SMT Soldering Handbook surface mount technology 2nd phần 3 doc

... (Figure 3. 14). Wavesoldering, vapourphase soldering, hot air or gas convection soldering, impulse soldering and handsoldering with a soldering iron present equilibrium Soldering 61 job:LAY 03 page:41 ... melting) 1 g FR4 33 8 watt. sec A soldered joint (volume 1 cub. mm) 0.7 watt. sec A circuit board 27 kw sec 23. 3 cm ; 16 cm 9.2 in ; 6 .3 in (‘Europa’ format) 1.2 mm/47 mil th...

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... in electronics 27 3. 2 .3 Lead-free solders 29 3. 2.4 Solder impurities 31 3. 3 The soldered joint 36 3. 3.1 Soldering as a surface reaction between a molten and a solid metal 36 3. 3.2 Structure and ... the soldered joint 37 3. 3 .3 Mechanical properties of soldered joints 40 3. 3.4 Soldering on surfaces other than copper 41 3. 3.5 Long-term behaviour of soldered joints 4...

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... harm. Soldering 35 job:LAY 03 page:4 colour:1 black–text Figure 3. 1 The principle of handsoldering With handsoldering, the heat source is the tip of a soldering iron, which is heated to 30 0 35 0 ... UK. Figure 3. 8 The mechanical behaviour of soldered joints under stress 42 Soldering job:LAY 03 page:2 colour:1 black–text 3 Soldering 3. 1 The nature of soldering and of th...

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... energy K °C °F (watt/cm) 37 3 100 212 0.1 4 73 200 39 2 0 .3 5 73 300 572 0.6 6 73 400 752 1.2 7 73 500 932 2.0 8 73 600 1112 3. 4 9 73 700 1292 5.1 10 73 800 1472 7.7 12 73 1000 1 832 15.0 emitted not only ... 0. 43 0.60 0.89 2.0 5.1 watt/in 2.58 3. 60 5 .34 12.0 30 .6 kw/m 4 .3 6.0 8.9 20 51 Wavelength of 5.5 m 5.0 m 4.6 m 3. 7 m 2.4 m the energy maximum:  max Emit...

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... every surface it encounters. Both the ancient soldering iron and some of the latest techniques of desoldering and resoldering SMDs make use of this conveni- ent fact, by always working with a soldering ... requirements of wavesoldering if the standard eutectic tin/lead solder (melting point 1 83 °C /36 1 °F) is being used. If the machine runs with one of the lead-free solders (Section...

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... Pb melting point 139 °C/282 °F melting point 1 83 °C /36 1 °F melting point 221 °C/ 430 °F melting range 30 2 31 0 °C/576–590 °F Sequential soldering has been proposed in the past for reflowsoldering boards ... Section 3. 2.4, item 3, for the beneficial effect of silver in solder): Solders to ISO 94 53: I. 62.5%– 63. 5% Sn II. 61.5%–62.5% Sn, 1.8%–2.2% Ag* melting point 1 83 °C /36 1 36...

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... for SMT. Soldering and Surface Mounting Technology, No. 2, pp. 13 21. 38 . Lea, C. (1988) A Scientific Guide to Surface Mount Technology. Electrochemical Publications, Ayr, Scotland, p. 30 2. 39 . ... SMD technology. Productronic, 5, pp. 30 34 (in German). 32 . Bandyopadhyay, N., Kirschner, M. and Marczi, M. (1990) Development of a fluxless soldering process for surface m...

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... 124 CFC 1 13/ Methanol azeotrope 39 .6 °C/1 03. 3 °F45 CFC 1 13/ Isopropanol azeotrope 46.4 °C/115.5 °F47 CFC 1 13/ Methanol/Dichloroethylene azeotrope* 38 .4 °C/101.1 °F not reported CFC 1 13/ Ethanol/Dichloroethane ... ppm) Methanol 30 0 zero zero 12 Ethanol 900 zero zero 27 Isopropanol 800 zero zero 15 CFC 1 13 1000 0.85 2100 zero CFC 1 13/ Methanol azeotrope 30 0 0.75 not reported no...

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... dealt with in detail in Section 3. 3.5. See also References 22 and 23 of Chapter 3. 9.2 Soldering success and soldering perfection 9.2.1 Soldering success and soldering faults In soldering, two things matter ... 1.0) (years) CFC 1 13 47.6 °C/117.7 °F 27 90 0.85 1 .3 CHC 111 74.1 °C/165.4 °F 124 6 .3 0. 13 0.02 HCFC 1 23 28.0 °C/82.4 °F 68 1.6 0.02 0.02 HCFC 141b 32 .0°C/89....

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... 51 watersoluble fluxes, 53 Soldering imperfections and defects, 33 0, 33 1, 33 6 soldering irons, 22 Soldering irons for rework, 34 5, 34 6 Soldering methods, comparison between, 228– 231 Soldering perfection, ... 32 7, 33 0 its acceptable/unacceptable nature, 33 0, 33 1 Soldering robots, 22 Soldering success, 24, 32 7 Soldering success, definition of, 32 7 its yes/n...

Ngày tải lên: 08/08/2014, 03:20