The testing and acceptance of tungsten electrode has a mature standard system, represented by ISO 6848 and AWS A5.12 internationally, and GB/T 38713 in China. These standards cover the classification, composition, performance indicators, color identification, dimensional tolerances and usage suggestions of tungsten electrodes, and are the technical basis for evaluating the quality of tungsten electrodes.
1.International Standards (iso)
ISO 6848:2015
<Non-melting electrodes for welding – tungsten and tungsten alloys>
This is one of the most widely used international standards and specifies the following:
Classification of tungsten electrodes (e.g., thorium tungsten, cerium tungsten, lanthanum tungsten, etc.)
Chemical composition requirements (percentage content of alloying elements in various electrodes)
Color code identification
Electrode physical properties and size range
Recommended Usage (AC Soldering/DC Soldering)
2.American Standards (aws)
AWS A5.12 / A5.12M
Specification for Tungsten and Tungsten Alloy Welding Electrodes
Published by the American Welding Society (AWS), it includes:
The range of alloy composition of various types of electrodes
Cutting-edge color identification standard
Size and allowable tolerances of the electrode
Description of welding properties and recommended applications
This standard is basically equivalent to ISO 6848, with slightly different terminology and parameters, but is most commonly used in the Americas.
3.Chinese National Standard (GB/T)
GB/T 38713-2020
Tungsten and tungsten alloy welding electrodes
It is a Chinese national standard, which is basically equivalent to ISO 6848, which regulates the following aspects:
Model naming convention for electrodes (e.g. WP, WT20, WC20, WL15, etc.)
Chemical composition index
Color coding system
Surface quality and dimensional margin of error
Product batch consistency requirements
4.Standards for testing and testing (matching use)
GB/T 13298-2015 (General Principles of Metallographic Inspection)
GB/T 228-2021 (Tensile test method for metallic materials)
GB/T 4340.1-2009 (Microhardness test)
GB/T 16555-2015 (Resistivity measurement method)
ISO 6507/6508 (International Standard for Micro/Rockwell Hardness)
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