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Subject: Welding/Fabrication |
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1. Topic-
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| GMAW Welding Gun parts and changing liner for wire size |
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2. Content-
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(1) Explain all safety precautions to be considered before any work
on machine parts is to begin. Welding machine must be removed from
its source of power.
(2) Demonstrate and lecture of parts that the MIG gun consists of
and how to dissemble and replace all internal pieces. Show students
what parts are considered to be consumables, such as contact tip,
nozzle, and inner liner. Show students the identifying markings on
contact tip and inner liner that determine what size wire they are
designed to be used with.
(3) Install a new inner liner and show students how to size and cut
new liner to the correct length if needed.
(4) Explain the reason why inner liners and consumables need to be
changed and what are some of the signs or indicators to look for to
determine when to change them. |
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3. Goals: Aims/Outcomes-
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1. Convey the importance of safety, never work on a machine that
is possibly still powered.
2.Students understand the parts and operation of the MIG gun, and
understand the importance of the consumable parts.
3.Students understand the need for properly sized wire and consumables. |
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4. Objectives-
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1.Given the task of replacing parts in the MIG gun the students
will be able to identify the parts, remove and replace them correctly.
2.Students will be able to determine when consumables need to be replaced
and what parts specifically are causing the problem.
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5. Materials and Aids-
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MIG gun and welder
New consumables, contact tips .023 and .035, inner liner for .023
and .035, and welding wire .023 and .035 mild steel |
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Practice-
| Allow students to change parts in the MIG gun and change the inner
liner. |
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Checking for understanding-
| Group question and answer time , clear up any issues or problems
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Closure-
| Revisit the importance of safety. |
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