Joining
Module
Outcomes
1. Be able to compare (similarities
and differences, advantages and disadvantages) between joining process
categories: adhesive bonding, 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: adhesive bonding, 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
š
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 f 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. 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. Pay particular attention to the use of
brazing paste in Figure 30.5.. The remainder of the
chapter is excellent. The connection between adhesive bonding and the other
processes is great. We will not focus on mechanical fastening.
š
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
š
Welding
and Brazing Experiences Provided for Freshmen at Kettering. Focus not only on
how the processes relate to welding and brazing in general, but on the details
of the procedures. You may want to compare these to your notes from the reading
and the videos. You may want to refer to these later in the course when ISO and
Safety are discussed.