SMT Soldering Handbook surface mount technology 2nd phần 10 pdf

... 165–167 Solderwaves: asymmetrical wave, 108 – 110, 112 bridging, 108 , 110 chip waves, 110 115 combination waves, 113–115 design features of wavemachines, 103 , 104 double waves, 110 112 electrodynamic waves, ... waves, 113 jet-waves, 111, 112 peelback, 107 – 110 shadow effect, 105 107 slanting wave, 111 solderthieves, 109 , 110, 246 thermal role of solderwave, 104 , 105 Solderwa...

Ngày tải lên: 08/08/2014, 03:20

... Publications, Ayr, Scotland, p. 102 and (1993) Report to Soldering Science and Technology Club, 9 December, Teddington, England. 2. Lea, C. (1988) A Scientific Guide to Surface Mount Technology, Electrochemical Publications, ... 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 so...

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... 326 9.2 Soldering success and soldering perfection 327 9.2.1 Soldering success and soldering faults 327 9.2.2 Soldering perfection and soldering imperfections 330 9.3 Practical examples of soldering ... and their characteristics 100 4.3.3 Temperature control 102 4.4 The solderwave 103 4.4.1 Construction of the soldering unit 103 4.4.2 Thermal role of the solderwave 10...

Ngày tải lên: 08/08/2014, 03:20

... 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 ... wavesoldering soldering iron together with a metered amount of flux-cored solderwire to joints on three-dimensional assemblies, which because of their geometry do not lend them- selves...

Ngày tải lên: 08/08/2014, 03:20

... 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 ... (Section 10. 4.2). How to guard against this mishap, and what to do if it has happened, is discussed in the relevant section. 3.6.6 Solderability-enhancing surface coatings Uncoated...

Ngày tải lên: 08/08/2014, 03:20

... heated surface. Copper may have a higher heat capacity and thermal conductivity than solder (Table 4.1), but molten solder adapts to the shape of every surface it encounters. Both the ancient soldering ... 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 mo...

Ngày tải lên: 08/08/2014, 03:20

... threat to wavesoldering and its associated technologies of placing and curing SMD adhesives. Overhead soldering Reflowsoldering boards with SMDs on both sides involves ‘overhead soldering , for which ... °F melting range 302– 310 °C/576–590 °F Sequential soldering has been proposed in the past for reflowsoldering boards of Type II(b) (Section 2.2), with SMDs on both sides, soldering the...

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... distance (‘snap-off’) from Reflowsoldering 175 job:LAY05 page:40 colour:1 black–text Figure 5 .10 In-line vapourphase soldering system 5.4.5 ‘New-generation’ vapourphase soldering systems The preheat ... a 202 Reflowsoldering job:LAY05 page:62 colour:1 black–text Figure 5.20 Principal features of an IR reflowsoldering oven temperature of the underside of the board at between 100 °C/ 210 °F...

Ngày tải lên: 08/08/2014, 03:20

... Kirschner, M. and Marczi, M. (1990) Development of a fluxless soldering process for surface mount technology. Soldering and Surface Mount Technology, No. 4, pp. 23–26. See also USP 4.960.236. 33. ... Proc. Electronic Comps. and Technology Conf., pp. 507– 510. 37. Lea, C. (1989) Lasersoldering – Production and Microstructural Benefits for SMT. Soldering and Surface Mounting...

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... as 100 . Cleaning after soldering 281 job:LAY08 page:32 colour:1 black–text Table 8.8 MAC values of some common solvents Solvent MAC in ppm Methanol 200 Ethanol 100 0 Isopropanol 400 CFC 113 100 0 CHC ... with it. Impaired surface insulation resistance is a serious defect with boards carrying ICs with closely spaced leads and impedances of 10 to 10  ohm. Leakage currents of 10\ ...

Ngày tải lên: 08/08/2014, 03:20