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Electrodes Rods
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 200 Amp Tweco Style Electrode Holder Welding Rod holder  US $11.99
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 BRAND NEW Tungsten Electrode Rods US $8.99
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 e4043 ALUMINUM WELDING ELECTRODES 5 LB -1/8" RODS US $40.00
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 Cast Iron Repair Stick Electrode 3/32"x12" Rod Nickel99 Ni99 ENi-C1, 5pcs US $9.99
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 ROD GUARD WELDING ELECTRODE ROD STORAGE 14" NEW US $12.75
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 TILLMAN 525 LEATHER ROD / ELECTRODE HOLDER US $7.99
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 LINCOLN LH7018AC WELDING ELECTRODE ROD 3/32" 5# BX US $21.80
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 Welding electrodes rod 316L 1/8" X 10# US $49.00
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 Welding electrodes rod 316L 5/32" X 10# US $48.00
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 Welding electrodes rod 309L 5/32" X 10# US $45.00
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 Welding electrodes rod 308L 3/32" X 7# US $30.00
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 Welding electrodes rod 308L 1/8" X 10# US $39.00
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 Welding electrodes rod 316L 3/32" X 7# US $37.00
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 Welding electrodes rod 308L 5/32" X 10# US $38.00
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 20 Saturn Precision Brass Rod Electrode .0385 X 12 US $99.95
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 6013 1/16 Welding Electrode Rod 4lbs Tube 12" 110 Stick welder US $19.95
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 KT Stainless Steel Welding Rods 308-16 Electrodes 1/8" US $8.99
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Here are some more information for Electrodes Rods:
Finding the difference between reverse and straight polarity
When you see the letters AC/DC on your welder, do you think of one of your favorite rock and roll bands? Seriously though, the difference is quite important to the final quality of your welds.
AC (Alternating Current) and DC (Direct Current) is used to describe the polarity of the electric current that the welder generates and in what direction it travels. If you use the wrong polarity for a certain welding rod, your weld strength will not be very good.
The general terms associated with polarity are reverse polarity and straight polarity. These are common to the welding trade. Another way to describe the two terms are electrode positive and electrode negative. Electrode positive is the same as reverse polarity. Electrode negative is the same as straight polarity. Hence the + and the - written on your welder where the cables connect to it.
Any type of welding rod you buy will be labeled as to what polarity should be used for welding with it. Using the correct polarity will ensure the proper penetration and the over all look of the final bead.
If you use the wrong polarity you can tell by the signs. There will be an excessive amount of spatter, you will have bad penetration, and you will have less control of your arc.
Some welding machines have a switch to adjust the polarity. If your welder doesn't have one you will need to switch the welding cables around where they plug into the machine. If you want reverse polarity, you need to make sure the electrode holder is plugged into the + terminal.
The easiest way to tell if you are using the wrong polarity is by the sound and the feel of the weld you are laying down. If you don’t have much experience with stick welding you will have a little more trouble determining the difference. I have seen guys weld all day long with the wrong polarity. Then I would grab their welder to use for couple of minutes and I could tell right away. It all comes down to experience.
If you don’t have much experience stick welding, you will need to double check the way the machine is set up. Follow what the welding rod package tells you to do and do it. If you are using 7018 rods, you will want to make sure it is set up for reverse polarity.
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cu2+ / cu and fe3+ / fe2+ half cells?
hey,
according to the electrochemical series, the copper electrode should be negative, right?
but in my experiment, i got it positive and the carbon rod for iron ions is positive?
am i wrong????
note that the concentraion used is 0.1 M not the standard 1 M (for electrochemical series)
Dr Dave P, thanx r ur reply but in the experiment iam using 0.1 M of solutions and the electrochemical series is standard for 1 M of solution, any effect in that?
Fe+3 + e- <--> Fe+2 Eº = + 0.77V
Cu+2 + 2e- <--> Cuº Eº = +0.34V
ref: http://www.chemguide.co.uk/physical/redoxeqia/ecs.html
So to make this cell work we need this:
Cuº <--> Cu+2 + 2e- Eº = -0.34V
2Fe+3 + 2e- <--> 2Fe+2 Eº= 1.44V
Cuº + 2Fe+3 <--> Cu+2 + 2Fe+2 Ecell = +1.1 V
The copper electrode should be negative and be the anode (oxidation happens at the anode). The other electrode (carbon?) should be positive and be the cathode.
Edit: The concentration shouldn't make any difference in the potential.
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