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castkarthick
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Current Conductive Fluid

12/27/2011 1:22 AM

Hi,

i am looking for a liquid that should conduct elec current abt 450amps. we are going to implement a roll-mount in our welding machine. it is used to do resistance welding.

the roll mount is made up of copper and inside it a shaft is rotating both the same mtl. in the cavity we fill the liquid. the current will flow from the roll mount body to shaft thru the liquid. this is wht we are looking.

so the liq should not dry-off. not hazardous, environ harmless.

one of our UK branch using mercury, its hazar but still they are using(no way). i tried to find a silver filled silicone grease and graphite grease too. but our people saying grease wont conduct good. its a semi solid, bla bla bla....

i am searching for liquid graphite too. can anybody help me in this to find any good conductor for our purpose????
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lyn
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#1

Re: Current conductive fluid

12/27/2011 3:22 AM

Stick with mercury, or gallium. No powder filled liquid I know of can carry that much current.
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castkarthick
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#2
In reply to #1

Re: Current conductive fluid

12/27/2011 3:40 AM

gallium is it a liquid???
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lyn
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#3
In reply to #2

Re: Current conductive fluid

12/27/2011 3:42 AM

Do you honestly think I'm sitting here just waiting to do your work for you?

Find our for yourself.

Put forth enough effort to type gallium into a search engine. Or, go ask your mother to do it for you.
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castkarthick
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#4
In reply to #3

Re: Current conductive fluid

12/27/2011 3:47 AM

do not talk rubbish Mr. Lyn....

i know wht to ask to my mom....u no need to teach me...

talk like a professional...

i searched and found something already but thought u may know something more... but realised that u dont know anything... just showing like u are genius....
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lyn
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#5
In reply to #4

Re: Current conductive fluid

12/27/2011 3:50 AM

How to Search the Internet
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castkarthick
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#6
In reply to #5

Re: Current conductive fluid

12/27/2011 3:53 AM

i know ..............
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Wal
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#16
In reply to #4

Re: Current conductive fluid

12/27/2011 10:53 PM

talk like a professional...

I suppose that you are demonstrating some professionalism here.

Of course you are......

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castkarthick
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#19
In reply to #16

Re: Current conductive fluid

12/27/2011 10:59 PM

yesssss sirr
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Nah
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#8
In reply to #3

Re: Current conductive fluid

12/27/2011 10:34 AM

Lyn "switched frames."

The framing of this and many forums is supposed to be "adult to adult" but Lyn now comes across as a parent scolding a child. Eric Berne discussed this in his book Games People Play but he didn't use the word framing. Deborah Tannen also addresses this issue.

Speaking of the Internet, you may want to search for "frame it and claim it".
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lyn
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#9
In reply to #8

Re: Current conductive fluid

12/27/2011 11:51 AM

Please feel free to answer any questions posed here. That may be more productive.

Of course you are also free to criticize anyone you feel has offended you, too.

You will note that I answered the OP's original question.
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Nah
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#10
In reply to #9

Re: Current conductive fluid

12/27/2011 1:13 PM

Are you purposely misunderstanding the content and meaning of my reply?

BTW, interpreting someone's behavior back to them is called "process commentary."
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JRaef
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#11
In reply to #10

Re: Current conductive fluid

12/27/2011 1:44 PM

Methinks this tangent is now far afield of the original ELECTRICAL ENGINEERING purpose of the thread. Lyn's initial response, however curt, was accurate. The fact that the OP then followed up with an inane question that could have been determined with even a small modicum of effort was perhaps deserving of the derision that Lyn spewed, but decorum should have otherwise been observed. However, I too have my moments of frustration when we try to help someone who then seems reluctant to take any further initiative.

So have some respect Nah, I think we all hold out tongues a lot more than we might in light of the inanity of some of the questions, but we can't be expected to be perfect.

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castkarthick
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#13
In reply to #11

Re: Current conductive fluid

12/27/2011 8:16 PM

Dont talk unknowingly Mr. Raef...i already found something about wht he Mr. Lyn said. but i dont have time to get more info from net. thats why i thought as a experienced person he knows much than me and asked. but u saw how he replied.

not like an educated and experienced and professional...
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Tornado
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#14
In reply to #13

Re: Current conductive fluid

12/27/2011 10:41 PM

How dare you ever criticize someone else's alleged lack of professionalism?

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castkarthick
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#17
In reply to #14

Re: Current conductive fluid

12/27/2011 10:56 PM

because his speech was like that,,, why unwantedly he said"" ask you mother to find??"" it is not a good professionals act....Mr. Torn..
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#20
In reply to #17

Re: Current conductive fluid

12/27/2011 11:15 PM

Lyn suggested gallium, which is liquid above about 90°F or so. You could have searched on it and confirmed for yourself. Instead, you asked the inane question, "Is it liquid?"

