Approximately 2/3rds of the heat is generated at the positive anode, due to the impingement of high speed, high energy electrons. In TIG welding, the split of heat between the anode and cathode is significant. DCEP was also historically known as Direct Current Reverse Polarity (DCRP) or simply "Reverse", whereas DCEN was also known as Direct Current Straight Polarity (DCSP) or simply "Straight". This results in either Direct Current Electrode Positive (DCEP) or Direct Current Electrode Negative (DCEN). When the welding process is performed in DC mode, the electrode (either MMA electrode, MIG/MAG/flux- or metal-cored wire or tungsten electrode), can be either positive or negative. A useful mnemonic for this is PANiC (Positive Anode, Negative Cathode). The part of the welding circuit that is negative (produces electrons in the arc) is the cathode. The part of the welding circuit that is positive (attracts electrons in the arc) is the anode. It is necessary to define terms to specify the polarity of the welding process. Click here to see our latest technical engineering podcasts on YouTube. A welding procedure should specify the polarity for each weld run. The choice of polarity also depends on the type of the material, welding position and joint design.
#CATHODE NEGATIVE OR POSITIVE ISO#
Electrode manufacturer information and specifications such as BS EN ISO 2560:2009 and AWS A5.1-2012, define the polarity with which different coated electrodes may be used. The first important point is that not all MMA electrodes can be used with all polarities. National Structural Integrity Research Centre.Structural Integrity Research Foundation.
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