BS EN ISO 17672:2016 pdf free.Brazing – Filler metals.
This International Standard specifies the compositional ranges of a series of filler metals used for brazing. The filler metals are divided into seven classes, related to their composition, but not necessarily to the major element present.
NOTE 1 For the major element(s)present, see Annex A.
In the case of composite products, such as flux-coated rods, pastes or plastics tapes, this International Standard covers only the filler metal that forms parts of such products. The melting temperatures given in the tables are only approximate, as they necessarily vary within the compositional range of the filler metal. Therefore, they are given only for information. Technical delivery conditions are given for brazing filler metals and products containing brazing filler metals with other constituents such as flux and/or binders.
NOTE 2 For some applications, e.g. precious metal jewellery, aerospace and dental, filler metals other than those included in this International Standard are often used and these are covered by other International Standards to which reference can be made.
3 Composition
The filler metal shall have a composition in accordance with Tables 5 to 13 for the particular type, except as modified for special vacuum requirements (see Clause 4 and Table 1)
If the values for an element range from 0 (—) to a defined value, the element may be, but does not have to be, in that brazing filler metal.
For the purposes of determining compliance with composition limits, any value obtained from the analysis shall be rounded to the same number of decimal places as used in this International Standard in expressing the specified limit. The following rules shall be used for rounding.
a)When the figure immediately after the last figure to be retained is less than five, then the last figure to be retained shall be kept unchanged.
b) When the figure immediately after the last figure to be retained is either
1)greater than five, or
2)equal to five and followed by at least one figure other than zero,the last figure to be retained shall be increased by one.BS EN ISO 17672:2016 pdf free.