Joining
Module
Outcomes
1. Be able to compare (similarities
and differences, advantages and disadvantages) of the various welding processes
2. 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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Chapters
28-30 describe the various joining processes we will be discussing, The
introduction in Chapter 28 is good except I disagree that welding is limited to
“skilled trades” welding is becoming automated. The bullet point regarding
defects will be discussed throughout this module. Although the description of
fusion welding processes is excellent, the description of non fusion processes
is not as robust. Liquid can form and disappear in diffusion welding. You
should become familiar with the subject matter presented in section 28.2.. In
Section 28.3 focus on melting and solidification, power density, and energy
required to melt. The two factors are an attempt to oversimplify heat transfer
and efficiency of melting; keep a big picture perspective do not focus on the
math associated with the two f factors. We will expand on the subject matter in
Section 28.4 in the presentation. As you read section 29.1 focus on comparing
similarities and differences between the various types of arc welding. Focus on
power source, weld pool protection and practicality. As you read section 29.2
focus on comparing the various processes to spot welding, Regarding Sections
29.3 and 4 we will look at oxy-fuel as a power source for welding, brazing, and
soldering. The only specialized process we will mention is thermit
welding. We will discuss some of the processes in Section 29.5 (diffusion and
friction stir welding) but not to the detail of the arc and resistance welding
processes. However Section 29.6 and forward is important. As you read this try
to connect design to quality and quality
to power source, melting efficiency, weld pool protection, and practicality.
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The
following videos from the text provide great examples of: Resistance
Welding, I think it will help put the subject matter referred to in Section
29.3 more relevant. I also suggest the viewing the following You Tube
videos welding in general , arc welding , mig
welding , tig welding , this should help you compare the
different processes discussed in Section 29.1