SMT Soldering Handbook surface mount technology 2nd phần 1 doc

... development 11 8 4.5.2 Wavesoldering in nitrogen 11 9 4.6 Board conveyor systems 12 6 4.6 .1 Functional requirements 12 6 4.6.2 Board-handling systems 12 6 4.7 Wavesoldering practice 13 0 4.7 .1 Operating ... family 11 job:LAY00 page:7 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 Apply...

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... sphere: in effect, the surface behaves like a tensioned skin which encloses the molten solder, hence the term surface tension’ (Figure 3 .11 ). Surface tension, tending to reduce the surface of a given ... absolute temperature (Section 3.2 .1) , it is not surprising that at, for example, 10 0 °C/ 212 °F the tin Soldering 43 job:LAY03 page:28 colour :1 black–text Figure 3 .10 The so...

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... 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 page: 41 ... Becker, G. (19 86) The Effect of Impurity Elements on the Soldering Properties of Eutectic and Near Eutectic Tin–Lead Solders. Brazing & Soldering (UK), No. 11 , pp. 4 11 . Sold...

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... energy K °C °F (watt/cm) 373 10 0 212 0 .1 473 200 392 0.3 573 300 572 0.6 673 400 752 1. 2 773 500 932 2.0 873 600 11 12 3.4 973 700 12 92 5 .1 1073 800 14 72 7.7 12 73 10 00 18 32 15 .0 emitted not only by ... 70 1. 94 0.0007 not available FC 5 311 2.03 0.0005 13 ; air LS 16 2 1. 82 0.0007 16 ; air Flutec PP1 2.03 not available not available Freon (R 113 ) 1. 57 0.0007 6 ;...

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... the solder fall back into the wave (Figure 4 .15 ). 10 8 Wavesoldering job:LAY04 page:24 colour :1 black–text Figure 4 .11 The shadow effect (see Section 4 .1) , with many SMD joints located in recesses ... have two pumps, one for each wave, but both Wavesoldering 11 1 job:LAY04 page:36 colour :1 black–text 4.5 Wavesoldering in an oxygen-free atmosphere 4.5 .1 Origins and development No...

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... 9453: I. 62.5%–63.5% Sn II. 61. 5%–62.5% Sn, 1. 8%–2.2% Ag* melting point 18 3 °C/3 61 3 61 °F melting point 17 8 °C/352 °F *The old DIN 17 07 specified an Ag content of 1. 3 1. 5%. This was based on the suspicion ... reaction between the 15 4 Reflowsoldering job:LAY05 page :11 colour :1 black–text Wavesoldering A great advantage of wavesoldering is its status as a mature and well under...

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... (19 89) Lasersoldering – Production and Microstructural Benefits for SMT. Soldering and Surface Mounting Technology, No. 2, pp. 13 – 21. 38. Lea, C. (19 88) A Scientific Guide to Surface Mount Technology. ... spectrum, laser soldering Reflowsoldering 217 job:LAY05 page:86 colour :1 black–text 5 .10 References 1. Beine, H. (19 97) Reflowsoldering of Wired Components, Productronic...

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... °F27 CHC 11 1** 74 .1 °C /16 5.4 °F 12 4 CFC 11 3/Methanol azeotrope 39.6 °C /10 3.3 °F45 CFC 11 3/Isopropanol azeotrope 46.4 °C /11 5.5 °F47 CFC 11 3/Methanol/Dichloroethylene azeotrope* 38.4 °C /10 1 .1 °F not ... n.a. 10 00 non-polar (CFC 11 3, ‘Freon‘, ‘Arklone’) 11 7.7 °F 11 1–Trichloro-Ethane 1. 46 74 .1 °C n.a. 350 non-polar (CHC 11 1, Methyl-Chloroform, 16 5.4 °F ‘Genkl...

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... 11 = 1. 0) (years) CFC 11 3 47.6 °C /11 7.7 °F 27 90 0.85 1. 3 CHC 11 1 74 .1 °C /16 5.4 °F 12 4 6.3 0 .13 0.02 HCFC 12 3 28.0 °C/82.4 °F 68 1. 6 0.02 0.02 HCFC 14 1b 32.0°C/89.6 °F 61 12 0 .15 0 .18 12 3 /14 1b- ... be 312 Cleaning after soldering job:LAY08 page:36 colour :1 black–text Table 8 .10 GWP values of some solvents Solvent Emission (19 85) GWP in kilo tonnes/yr CFC...

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... 10 3, 10 4 double waves, 11 0 11 2 electrodynamic waves, 11 3 jet-waves, 11 1, 11 2 peelback, 10 7 11 0 shadow effect, 10 5 10 7 slanting wave, 11 1 solderthieves, 10 9, 11 0, 246 thermal role of solderwave, 10 4, ... 17 6 17 8 thixotropy, 16 5 viscosity and its measurement, 16 5 16 7 Solderwaves: asymmetrical wave, 10 8 11 0, 11 2 bridging, 10 8, 11 0 chip waves, 11 0 11 5...

Ngày tải lên: 08/08/2014, 03:20