1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22257-4 SANS 710:2008Edition 1.1Any reference to SABS 710 is deemedto be a reference to this standard(Government Notice No. 1373 of 8 Nove
4、mber 2002)SOUTH AFRICAN NATIONAL STANDARD Acid-cored solders Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 710:2008 Edition 1.1 Table of changes Change No. Date Scope Amdt 1 2008 Amen
5、ded to change the designation of SABS standards to SANS standards and to update referenced standards. Acknowledgement The SABS Standards Division wishes to acknowledge the valuable assistance derived from publications of the following organizations: American Society for Testing and Materials British
6、 Standards Institution Deutscher Normenausschuss Foreword This South African standard was approved by National Committee SABS TC 1078, Engineering materials Non-ferrous metals, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This doc
7、ument was published in December 2008. This document supersedes SABS 710:1973 (first edition). A vertical line in the margin shows where the text has been technically modified by amendment No 1. SANS 710:2008 Edition 1.1 1 Contents Page Acknowledgement Foreword 1 Scope 3 2 Definitions . 3 3 Requireme
8、nts 3 4 Packing and marking . 6 5 Sampling and compliance with the specification 7 6 Inspection and methods of test 7 6.1 Inspection . 7 6.2 Spreading test 7 6.3 Test for activity . 8 6.4 Test for solubility of flux 9 6.5 Chemical analysis . 10 6.6 Determination of flux content 10 Appendix A Applica
9、ble standards . 12 Appendix B Notes to purchasers . 12 Appendix C Melting characteristics and typical uses of acid-cored solders . 13 Appendix D Measurement of area of melted solder 13 SANS 710:2008 Edition 1.1 2 This page is intentionally left blank SANS 710:2008 Edition 1.1 3 Acid-cored solders 1
10、Scope 1.1 This specification covers soft solders (in the form of wire or ribbon) containing one or more cores of acid flux. NOTE a) The titles of standards referred to by number in the specification are given in appendix A. b) Requirements that must be specified by the purchaser and those that must
11、be agreed upon between supplier and purchaser are listed in appendix B. c) The melting characteristics and typical uses of acid-cored solders are given in appendix C. d) Methods for the measurement of area of melted solder are given in appendix D. 2 Definitions 2.1 For the purposes of this specifica
12、tion the following definitions shall apply: batch reels or coils of cored solder that are made from one melt of solder alloy and that contain flux processed from one charge of raw material defective a reel or coil of cored solder that fails in one or more respects to comply with the relevant require
13、ments of the specification lot all those reels or coils of cored solder of the same grade, nominal size, and batch identification, from one manufacturer, submitted at any one time for inspection and testing 3 Requirements 3.1 Composition of the solder alloy Except as allowed for in terms of the Note
14、 below, the alloy shall be of one of the grades given in table 1, as specified by the purchaser, and its composition, determined in accordance with 6.5, shall comply with the appropriate values given in the table. NOTE Grades of lead-tin solder other than those given in table 1 may be supplied if so
15、 required by the purchaser. For any such grade the tin content shall be within 0,5 % of the value specified by the purchaser, and the requirements for other elements shall be as given in table 1 for the grade that has the nearest (higher) tin content. SANS 710:2008 Edition 1.1 4 3.2 Flux 3.2.1 Compo
16、sition and consistency The flux shall be of uniform composition and shall not liquefy at 20 C. 3.2.2 Solubility The flux shall be completely soluble in warm (40-50 C) water. When a solder is tested in accordance with 6.4, the soldered area shall be found to be free from residual flux deposits. 3.3 F
17、orm and size 3.3.1 Form The solder shall be supplied in the form of round wire, or of ribbon, as specified by the purchaser. 3.3.2 Wire The nominal size (diameter) of solder in wire form shall be as specified by the purchaser and shall preferably be one of the diameters given in table 2. NOTE When a
18、 size not given in table 2 is specified by the purchaser, the tolerances applicable to the nearest size given in table 2 shall apply. 3.3.3 Ribbon The nominal size (cross-sectional dimensions) of solder in ribbon form and the tolerances on the width and thickness shall be as specified by the purchas
19、er. Table 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Content % (m/m) Sn Cu Bi As Fe Al + Zn + CdSum of other deleterious elements Total impurities*Type SANS grade ISO designation min. max. Sb max. max. max. max. max. max. max. Pb 40-S Pb-Sn40 39,0 40,0 0,30 max. 0,10 0,10 0,05 0,02 0,002 0,08 0,20 Remainder
