ISO 14174:2019 pdf free.Welding consumables一Fluxes for submerged arc welding and electroslag welding一Classification.
5 Symbols
5.1 Symbol for the product/process
The symbol for the flux used in submerged arc welding for joining and overlay welding shall be the letter S and for the flux used in electroslag welding for joining and overlay welding shall be the letters ES.
5.2 Symbol for method of manufacture
The symbol below indicates the method of manufacture:
— F: fused flux;
— A: agglomerated flux;
— M: mixed flux.
Fused fluxes are made by melting and granulating. Agglomerated fluxes are bound, granular mixtures of finer raw materials. Mixed fluxes comprise all fluxes which, after fusing or agglomerating, are mixed with one or more additional components or fluxes.
For particle size requirements in marking, see Clause 6.
5.3 Symbol for type of flux, characteristic chemical constituents
The symbols in Table 1 indicate the type of flux in accordance with the characteristic chemical constituents. Elemental analysis shall be performed on representative samples of the flux. Any suitable analytical technique may be used, but in cases of dispute reference shall be made to established methods. Based on the elemental analysis of the flux, the characteristic chemical constituents of the flux can be determined.
Examples of such determinations are shown in Annex A and descriptions of flux types are given in Annex B.
5.4 Symbol for applications, flux class
5.4.1 General
A given flux may carry more than one class as specified in 5.4.2 to 5.4.5.
5.4.2 Flux class 1
These are fluxes for submerged arc welding of non-alloy and fine grain steels, high-strength steels, creep-resisting steels, and atmospheric corrosion-resisting steels.
In general, the fluxes do not contain alloying elements, other than Mn and Si, thus the weld metal analysis is predominantly influenced by the composition of the wire/strip electrode and metallurgical reactions. The fluxes are suitable for joint welding and/or overlay welding. In the case of joint welding, some fluxes can be applied for both multi-run and single-run and/or two-run technique.
In the flux designation, the digit 1 indicates class 1.
5.4.3 Flux classes 2 and 2B
These are fluxes for joint welding of stainless and heat-resisting steels and/or nickel and nickel alloys and corrosion-resistant overlay welding’). Fluxes of these classes can contain alloying elements compensating for the burn-out (elements lost to the slag).
In the flux designation, the digit 2 is used to indicate class 2 fluxes mainly suited for joint welding, but which can also be used for strip cladding. 2B is used for fluxes especially designed for strip cladding.
5.4.4 Flux class 3
These are fluxes mainly for hard-facing overlay welding by transfer of alloying elements from the flux, such as C, Cr or Mo.
In the flux designation, the digit 3 indicates class 3.
5.4.5 Flux class 4
These are other fluxes for which classes 1 to 3 are not applicable, e.g. fluxes for copper alloys.
In the flux designation, the digit 4 indicates class 4.
5.5 Symbol for metallurgical behaviour
5.5.1 General
The metallurgical behaviour of a flux is characterized by the contribution (pick-up and/or burn-out) of
alloying elements. Concerning fluxes for joining, the contribution is the difference between the chemical composition of the all-weld metal deposit and the composition of the specified electrode. Concerning fluxes for overlay welding, the contribution is the difference between the chemical composition of the deposited weld metal of the last bead/layer and the chemical composition of the specified wire/strip electrode.
5.5.2 Metallurgical behaviour, flux class 1
For determining the pick-up and burn-out behaviour, a wire electrode ISO 14171-A – S2 or ISO 14171-B -SU22 shall be used in accordance with 5.5.6. The pick-up or burn-out of the elements Si and Mn shall be stated in this sequence.
The symbols in Table 2 indicate the metallurgical behaviour of a welding flux class 1.ISO 14174 pdf download.