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Brazing , Soldering , Adhesive Bonding , and Mechanical Joining Processes Brazing (1)Process (fig .30.1) -a makeweight surface is place at or between the faying surfaces to be joined , and the temperature is embossed to melt the filler metal just no t the workpiece -the molten metal fills the closely adaption space by capillary vessel action -filler metals utilize 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 joint 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) Typical Filler Metals for Brazing Various Metals and Alloys TABLE 30.

1 dish metal Aluminum and its alloys Magnesium alloys Copper and its alloys ferric and nonferrous (except aluminium and magnesium) Iron-, nickel-, and cobalt-base alloys Stainless steels, nickel- and cobalt-base alloys Filler metal Aluminum-silicon Magnesium-aluminum Copper- match Silver and copper 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 type?borax , boric sulfurous , 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 comparison t weightiness < 3 mm (d)Resistance brazing?part thickness of 0.1-12 mm (e)Dip braz ing?part thickness < 5mm Furnace Brazin! g Figure 30.2 An example of furnace brazing: (a) before, (b) after. subscriber line that the filler metal is a shaped wire. Brazing (f)Infrared brazing?a steep 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 want to shit a full essay, enjoin it on our website: OrderEssay.net

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