We hear welders referring to electrodes with numbers such as E 6013 or E7018 electrodes. What is the signification of these numbers?
The numbers referred to is a system of classification of MMAW electrodes for Carbon Steel Covered Arc Welding Electrodes under the American Welding Society (AWS 5.1). We will try and give a short explanation as to what the numbers signify. It may be noted that different countries have their own system of electrode designation and the numbers may have different meanings for different specifications. However, by far the most universally accepted Electrode specification is the AWS specification. The American coding system starts with the prefix E, which designates an electrode. Then comes a two digit number 60 or 70. This number 60 designates tensile strength of at least 60 ksi of the weld deposit. 60ksi means 60,000 psi (lbs/sq in). Similarly, 70 means minimum weld metal tensile strength of 70 ksi or 70,000 psi. the actual stipulated minimum tensile strength values and the associated yield strength values vary according to the type of covering as shown below. The third digit indicates th
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