For you to whine about someone else's lack of professionalism is just plumb ridiculous. Insinuating that JRaef is less than knowledgeable is beyond ridiculous.

But never fear; your fellow idiot "Nah" will back you up.

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castkarthick
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#21
In reply to #20

Re: Current conductive fluid

12/27/2011 11:40 PM

oh really thanks...
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brich
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#29
In reply to #11

Re: Current conductive fluid

12/28/2011 5:21 AM

Sorry JR.. gotta disagree, I don't think Lyn's first response was curt, just direct & to the point.... no BS!

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JRaef
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#35
In reply to #29

Re: Current conductive fluid

12/28/2011 10:38 AM

Sorry JR.. gotta disagree, I don't think Lyn's first response was curt, just direct & to the point.... no BS!

Oops, I think you are right. I've always used "curt" as synonymous to "terse", I had no idea the primary definition included the term "rude". Didn't really intend on that interpretation. I meant terse, direct, to the point but as short as possible, which is listed as a secondary definition. Sorry Lyn.

Now I'm left wondering how many times in the past I have used that word and inadvertently insulted people. <hangs head>

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lyn
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#36
In reply to #35

Re: Current conductive fluid

12/28/2011 11:13 AM

No offense taken. I sometimes speak when silence would be the better path.

Cheers
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Tornado
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#12
In reply to #10

Re: Current conductive fluid

12/27/2011 7:34 PM

And just who it who has engaged in that activity here?

Thanks a heap for your amateur psychology.

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PWSlack
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#42
In reply to #10

Re: Current conductive fluid

12/29/2011 3:43 PM

Do feel free to tell anyone who is interested.

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Wal
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#15
In reply to #8

Re: Current conductive fluid

12/27/2011 10:48 PM

What frame switch?

Frame in #1 mentor proposing good advice and a solution

Frame in #3 mentor admonishing disciple for being slack

The frame is identical both times. The messages and their purposes are different.

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Andy Germany
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#31
In reply to #3

Re: Current conductive fluid

12/28/2011 8:02 AM

LOL!!

Well put!!

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PFR
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#32
In reply to #31

Re: Current conductive fluid

12/28/2011 8:35 AM

On a lighter note, don't some windmills use a slip ring configuration to move a good bit of DC Amps? Since the OP did not give RPM's, this could be an unsuitable solution, but it also reminds me of subway cars, etc. Lyn, I believe you enjoy debate, as do I. I suggest you let those posts that annoy you lie. We who read your posts enjoy your depth of knowledge and willingness to share, but not the denigration, however much deserved.

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TonyS
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#7

Re: Current Conductive Fluid

12/27/2011 7:36 AM

So much for the season of good will to all men.

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iyerkumar
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#18

Re: Current Conductive Fluid

12/27/2011 10:56 PM

I actually read the thread and agree with Lyn..

As soon as I read his response, I had the same curiosity about gallium being liquid, and went onto another tab to check if its a liquid at RT.

I am surprised at the number of posts where folks do not have the urge to get their questions answered through their own research and leave it to others to answer..

thanks and have a great holidays..
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castkarthick
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#22
In reply to #18

Re: Current Conductive Fluid

12/27/2011 11:42 PM

CR4 ADMIN: Deleted Post

Abuse/Attack: This post was deleted because it was an attack on another user. Please review the CR4 Site FAQ and the CR4 Rules of Conduct.
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Tornado
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#24
In reply to #22

Re: Current Conductive Fluid

12/28/2011 3:30 AM

CR4 ADMIN: Deleted Post

Vulgar/Rude/Improper Behavior: This post was deleted because it did not adhere to the behavioral policies of the site. Please review Section 14 of the CR4 Site FAQ and the CR4 Rules of Conduct.

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castkarthick
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#25
In reply to #24

Re: Current Conductive Fluid

12/28/2011 4:18 AM

what is this??? couldn't understand sir...
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kvsridhar
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#23

Re: Current Conductive Fluid

12/28/2011 3:12 AM

Tsk tsk castkarthick

You wanted some information. You got Gallium as a possible alternative. You could have stopped there and done some research on your own...

Instead, you turned this into a pissing contest, burning your bridges, antagonising acknowledged experts who might have been of immense help to you in your future learning. Pity, none of them will help you in future.

Coming from a country which equates a teacher to God (), i take all that i learn, no matter how small, with humility and gratitude. i wish you become a little mellow and appreciate any learning. And the teacher.

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castkarthick
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#27
In reply to #23

Re: Current Conductive Fluid

12/28/2011 4:22 AM

Sorry for the happenings sridhar...

he used to talk abt my mom.. thats y got little tensed and.....
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castkarthick
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#26

Re: Current Conductive Fluid

12/28/2011 4:20 AM

Thanks for your link Mr. Wal..

i will check on this..
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brich
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#28

Re: Current Conductive Fluid

12/28/2011 5:18 AM

Well, the season of good will I guess disappeared the minute the post Christmas sales started.

