BS EN 756-2004 pdf download.Welding consumables— Solid wires, solid wire-flux and tubular cored electrode-flux combinations for submerged arc welding of non alloy and fine grain steels — Classification.
This BS EN 756 specifies requirements for classification of electrode-flux combinations and all-weld metal in the as-welded condition for submerged arc welding of non alloy and tine grain steels with a minimum yield strength of up to 500 MPa. Classification can be made with solid wire electrodes or tubular cored electrodes. One flux may be classified with different electrodes. The solid wire electrode is also classified separately based on its chemical composition. Fluxes for the single and two wn techniques are classified on the basis of the two run technique.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to European Standards only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
EN ISO 544, Welding consumables — Technical delivery conditions for welding filler materials — Type of product, dimensions, tolerances and markings (ISO 544:2003).
EN 760, Welding consumables — Fluxes for submerged arc welding — Classification.
EN 1597-1, Welding consumables – Test methods – Part 1: Test piece for all-weld metal test specimens in steel, nickel and nickel alloys.
EN 1597-2, Welding consumables – Test methods – Part 2: Preparation of test piece for single-run and two-run technique test specimens in steeL
EN ISO 6847, Welding consumables. Deposition of a weld metal pad for chemical analysis (ISO 6847:2000).
EN ISO 13916, Welding — Guidance on the measurement of preheating temperature. interpass temperature and preheat maintenance temperature (ISO 13916:1996).
ISO 31-0:1992, Quantities and units — Part 0: General principles.
3 Classification
The classification includes all-weld metal properties obtained with a manufacturers specific electrode-flux combination as given below. A solid wire electrode may be separately classified with the symbol for its chemical composition in Table 5.
The classification is divided into five parts:
1) The first part gives a symbol indicating the process to be identified.
combination as given below. A solid wire electrode may be separately classified with the symbol for its chemical composition in Table 5.
The classification is divided into five paris:
1) The first part gives a symbol indicating the process to be identified.
2) The second part gives a symbol indicating strength and elongation of all-weld metal for multi wn technique or the strength of the parent material used in classification for the two run technique.
3) The third part gives a symbol indicating impact properties of the all-weld metal or the two run welded joint.
4) The fourth part gives a symbol indicating the type of flux used.
5) The fifth part gives a symbol indicating the chemical composition of the solid wire electrode used or the
chemical composition of the all-weld metal deposited by a tubular cored electrode-flux combination.
4 Symbols and requirements
4.1 Symbol for the process
The symbol for a solid wire electrode and/or an electrode-flux combination used in the submerged arc welding
process shall be the letter S.
4.2 Symbol for the tensile properties
4.2.1 MultI run technIque
The symbol in Table 1 indicates yield strength, tensile strength and elongation of the all-weld metal in the as- welded condition determined in accordance with 5.1.
5.2 Two run technique
Tensile and impact tests and any required retests shall be carried out on weld metal in the as-welded condition using a test assembly type 4 according to EN 1597-2. Welding conditions shall be within the range recommended by the manufacturer and shall be recorded to demonstrate compliance with this standard.
6 Chemical analysis
Chemical analysis shall be performed on specimens of the solid wire electrode or on any suitable all-weld metal test specimen deposited by the electrode-flux combination. In case of dispute specimens in accordance with EN ISO 6847 shall be used. Any analytical technique can be used, but in case of dispute reference shall be made to established published methods.
NOTE See Bibliography.
7 Technical delivery conditions
Technical delivery conditions shall meet the requirements in EN ISO 544.
8 Designation
The designation of the solid wire electrode and the electrode-flux combination shall follow the principle given in the examples below:
EXAMPLE 1 A wire-flux combination for submerged arc welding for multi run technique deposits a weld metal with a minimum yield strength of 460 MPa (46) and a minimum average impact energy of 47 J at -30°C (3) produced wth an aluminatebasic flux (AB) and a solid wire electrode S2 is designated:BS EN 756-2004 pdf download.