SMT Soldering Handbook surface mount technology 2nd phần 8 pptx

... (Figures 8. 6 and 8. 7). 270 Cleaning after soldering job:LAY 08 page:30 colour:1 black–text Figure 8. 13 An in-line pure jet cleaning plant (OSL) job:LAY 08 page:1 colour:1 black–text 8 Cleaning after soldering 8. 1 ... 265 job:LAY 08 page:4 colour:1 black–text Figure 8. 1 Map of world climates. After Britten, R. and Matthews, G. W. (1 988 ) Plessey Assessment Services; Electro...

Ngày tải lên: 08/08/2014, 03:20

... colour:1 black–text 4 Wavesoldering 84 4.1 The wave concept 84 4.1.1 Wavesoldering before SMDs 84 4.1.2 Wavesoldering after SMDs 85 4.2 Applying the flux 87 4.2.1 Types of fluxer 87 4.2.2 Monitoring ... solvents 315 8. 6 Testing for cleanliness 3 18 8.6.1 The meaning of cleanliness 3 18 8.6.2 Measuring ionic contamination (MIL test) 319 8. 6.3 Measuring surface insulation resi...

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... and zone thickness Soldering method Confrontation Temperature Zone period °C °F thickness m Wavesoldering 2–5 sec 250 480 0.3–0 .8 Reflow: Laser 0.02–0.04 sec 250–350 480 –900 O0.1 Vapour phase ... UK. Figure 3 .8 The mechanical behaviour of soldered joints under stress 42 Soldering job:LAY03 page:2 colour:1 black–text 3 Soldering 3.1 The nature of soldering and of the soldered...

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... itself (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:LAY03 ... force. 76 Soldering job:LAY03 page:43 colour:1 black–text Table 3.12 Heat required to raise the temperature of a substance from 20 °C/ 68 °F to a soldering heat of 250 °C/ 482 °F...

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... their use has been phased out (Sections 8. 3.5 and 8. 3.6). Several alternative cleaning methods have been and are still being developed (Sections 8. 3.7 and 8. 4), but nobody likes to clean a soldered ... 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 bit well covered with mol...

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... dispensing ampoule is mounted on an xy Wavesoldering 143 job:LAY05 page :8 colour:1 black–text Single-pass soldering The option, of putting the components on both sides and then soldering the whole board ... threat to wavesoldering and its associated technologies of placing and curing SMD adhesives. Overhead soldering Reflowsoldering boards with SMDs on both sides involves ‘overhead so...

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... pointed out already, for both wavesoldering and vapourphase soldering. It has been found that IR reflowsoldering too benefits in several respects from a controlled atmos- 2 08 Reflowsoldering job:LAY05 page:31 ... 932 2.0 87 3 600 1112 3.4 973 700 1292 5.1 1073 80 0 1472 7.7 1273 1000 183 2 15.0 emitted not only by a solid body, but also by a hot gas (e.g. from a flame) or a hot liquid. In in...

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... Production and Microstructural Benefits for SMT. Soldering and Surface Mounting Technology, No. 2, pp. 13–21. 38. Lea, C. (1 988 ) A Scientific Guide to Surface Mount Technology. Electrochemical Publications, ... Klein Wassink, R. J. (1 989 ) Soldering in Electronics, 2nd ed., Electrochemical Publications, Ayr, Scotland, p. 587 . 43. Strauss, R. (1 988 ) loc. cit (in German). Re...

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... °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 123 28. 0 °C /82 .4 °F 68 1.6 0.02 0.02 HCFC 141b 32.0°C /89 .6 °F 61 12 0.15 0. 18 123/141b- 30.0 °C /80 .0 °F85— —— Methanol azeotrope ‘Pefol’* ... Teddington, England. 2. Lea, C. (1 988 ) A Scientific Guide to Surface Mount Technology, Electrochemical Publications, Ayr, Scotland, p. 436. 3. Lea, C. (1 988 ) l...

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... 291 Vapourphase desoldering, 353 Vapourphase soldering: equipment, batch operation, 184 , 185 , 188 in-line operation, 185 – 188 physical aspects, 179– 183 safety aspects, 184 use of preheating, 186 – 188 using ... 359 Solvent cleaning: batch systems, 284 – 288 environmental precautions, 287 , 288 immersion systems, 284 – 289 in-line systems, 288 –291 Solvent-power of cleaning medi...

Ngày tải lên: 08/08/2014, 03:20