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Soldering 1

soldering 2

Example illustration:
Bridging between adjacent vertical square wire terminations

CQI Certificate

CQI Diploma

CQI ADDITIONAL Information

GENERAL INFORMATION



PHOTOGRAPHIC GUIDE TO SOLDERING QUALITY

Available either as a book or CD Rom Adobe Acrobat pdf file

Note: The book contents are also delivered in QM&T's Soldering Quality training course

 

Ever had problems with soldering? Want to explain to operators, solders or suppliers the exact quality standard you expect and require? Want to demonstrate to the quality improvement team the soldering quality standard expected? Want to show exactly what good and possibly more importantly what bad soldering looks like? Then this is the book for you.

The popularity of the Slide Sets as an aid in the inspection of soldered printed circuit boards and joints on assemblies, has led to a number of these slides being reproduced as colour photographs in the present booklet. It is intended that these will constitute an easily accessible reference guide to good and defective solder wetting and joints produced by mass soldering operations. As such they may be used to teach personnel concerned with the design, production and inspection of soldered printed circuit assemblies some of the defects that may arise during mass soldering as well as t o illustrate the appearance of high quality soldered joints; they may also be put to practical use on the work-bench as a reference guide in assessing acceptability of soldered assemblies.

Quality Control
The production of mass-soldered printed circuit assemblies of high reliability requires the application of a carefully planned quality control scheme, whether the final product is destined for the entertainment or the domestic appliance market where economics are a major factor, or for applications such as telephone systems, computers, railway signalling, aerospace and defence operations in which maximum reliability is an overriding factor. This booklet is directed towards the final production stage of inspection of the completed soldered assembly, after all the necessary controls have been exercised on the production line. In order to obtain the maximum number of perfect soldered joints, consideration must be given to the mechanical design and geometry of the soldered joints, to the selection of a solder alloy suitable for the proposed service stress and temperature conditions, and to the selection of suitable, readily solderable finishes for all component parts comprising the soldered joints. In addition, solderability testing of the parts to be soldered must be carried out prior t o their utilisation on the production line, and adequate consideration given to the selection of the flux, the temperature-time cycle during soldering, and maintenance of the solder bath composition. The quality of the final soldered joints will be sacrificed if these aspects are ignored in order to facilitate some other part of the production process.


SUBJECTS COVERED IN THIS BOOK INCLUDE:

  • Quality control
  • Soldered joint testing
  • Solder wetting
  • Defects arising from poor soldering
  • Defects arising from the soldering process
  • Defects arising from incorrect design of assembly
  • Notes to the User
  • Photographic contents
  • Illustrative plates

 

CONTENTS LIST

  • Quality control
  • Soldered joint testing
  • Solder wetting
  • Defects arising from poor soldering
  • Defects arising from the soldering process
  • Defects arising from incorrect design of assembly
  • Notes to the User
  • Photographic contents
  • Illustrative plates

Illustrations:

  • Perfect wetting, plain laminate
  • Perfect wetting, etched printed circuit
  • Degrees of non-wetting, plain laminate
  • Degrees of non-wetting, etched printed circuit
  • Non-wetted vertical terminations, completely wetted land
  • Partially wetted clinched wire terminations, completely wetted land
  • Imperfectly wetted fluted pin, completely wetted land
  • Degrees of dewetting, plain laminate
  • Degrees of dewetting, etched printed circuit
  • Completely wetted vertical termination, but dewetted land
  • Dewetted land, partially wetted spade termination
  • Good wetting of vertical termination, poor wetting of plated through holes
  • Fully wetted lands, dewetted vertical wire terminations
  • Degrees of fillet formation
  • Amounts of solder in the joint
  • Bridging Icicles
  • Blowhole

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