SMT Soldering Handbook surface mount technology 2nd phần 8 pptx
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...
SMT Soldering Handbook surface mount technology 2nd phần 1 doc
... 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...
SMT Soldering Handbook surface mount technology 2nd phần 2 docx
... 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...
SMT Soldering Handbook surface mount technology 2nd phần 3 doc
... 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...
SMT Soldering Handbook surface mount technology 2nd phần 4 potx
... 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...
SMT Soldering Handbook surface mount technology 2nd phần 5 potx
... 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...
SMT Soldering Handbook surface mount technology 2nd phần 6 doc
... 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...
SMT Soldering Handbook surface mount technology 2nd phần 7 pot
... 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...
SMT Soldering Handbook surface mount technology 2nd phần 9 pdf
... °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...
SMT Soldering Handbook surface mount technology 2nd phần 10 pdf
... 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...