ISO 21952-2012 pdf download.Welding consumables – Wire electrodes,wires, rods and deposits for gas shielded arc welding of creep-resisting steels – Classification.
ISO 21952 specifies requirements for dassification of wire electrodes, wires and rods for gas shielded metal arc welding and tungsten inert-gas welding of creep-resisting steels, and for their deposits in the as-welded or post-weld heat-treated condition. One wire electrode can be tested and classified with different shielding gases.
This International Standard is a combined specification providing for classification utilizing a system based upon the chemical composition of wire electrodes, wires and rods with requirements for yield strength and average impact energy of 47 J of all-weld metal, or utilizing a system based upon the tensile strength of the all-weld metal deposits and the chemical composition of wire electrodes, wires and rods.
a) Clauses, subclauses and tables which carry the suffix letter A” are applicable only to wire electrodes, wires, rods and deposits classified in accordance with the system based upon the chemical composition with requirements for yield strength and the average impact energy of 47 J of all-weld metal deposits under this International Standard.
b) Clauses, subclauses and tables which carry the suffix letter B” are applicable only to wire electrodes, wires, rods and deposits classified in accordance with the system based upon the tensile strength of all-weld metal deposits and the chemical composition of wire electrodes, wires and rods under this International Standard.
c) Clauses, subclauses and tables which do not have either the suffix letter A or the suffix letter are applicable to all wire electrodes, wires, rods and deposits classified under this International Standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition or the referenced document (including any amendments) applies.
ISO 544, Welding consumables — Technical delivery conditions for filler materials and fluxes — Type of product, dimensions, tolerances and markings
ISO 13916, Welding — Guidance an the measurement of preheating temperature, interpass temperature and preheat maintenance temperature
ISO 14175:2008, Welding consumables — Gases and gas mixtures for fusion welding and allied processes ISO 14344, Welding consumables — Procurement of filler materials and fluxes
ISO 15792-1. Welding consumables — Test methods — Part 1: Test methods for all-weld metal test specimens in steel, nickel and nickel alloys
ISO 80000-1:2009, Quantities and units — Part 1: General
3 Classification
Classification designations are based upon two approaches to indicate the chemical composition of the wire electrode, wire or rod, and tensile properties and impact properties of the all-weld metal deposits obtained with a given wire electrode, wire or rod. The two designation approaches include additional designators for some other classification requirements, but not all, as is clear from the following subclauses. In most cases, a given commercial product can be classified in accordance with both systems. Then either or both classification designations can be used for the product.
A wire electrode, wire or rod shall be classified in accordance with its chemical composition as given in Table 1.
When the wire electrode, wire, rod or deposit is classified in combination with a shielding gas, the classification shall be prefixed with a symbol in accordance with Clause 4 as appropriate.ISO 21952 pdf download.