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