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Brazing , Soldering , Adhesive Bonding , and Mechanical joining Processes Brazing (1)Process (fig .30.1) -a filler admixture is mail service at or in the midst of the faying surfaces to be joined , and the temperature is emboss to melt down the filler metal but no t the workpiece -the molten metal fills the near fitting space by capillary tubing vessel action -filler metals deter arcminuteationd for brasing melt above 450? Brazing Figure 30.1 (a) Brazing and (b) braze join operations. Brazing (2)Characteristics -low wraping and residual stresses -strength of the brazed critical point depends on (a)joint design (b)adhesion at the interfaces of the workpiece and filler metal (3)makeweight metals and brazing temperature (table 30.1)  common Filler Metals for Brazing Various Metals and Alloys TABLE 30.

1 report metal Aluminum and its alloys Magnesium alloys squealer and its alloys ferric and nonferrous (except aluminum and magnesium) Iron-, nickel-, and cobalt-base alloys untarnished steels, nickel- and cobalt-base alloys Filler metal Aluminum-silicon Magnesium-aluminum Copper-phosphorus Silver and atomic number 29 alloys, copper- phosphorus Gold Nickel-silver Brazing temperature, (°C) 570620 580625 700925 6201150 9001100 9251200 Brazing (4)Fluxes -prevent oxidisation and remove oxide films from workpiece surfaces -flux role?borax , boric acid , borates , fluorides , chlorides -wetting agents Brazing (5)Brazing methods -(a)Torch brazing? use oppressiveness of 0.25-6 mm (b)Furnace brazing (fig.30.2) (c)Induction brazing?rapid heating comparability t onerousness < 3 mm (d)Resistance brazing? give away thickness of 0.1-12 mm (e)Dip brazing?part thickness < 5mm Furnace Brazing Figure 30.2 An practice session of furnace brazing: (a) before, (b) after. ancestry that the filler metal is a shaped wire. Brazing (f)Infrared brazing?a mettlesome frenzy quarts lamp part thickness < l mm (g)Diffusion brazing?30 min 24 hrs part thickness?foil 50 mm (6)Design for brazing -joint...If you trust to shit a rich essay, order it on our website: Orderessay

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