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AWS A5.31M/A5.31:2012 pdf free download
AWS A5.31M/A5.31:2012 pdf free download.Specification for Fluxes for Brazing and Braze Welding.
13. Particle Test
13.1 The test method used to measure particle size ot dispensable paste tiuxes shall be as agreed UX)fl by the manufacturer and the user.
13.2 The particle consistency of paste flux is acceptable when the entire amount of a 60 g 12 oil sample will pass through a
425 pm IUSA Standard Testing Sieve No. 401. The screen shall conform to ASTM El 1-01. Heating the flux sample at a
temperature of upto a maximum of 82°C 1180°F1 before testing is permissible. The flux may be worked lightly with a brush.
13.3 The particle consistency of a slurry flux is acceptable when the entire amount of a 60 g 12 oil sample will pass through a 106 pm sieve IUSA Standard Testing Sieve No. 1401. Heating the flux sample at a temperature of up to a maximum of 82°C 1l80°FI before testing is permissible. The flux may be worked lightly with a brush.
13.4 Liquid fluxes shall not exhibit any visible particles when examined without magnilication. Heating the flux sample at a temperature of upto a maximum of 82°C Il8WFI hetre testing is permissible.
14. Adhesion rrt
The adhesion characteristics of the flux shall be determined using the following procedures:
14.1 For temperatures below the activity temperature range, the following apply:
14.1.1 Using a brush, apply a uniform layer of flux approximately 0.8 mm 10.03 I inj thick to one surface of the test specimen (see Figure I).
14.1.2 Examination No. I: Examine the fluxed surface for areas of nonwetting.
14.1.3 With the same test specimen inclined at a 60° minimum angle, heat in an air atmosphere furnace that has been preheated to 55°C 1 100° Fl below the minimum activity temperature of Table I, hold at the furnace temperature for three minutes, and air cool to room temperature.
14.1.4 Examination No. 2: Examine the fluxed surface for areas of flux loss or retraction.
14.2 The results of the tests are acceptable when each of the two examinations (see 14.1.2 and l4.l.4) indicates that the flux coating is continuous, i.e., free from areas of nonwetting or areas of flux loss or retraction.AWS A5.31M/A5.31:2012 pdf free download.
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