Brazing
and Soldering
Outcomes
1. Be able to compare (similarities
and differences, advantages and disadvantages) between joining process
categories: brazing, soldering, and welding.
2. Be able to compare (similarities
and differences, advantages and disadvantages) between different joining within
each of the following process categories: brazing, soldering, and welding.
3. Be able to connect the
scientific principles, engineering challenges, and non-technical (business,
safety etc) for each process and process category.
Preparation
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The
very beginning of Chapter 30 is excellent, however the difference between
brazing and soldering is not the 450C/840F threshold. We will discuss this is
the presentation. Examine Figure 30.3 carefully – we will discuss why the
interface can be stronger in a brazed joint as shown. However, I would just
skim the rest of Section 30.1 as it makes you aware of some of the challenges
with manual brazing. Table 30.1 and the associated text supports what we will
discuss as the reason for the arbitrary (and not complete) temperature
criterion to differentiate brazing from soldering. As you read Section 30.1.3 Pay
particular attention to the use of brazing paste in Figure 30.5, but only focus
on torch, furnace and resistance brazing. Think of how to compare these with
the welding processes and later the soldering processes. While the introduction
the Section 30.2 is excellent except for the focus on the arbitrary temperature
criterion, ignore section 30.2.1 and as you read section 30.2.2 only focus on Soldering
Fluxes, and Table 30.2, which will serve the same purpose as Table 30.1. Ignore
the paragraph on Solders (there are too many mistakes and claims that could
lead to misconceptions). The figures showing joint design are not relevant.
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You
Tube video on Brazing
versus Welding is one of the best I have seen and should be reviewed. The
You Tube Video describing Brazing
and Soldering shows how furnace brazing can be used to increase
productivity. This video also mentions the difference between Brazing and
Soldering based on intermetallics vs solid-solutions.