You do yourself no favours by typing in "text speak"... when you, to me, seem to have a total grasp of the english language. You have NO IDEA how bloody annoying it is to read your OP and subsequence posts. Professional you say?

Do you vocalise like that? Na! So why type like it?

Second, over the years I have been here on CR4, many have asked questions that can only be called "suspect". In that I mean, it brings their education and IQ level into question.

With that said, I consistently quote two phrases my father taught me...

1. Open it and prove it, or keep it shut and let them think it

2. There is no such thing as a stupid question, it is only stupid not to ask

However the use of those two phases comes with experience, of which after reading your posts, the way you type and the questions you ask, leaves me wondering which one will fit, if not both of them. The latter seems to be the case.

Your question, "gallium is it a liquid???" proves to one and all you are not capable of finding out what gallium is, capable of NOT understanding the answer and certainly NOT understanding your question. How did you find CR4?

Yes I now hear you ask what about point 2. There is no such thing as a stupid question, however there are dumb questions that prove your worth.

Lyn answered your question, which was, "i am searching for liquid graphite too. can anybody help me in this to find any good conductor for our purpose????"

So NOW do you see why you got the response you did?

Oh by the way, Happy New Year!

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lyn
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#30

Re: Current Conductive Fluid

12/28/2011 7:19 AM

Why don't we just let it die. My response was not friendly. The reaction was not well reasoned.

Let's move on, thanks.
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JE in Chicago
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#33

Re: Current Conductive Fluid

12/28/2011 9:01 AM

The first reasonable thing I've read.. water is a liquid too... Except when it's gas or solid

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welderman
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#34

Re: Current Conductive Fluid

12/28/2011 9:04 AM

You asked this question on 10/9/11 and received many good answers including the methods industry currently uses to deal with this problem. Were you not satisfied? Silver brushes and castor oil, or low melting alloys seem to be state-of-the-art technologies
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iyerkumar
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#37

Re: Current Conductive Fluid: Galinstan??

12/28/2011 12:12 PM

I looked up alternative to mercury in thermometer and came across Galinstan:

http://en.wikipedia.org/wiki/Galinstan

Electrical conductivity is higher than mercury (Electrical conductivity: 3.46x106 S/m (at 20 °C)[2]

vs. 1.02 x 10^6)

Its an alloy of Gallium, Indium and Tin. Can this be used, presuming its cheap in large quantities?

--Iyer
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castkarthick
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#40
In reply to #37

Re: Current Conductive Fluid: Galinstan??

12/28/2011 9:21 PM

thanks Kumar..

i will look on this..
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castkarthick
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#44
In reply to #37

Re: Current Conductive Fluid: Galinstan??

12/30/2011 4:20 AM

I checked everything abt this mtl galinstan. looks good. but the only issue is it corrode the contact mtl. my roll mount and shaft mtl is copper and brass. i am searching on this issue with some suppliers..
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brich
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#45
In reply to #44

Re: Current Conductive Fluid: Galinstan??

12/30/2011 7:04 AM

do you know to to spell full words?

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#38

Re: Current Conductive Fluid

12/28/2011 3:17 PM

Gallium is a little bit expensive with near 500 to 1000$/Kg.

In contact with metals it will (maybe or not) alloy with these and then be useless.

You will also need another "unknown stuff" to prevent the liquid from creeping away.

Sliprings may be an alternative and can carry large amounts of current.

The oven used for centrifugal casting of big astronomical mirrors in Tucson has near 13MW! conducted over sliprings.

So may be "liquid" is not necessary.

RHABE
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castkarthick
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#41
In reply to #38

Re: Current Conductive Fluid

12/28/2011 9:24 PM

you are right rhabe,, but the prob is here in our design we cant fix a slipring. we should use a conductive fluid only. anyway thanks for your time.
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#39

Re: Current Conductive Fluid

12/28/2011 9:03 PM

It becomes weary trying to help someone who doesn't appear to want to help himself. A simple Google search under "gallium alloy slip ring" will yield reams of data. In case you don't have access to Google, try http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA201304 By the way, the alloy you want is 66.5%Ga,20.5%In,13%Sn. And please don't continue to ask the same question every two months.
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#43

Re: Current Conductive Fluid

12/29/2011 3:46 PM

Try seawater.

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Andy Germany (1); brich (3); castkarthick (14); iyerkumar (2); JE in Chicago (1); JRaef (2); kvsridhar (1); lyn (6); Nah (2); PFR (1); PWSlack (2); RHABE (1); TonyS (1); Tornado (4); Wal (2); welderman (2)

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