What is this standard about?
BS EN ISO 17634 is an international welding standard, providing a classification system for specific covered electrodes.
Who is this standard for?
- Suppliers, users, manufacturers, testers of covered electrodes
- The construction, structural engineering and building industries
- Manufacturing industries, oil and gas, energy, chemical plants
- Shipbuilding industry
Why should you use this standard?
This standard specifies requirements for classification of covered electrodes, based on the all-weld metal in the heat-treated condition, for manual metal arc welding of ferritic and martensitic creep-resisting and low alloy elevated temperature steels.
This is a combined specification for classification. It uses either a system based on the chemical composition of the all-weld metal, with requirements for the yield strength and impact energy. Or alternatively it uses a system based on the tensile strength and the chemical composition of the all-weld metal.
What’s changed since the last update?
This fourth edition replaces the third 2010 edition — it has been systematically reviewed by experts, to take into consideration recent material, technological and industry developments. Changes include:
- New classifications from the USA and Japan have been added in system B
- Revisions/corrections of chemical compositions and other values have been made in the tables
- Footnote to Table 1 - revised to clarify that elements intentionally added, that do not have values listed (including Co and B), are to be reported
- Descriptions in Table 3 have been revised
- The range for nominal electrode efficiency for symbol 4 in Table 4 has been corrected