Roberts Introduction to Brazing Technology

Erscheinungsjahr 2016
ISBN: 978-1-4987-5845-1
Verlag: CRC Press
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 360 Seiten

Introduction to Brazing Technology provides practical guidance for the industrial production of an effectively brazed joint. Written in plain language by an active technical consultant with more than 50 years of brazing experience, this clear and concise book:

- Explains the fundamental concepts of the brazing process

- Covers all the common heating methods used for brazing

- Describes how to obtain brazing operator accreditation

- Addresses the latest advances in brazing technology

- Features an extensive glossary of brazing terms

- Underscores the importance of the joint gap

- References EN and ISO standards

Introduction to Brazing Technology ensures a good working knowledge of the application of brazing as an industrial joining technique. The book offers new and existing users of the technology a comprehensive reference for tackling the day-to-day challenges encountered during the brazing process.

Autoren/Hrsg.

Roberts, P.M

Fachgebiete

• Geisteswissenschaften Design Produktdesign, Industriedesign
• Technische Wissenschaften Maschinenbau | Werkstoffkunde Technische Mechanik | Werkstoffkunde
• Technische Wissenschaften Verfahrenstechnik | Chemieingenieurwesen | Biotechnologie Metallurgie

Inhaltsverzeichnis

Process Fundamentals and Operator Safety
Setting the Scene
Wetting
Capillary Flow
Health and Safety in Brazing

Where Brazing Fits in Joining Technology
Which Specific Process Should Be Used?
What Are the Advantages of Brazing?
Basic Definitions and Principles
Capillary Attraction and Capillary Flow
Solidus, Liquidus, Melting Range and Eutectic
Working Temperature
Liquation
Process Window
Heat Pattern Development
Procedures
Component Cleanliness
Summary: Fundamental Rules for Successful Brazing

Joint Design Fundamentals
Introduction
Basic Joint Design Configurations
Atmosphere Furnace Brazing

Filler Materials, Fluxes and Brazing Paste Fundamentals
Introduction
Aluminium-Base Filler Materials
Silver-Base Filler Materials
Self-Fluxing CuP and AgCuP Alloys
Copper-Brazing Filler Materials
High-Temperature Nickel (and Cobalt) Filler Materials
Unclassified Platinum-Group Metal Filler Alloys
ISO Standardised Noble-Metal-Bearing Filler Materials
Brazing Fluxes
Brazing Alloy Pastes

Brazing with Flames
Torches for Manual Flame Brazing
Flame Process Relationships
Heating with Flames
Gases and Gas Mixtures
Hand-Torch-Brazing Technique
Automated Flame-Brazing Machines
Process Complexity

Induction and Resistance Heating
Introduction
What Induction Heating offers in Brazing
Commonly Used Inductor Shapes
Design of Joints and the Associated Inductors
Resistance Heating

Furnace Brazing
Introduction
Oxide Films
Brazing in a Reducing Atmosphere
Types of Furnaces Used for Brazing
Brazing in Vacuum
Vacuum Brazing Process Parameters
Further General Comments on Vacuum Brazing
Vapour Pressure

Brazing Aluminium
Introduction to the Technology of Aluminium Brazing
Use of Brazing for the Joining of Aluminium and its Alloys

Troubleshooting and Some Common Brazing Problems
Identification of the Problem
Methodology of Troubleshooting
Are You Asking Yourself the Right Questions?
Flexibility
Seeking Advice
Frequently Asked Questions
Is It Possible to Braze Ceramics?
Can I Braze to the Surface of an Electroplated Item?
Which Filler Material Will Be Best for the Brazing of Tungsten Carbide Teeth to Circular Saw Blades?
Can Brass Be Successfully Brazed without Flux in a Reducing-Atmosphere Furnace?
Can Contact with Ammonia Result in the Corrosion of a Joint?
What Is the Maximum Temperature at Which a Brazed Joint Can Be Safely Used?
Can Tool Steels Be Brazed?
What Is Crevice Corrosion?
What Is the Trillium Project?

Accreditation of Brazing Operators
Scope
Normative References
Approval of the Parts to Be Joined by Brazing
Terms and Definitions
Information and Requirements to be both agreed upon and Documented
Brazing Variables
The pBPS
Stage 4: Approval of Operators
Test Pieces and Test Specimens
Examination and Testing
Range of Approval
Brazing Procedure Approval Record

Importance of the Joint Gap in Brazing
Some Initial Points about Brazing When a Flux Is Used
Some Initial Points about Fluxless Brazing Processes
Contribution of the Brazing Gap to Process Control
Brazing in conjunction with Flux
Process Parameters for the Use of Flux
High-Temperature Brazing in conjunction with a Flux
Fluxless Brazing Processes
Filler Metal Pre-Placement: Sandwich Joints
Conventional Pre-Placement of Filler Material

Glossary

Addendum A: SafeFlame®

Appendix A: Selection Charts

Appendix B: Filler Metal Comparison Tables

Über Autor(innen)

P. M. Roberts first encountered the brazing process when he joined Johnson Matthey and Company Limited in 1956 to train as an assayer of industrially used silver alloys and silver-containing brazing filler materials. In 1958, he changed departments and trained as a process control metallurgist, and studied the intricacies and the technology of the subject at Battersea Polytechnic, the forerunner of Surrey University. In 1963, an opportunity arose for him to join the Sales Technical Services Department of Johnson Matthey Metals to be trained as a specialist brazing engineer. During the next 30 years, he held a sequence of technical posts that provided support to the customers of three of the four leading producers of brazing materials in the Western world, and gained hands-on practical experience in the specification and use of automated brazing equipment and continuous-conveyor brazing furnaces. Between 1993 and 1996, he was the manager of the Precious Metals Division of the UK Branch of Degussa AG. He took early retirement on his 60th birthday in 1996, and created Delphi Brazing Consultants, a small but specialised business that is still in operation. This change of role on his retirement has been instrumental in his being able to write and help clients around the world solve brazing problems.