20、 30-S Pb-Sn30 29,0 30,0 0,30 max. 0,10 0,10 0,05 0,02 0,002 0,08 0,20 Remainder Lead-tin solders antimony free 20-S Pb-Sn20 19,0 20,0 0,30 max. 0,10 0,10 0,05 0,02 0,002 0,08 0,20 Remainder Lead-tin solders containing antimony 12-S Pb-Sn12Sb 11,5 12,5 0,20-0,70 0,08 0,25 0,02 0,02 0,005 0,08 0,20 Re
21、mainder * i.e. all elements covered in columns 7-12 inclusive. SANS 710:2008 Edition 1.15 SANS 710:2008 Edition 1.1 6 Table 2 Wire diameters 1 2 3 4 5 6 7 8 9 10 11 Diameter, mm 3,15 2,50 2,24 2,00 1,60 1,25 1,00 0,90 0,71 0,50 Tolerance, mm 0,05 0,03 3.4 Flux content The flux core(s) shall be conti
22、nuous, uniform in cross-section, and symmetrically disposed in the solder, and the flux content of the solder, determined in accordance with 6.6, shall be not less than 1 % and not more than 4 % (m/m). 3.5 Spreading value The spreading value, determined in accordance with 6.2, shall be at least 150
23、mm2. 3.6 Activity The activity of a solder shall be such that, when the solder is tested in accordance with 6.3, it wets the stainless steel and spreads upon its surface. 3.7 Finish The surface of a solder shall be smooth, bright, and free from grease and other foreign matter and from signs of mecha
24、nical damage. 4 Packing and marking 4.1 Packing Unless otherwise agreed between purchaser and supplier, the solder shall be supplied on reels or in coils, each of net mass 500 g or 3 kg, as specified by the purchaser. Only solder of the same nominal size, grade, and batch identification shall be pac
25、ked together in a bulk container. 4.2 Marking 4.2.1 Reels and coils The following information shall appear in legible and indelible marking on each reel or coil or on a label securely attached to each reel or coil (or, when relevant, to its individual container): a) the manufacturers name or trade m
26、ark or both; b) the nominal size; c) the grade and the word “ACID-CORED“; d) the batch identification. SANS 710:2008 Edition 1.1 7 4.2.2 Bulk containers The following information shall, unless otherwise specified by the purchaser, appear in legible and indelible marking on each bulk container: a) a
27、description of the contents; b) the nominal size, grade, batch identification, and the word “ACID-CORED“; c) the quantity of reels or coils. 5 Sampling and compliance with the specification1)5.1 Sampling The following sampling procedure shall be applied in determining whether a lot complies with the
28、 relevant requirements of the specification. The samples so taken shall be deemed to represent the lot. After inspecting for compliance with section 4 take at random from the lot five reels or coils. 5.2 Compliance with the specification The lot shall be deemed to comply with the specification if af
29、ter inspection and testing of the sample taken in accordance with 5.1 no defective is found. 6 Inspection and methods of test 6.1 Inspection Inspect the samples taken in accordance with 5.1 for compliance with the requirements of 3.3, 3.4 (other than flux content), and 3.7. 6.2 Spreading test 6.2.1
30、Equipment a) Tin bath. A bath containing at least 4 kg of molten tin maintained at a temperature of 300 10 C. The depth of the melt shall be at least 25 mm. b) Metal plates. Five plates made of 60/40 brass sheet, of size 40 mm 40 mm and thickness approximately 0,5 mm, and each having one corner bent
31、 through 90 (to facilitate handling with forceps). Immediately before use prepare the plates as follows: 1) Degrease with a suitable organic solvent. 2) Etch for 15 s in the etching reagent (see 6.2.2). 3) Rinse immediately in clean running water. 4) If necessary, repeat operations (2) and (3) above
32、 until the plate surfaces have a uniformly etched finish. 1) This section applies to the sampling for inspection and testing before acceptance or rejection of single lots (consignments) in cases where no information about the implementation of quality control or testing during manufacture is availab
33、le to help in assessing the quality of the lot. It is also used as the procedure for adjudicating in cases of dispute. SANS 710:2008 Edition 1.1 8 5) Dip in ethyl alcohol. 6) Dry with blotting paper. NOTE Ensure that both during and after the preparation described above the plates are not touched wi
34、th the bare fingers or otherwise contaminated. c) Stopwatch. 6.2.2 Etching reagent A mixture having the following composition and maintained at a temperature of 15-25C: Sulphuric acid (relative density 1,82 at 20 /20 C) 80 mL (73,0 % (m/m) Nitric acid (relative density 1,33 at 20 /20 C) 39 mL (26,0
