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Solder paste knowledge training - selection of solder paste - Dongguan Lvzhidao

作者:Lvzhidao solder factory 2019-11-07 0

Today, lvzhidao solder factory has carried out the solder paste knowledge training for the business department, so that the salesmen can know more about lvzhidao solder paste products, better serve the customers and meet their needs.

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Today's solder paste knowledge training includes:

Introduction of solder paste

        Solder paste is a mixture of uniform and stable tin alloy powder, solder paste and special additives. Alloy connection can be formed after welding. This kind of material is very suitable for reliable welding of automatic production of surface mount. Solder paste is the product of high technology of modern electronic industry.


        The composition of solder paste is generally 90% tin alloy powder, 10% solder paste and other additives.


Selection of solder paste classification

Common solder paste alloy table

Alloy composition

Industry common name

Liquid temperature

Solid temperature℃

Sn63 / Pb37

6337  Sn63

183

183

Sn62 / Pb36 / Ag2

6236Ag2  Ag2

179

179

Sn62.8 / Pb36 .8/ Ag0.4

Ag0.4

179

183

Sn10 / Pb88 / Ag2

88   (高温Ag2

290

268

Sn5 / Pb92.5 / Ag2.5

Ag2.5

280

280

Sn96.5 / Ag3.0 / Cu0.5

SAC305  305

219

217

Sn98.5 / Ag1.0 / Cu0.5

SAC105  105

217

227

Sn99 / Ag0.3/ Cu0.7

SAC0307  0307

227

229

Sn42 / Bi58

Bi58  4258

138

138

Sn64 / Bi35/Ag1

Bi35   Ag1

138

187


Solder paste alloys are selected according to lead or not

Is there any lead in it

Alloy composition

Lead alloy

Sn63 / Pb37

Sn62.8 / Pb36.8 / Ag0.4

Sn60Pb40,Sn55Pb45,Sn50Pb50

Sn62.8 / Pb36 .8/ Ag0.4

Sn 63Pb36.8Ag0.2

High lead Superalloy

It is currently exempt from RoHS

Sn10 / Pb90

Sn5 / Pb92.5 / Ag2.5

Lead free alloy

Sn96.5 / Ag3.0 / Cu0.5

Sn99 / Ag0.3/ Cu0.7

Sn98.5 / Ag1/ Cu0.5

Sn64 / Bi35/Ag1

Sn64.7Bi35Ag0.3

Sn42 / Bi58


Solder paste alloy is selected according to melting point temperature

Alloy composition

Melting point temperature

Liquid temperature

Solid temperature℃

Sn63 / Pb37

Ordinary moderate temperature class


Most processes are applicable


183

183

Sn62 / Pb36 / Ag2

179

179

Sn62.8 / Pb36 .8/ Ag0.4

179

183

Sn10 / Pb90

Ultra high temperature


Used for semiconductor products with high temperature resistance


290

268

Sn5 / Pb92.5 / Ag2.5

280

280

Sn96.5 / Ag3.0 / Cu0.5

High temperature lead free


It is suitable for most lead-free processes


219

217

Sn99 / Ag0.3/ Cu0.7

227

229

Sn42 / Bi58

Low temperature lead free


It is suitable for the welding of lead-free materials which are not resistant to high temperature and the radiator which has large heat absorption or the secondary migration welding


138

138

Sn64 / Bi35/Ag1

138

187


Selection of solder paste alloy by welding process classification

welding technology

Alloy composition

SMT welding process

Sn63 / Pb37

Sn96.5 / Ag3.0 / Cu0.5

Sn62 / Pb36 / Ag2

Sn99 / Ag0.3/ Cu0.7

Sn62.8 / Pb36 .8/ Ag0.4

Sn42 / Bi58

Sn64 / Bi35/Ag1

Semiconductor welding process

Sn10 / Pb88 / Ag2

Sn5 / Pb92.5 / Ag2.5

Through hole welding process

Sn63 / Pb37

Sn42 / Bi58

Sn62.8 / Pb36 .8/ Ag0.4

Sn64 / Bi35/Ag1

Sn99 / Ag0.3/ Cu0.7

Radiator welding process

Sn63 / Pb37

Sn42 / Bi58 Sn64


Sn63Bi35/Ag1

hot-bar


Sn64 / Bi35/Ag1

Sn96.5 / Ag3.0/ Cu0.5


All categories of solder paste under this topic will be shared next time. In addition, this topic also tells about solder paste particles, solder paste mesh and other knowledge points.


The remaining two themes

Please read the following article

How to use solder paste

Setting of reflow temperature of lead free solder paste



Dongguan lvzhidao Metal Co., Ltd. [lvzhidao solder factory] has a complete production system, producing and selling solder paste, solder wire, solder bar, lead-free solder bar, lead-free solder wire, lead-free solder paste and other products. For more details, please visit the official website of Lvzhidao:www.dglzd.com 。


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