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Brazing , Soldering , Adhesive Bonding , and Mechanical Joining Processes Brazing (1)Process (fig .30.1) -a makeweight metal is place at or between the faying surfaces to be joined , and the temperature is embossed to melt the filler metal exclusively no t the workpiece -the molten metal fills the closely registration 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 residuum 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 stall metal Aluminum and its alloys Magnesium alloys Copper and its alloys ferric and nonferrous (except aluminum and magnesium) Iron-, nickel-, and cobalt-base al loys 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 blistering , 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 equation t weightiness < 3 mm (d)Resistance brazing?part thickness of 0.1-12 mm (e)Dip brazing?part thickness < 5mm Furnace Brazing Figure 30.2 An example of furnace brazing: (a) before, (b) after. demarcation that the filler metal is a shaped wire. Brazing (f)Infrared brazing?a game frenzy quarts lamp part thickness < l mm (g)Diffusion brazing?30 min 24 hrs part thickness?foil 50 mm (6)Design for b! razing -joint...If you want to shit a full essay, stage it on our website: OrderEssay.net

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