35、% (m/m) Sodium chloride 1,0 g (0,5 % (m/m) Lampblack 1,0 g (0,5 % (m/m) 6.2.3 Test specimens From each reel or coil taken in accordance with 5.1 cut one specimen of solder of mass 0,49-0,50 g. Ensure that the ends are so cut that impeding of the outflow of the flux is minimized. Immediately before t
36、esting, prepare each specimen as follows: a) wipe it with a clean rag soaked in ethyl alcohol; b) roll it into the form of a flat spiral or U (dependent upon the wire diameter) and compress to a thickness equal to 90% of the original diameter or width (as relevant) of the solder; c) dip it in ethyl
37、alcohol; d) dry it with blotting paper. NOTE Ensure that both during and after the above preparation the specimens are not touched with the bare fingers or otherwise contaminated. 6.2.4 Procedure Skim off the surface of the tin bath, float a prepared plate on the skimmed surface, and place a test sp
38、ecimen on the plate. Remove the plate from the bath 5 s after the solder starts to spread. Allow the plate to cool in a horizontal position and then measure accurately (in mm2) the area covered by the melted solder2). Repeat the procedure with the remaining four test specimens. Record the mean of th
39、e results as the spreading value of the solder. 6.3 Test for activity 6.3.1 Equipment a) Test piece stand (see figure 1). A stand so constructed (of stainless steel strip of thickness 0,7 mm and of steel wire of diameter 4 mm) as to be suitable for supporting the test squares at an angle of 15 1 fro
40、m the horizontal. b) Heat source. A suitable and convenient heat source, e.g. a bunsen burner. 2) Convenient methods of measuring this are given in appendix D. SANS 710:2008 Edition 1.1 9 c) Metal test pieces. Five flat square test pieces, of size 40 mm 40 mm 0,5 mm cut from cold-rolled and annealed
41、 stainless steel strip complying with the requirements of EN 10029 and EN 10095, polished (immediately before use) with medium grade metallurgical emery paper, and then degreased. Amdt 1 d) Mandrel. A mandrel of nominal diameter 3 mm. e) Stopwatch. 6.3.2 Test specimens From each reel or coil taken i
42、n accordance with 5.1, cut a piece of solder of length 18 mm and degrease it immediately before testing. 6.3.3 Procedure Use the following procedure on each specimen: Bend the specimen round the mandrel into a U-shape and place it in the centre of a test square. In the case of a solder of diameter 2
43、 mm or more, flatten the specimen to approximately 75 % of its original diameter. So position the test specimen on the test square and the assembly on the stand that the solder ends are inclined downwards and, by means of the heat source, apply such heat that the solder melts within a period of 2-5
44、s. Observe the behaviour of the melted solder and note whether it either wets and remains upon the test piece surface or runs off. NOTE It may be necessary to carry out preliminary tests to determine the correct adjustment of the heat source. 6.4 Test for solubility of flux 6.4.1 Equipment a) Humidi
45、ty cabinet. A suitable humidity cabinet maintained at a temperature of 38 2 C and a relative humidity of 95 3 %. b) Soldering iron. An electric soldering iron of capacity 30 W. c) Copper test pieces. Test pieces of size 30 mm 20 mm 0,4 mm cut from cold-rolled and annealed copper strip and degreased
46、immediately before use. d) Vice. A vice the jaws of which are covered with soft asbestos. e) Feeler gauge. An engineering type feeler gauge capable of measuring a gap of 0,10 mm. f) Magnifying glass. A glass of magnification 5-10X. g) Stopwatch. 6.4.2 Test specimens From each reel or coil taken in a
47、ccordance with 5.1 cut a piece of solder of length approximately 150 mm. SANS 710:2008 Edition 1.1 10 6.4.3 Procedure Use the following procedure to test each specimen: So mount two copper test pieces in the vice that one piece overlaps the other by 10 mm and that there is a capillary gap between th
48、eir contiguous surfaces of 0,10 mm (determined by means of the feeler gauge). Raise the soldering iron to working temperature and solder the two pieces together at the lap joint. Remove the assembly from the vice, allow it to cool to room temperature, and hold it in a stream of warm 40-50 C water fo
49、r 30 s. Allow the assembly to air dry in a warm place and place it in the humidity cabinet. After 14 d remove it from the cabinet and, after bending back the unsoldered portion of the lap joint, use the magnifying glass to examine the affected surfaces for evidence of corrosive action. 6.4.4 Evaluation Regard the soldered area as free from residual flux deposits if, after humidification, it shows no visible sign of pitting or greenish corrosion products. 6.5 Chemical analysis 6.5.1 Preparation of the sample for analysis a) From each reel or
