncrowave Tig machine. It appears to me that a shielded
cable carries all the current to the torch via the same conductor the
gas passes through.
How on earth can this fairly thin shielded cable handle all the
current? What am I missing here? Just curiousity at work....
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Posted by Brent on May 12, 2007, 9:54 pm
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> I had occasion today to open up my water & gas connections on my 300
> amp Miller Syncrowave Tig machine. It appears to me that a shielded
> cable carries all the current to the torch via the same conductor the
> gas passes through.
>
> How on earth can this fairly thin shielded cable handle all the
> current? What am I missing here? Just curiousity at work....
I think You're confusing copper used to Sink power with copper used to
pass power
In a motor or speaker the copper has to absorb the heat of the power
being fed to it times whatever the efficiency of the motor or speaker
might be Say a 2 HP motor is 80% efficient 2 HP is 1500 watts 80
percent of that is 1200. The remaining 300 is made into heat in the
motor and has to be absorbed and or vented away. the arc at the end is
the load where all the heat goes in a welder
IF you look at a welder from the welding cables to the arc its
extremely efficient at passing power through the copper to the arc so
the cabled have almost NO heating loss within them and essentially all
the power goes to the arc. The welder is less efficient getting power
form the mains to the welding cable connections but youre just looking
at the torch cables so we will ignore the welding machine for now
I could put a DMM onto the tig torch to add numbers to this but the
thing to remember is that the current is only being passed through it
and not used in the welding cables
Brent
Ottawa Canada
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Posted by Dan on May 12, 2007, 10:56 pm
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>> I had occasion today to open up my water & gas connections on my 300
>> amp Miller Syncrowave Tig machine. It appears to me that a shielded
>> cable carries all the current to the torch via the same conductor the
>> gas passes through.
>>
>> How on earth can this fairly thin shielded cable handle all the
>> current? What am I missing here? Just curiousity at work....
>
>
>I think You're confusing copper used to Sink power with copper used to
>pass power
>
>In a motor or speaker the copper has to absorb the heat of the power
>being fed to it times whatever the efficiency of the motor or speaker
>might be Say a 2 HP motor is 80% efficient 2 HP is 1500 watts 80
>percent of that is 1200. The remaining 300 is made into heat in the
>motor and has to be absorbed and or vented away. the arc at the end is
>the load where all the heat goes in a welder
>
>
>IF you look at a welder from the welding cables to the arc its
>extremely efficient at passing power through the copper to the arc so
>the cabled have almost NO heating loss within them and essentially all
>the power goes to the arc. The welder is less efficient getting power
>form the mains to the welding cable connections but youre just looking
>at the torch cables so we will ignore the welding machine for now
>
>I could put a DMM onto the tig torch to add numbers to this but the
>thing to remember is that the current is only being passed through it
>and not used in the welding cables
>
>
>Brent
>Ottawa Canada
Thanks Brent, that makes sense.
Dan
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Posted by Ignoramus6369 on May 12, 2007, 10:45 pm
Please log in for more thread options > I had occasion today to open up my water & gas connections on my 300
> amp Miller Syncrowave Tig machine. It appears to me that a shielded
> cable carries all the current to the torch via the same conductor the
> gas passes through.
should be water. not gas.
i
> How on earth can this fairly thin shielded cable handle all the
> current? What am I missing here? Just curiousity at work....
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Posted by Phil on May 12, 2007, 11:30 pm
Please log in for more thread options I think you are talking about the water cooled cable on your Torch , I have
had a very brief interruption in the water flow on my torch and that 1/8 in.
or so copper conductor will be destroyed very quickly , a HW 20 torch can
carry much more amperage than the 250 that is recommended if the water is
very cold and flowing sufficiently , I like to keep a flow sensor in-line
just in case the water flow does go low or stops , have also found that the
torch cools better if the water flows to the torch via the plastic only line
and returns via the power cable line , I do use a Gas cooled torch for
aircraft and other light welding , the gas offers enough heat dissipation to
handle the small stuff , also you may want to make sure that you use clean
or distilled water as opposed to well water as the minerals etc. can clog
and corrode your torch and cable .Good Luck ,Phil
>I had occasion today to open up my water & gas connections on my 300
> amp Miller Syncrowave Tig machine. It appears to me that a shielded
> cable carries all the current to the torch via the same conductor the
> gas passes through.
>
> How on earth can this fairly thin shielded cable handle all the
> current? What am I missing here? Just curiousity at work....
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> amp Miller Syncrowave Tig machine. It appears to me that a shielded
> cable carries all the current to the torch via the same conductor the
> gas passes through.
>
> How on earth can this fairly thin shielded cable handle all the
> current? What am I missing here? Just curiousity at work....