Thise electrode is the cathode.
Right Leg-RL
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The dropping mercury electrode
Current is measured in amperes. Amperes is also coulombs per second.
We were told 309 was the electrode of choice.
7018 electrodes should be used with DC positive polarity. This means the electrode holder is connected to the positive terminal of the welding machine, resulting in better arc stability and smoother weld deposits.
6013 is normal arc electrode which is used for light jobs like sheet welding or tank making but when it comes to heavy construction jobs where strength required is more 7018(Low Hydrogen) Arc Electrode is used like boilers, heavy structures etc. Working with 6013 is far easier than 7018, which requires welder's skills. Neatness in finishing is also more with 6013 than 7018. any further info. on construction : nangalsuri@rediffmail.com Surinder Singh
Yes, the electrode holder (stinger) is positive and the ground is negative which means you would be welding DC positive.
The only time I welded corten I used 7018 electrodes. I was told that elements in the corten mixed with the electrode in the weld giving it rust resistant capabilities.
what is the difference between 7018 and 7018-1
any electrode with the first two digits 60 are 60000 psi tensile strength ex a 7018 would have 70000 psi tensile strength
Almost all electrodes have a series of numbers to tell #1 what the tensile strength of the weld will be, #2 what electrical current to use, #3 what position/s it can be used in (ie: flat, vertical etc.) Ex. E - 7018. E = electrode, 70 = 70,000 lbs tensile strength, 1 = all positions, 18 = AC or DC reverse polarity current. (welding lead +)
E7018 is a shielded metal arc welding (SMAW) electrode. 'E' stands for electrode. '70' stands for 70000 psi minimum as welded tensile strength. '1' designates the position the electrode can be welded in, in this case all positions. '8' classifies that the electrode is a low hydrogen electrode and contains a higher amount of iron powder.
Thise electrode is the cathode.
Actually 7018 is a low hydrogen electrode. Some electrodes produce a gas containing hydrogen to protect the molten puddle from oxygen which can destroy the metal. (Oxidization = rust) The 18 series produces very little if any hydrogen. These electrodes must be kept dry as moisture is water (H2O- 2 parts hydrogen one part oxygen).
The angle of the electrode, the speed of the electrode used to weld and the size of the electrode.