Welding Essentials: Questions and Answers

Chapter 3: Brazing & Soldering

It is possible to fly without motors, but not without knowledge and skill.

Wilbur Wright

Introduction

Soldering has been used for thousands of years, but a solid theoretical understanding has come only in the last one hundred. Brazing is similar to soldering but is performed at higher temperatures. It has come into use more recently as higher temperature torches became available. Although soldering and brazing do not make joints as strong as welded ones, they are widely used in making and repairing a wide range of products from airplanes to household plumbing to jewelry. Soldering and brazing processes can be as simple as using a soldering iron or a propane torch or as complex as using radio frequency energy in a vacuum to join parts. We will discuss the theory, materials, fluxes, and common industrial processes. These processes have some advantages over welding and we will present them. There are safety issues too. Because soldering copper water pipe is so useful and something every weldor should know how to do, we cover step-by-step instructions in Chapter 15.

Process Names

What is the AWS designation for brazing?

The AWS designation for brazing is B.

What common names are sometimes used for brazing?

Silver soldering and hard soldering are non-preferred names for brazing. Silver brazing filler metals are not solder; they have melting points above 840 F (450 C).

How are brazing processes classified and what are the commercially significant ones?

Brazing processes are classified by heat source type. Commercially...

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