Label the MIG-welding equipment indicated in FIGURE 6.1 according to the letters A–I - NSC Mechanical Technology Automotive - Question 6 - 2017 - Paper 1
Question 6
Label the MIG-welding equipment indicated in FIGURE 6.1 according to the letters A–I.
**Figure 6.1**
**Figure 6.1**
6.2
Label the MIG-welding process indicated... show full transcript
Worked Solution & Example Answer:Label the MIG-welding equipment indicated in FIGURE 6.1 according to the letters A–I - NSC Mechanical Technology Automotive - Question 6 - 2017 - Paper 1
Step 1
Label the MIG-welding equipment indicated in FIGURE 6.1 according to the letters A–I.
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Answer
A: Regulator
B: Flow meter
C: Continuous wire reel
D: Wire feed roller unit
E: Gun conduit
F: Welding gun
G: Weld pool
H: Work piece
I: Earth clamp
Step 2
Label the MIG-welding process indicated in FIGURE 6.2 according to the letters A–E.
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Answer
A: Parent metal
B: Molten pool
C: Continuous electrode wire
D: Nozzle
E: Gas shroud
Step 3
Name THREE non-destructive tests that can be performed on welded joints.
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Answer
X-ray testing
Liquid dye penetrant
Ultrasonic testing
Step 4
Explain how the nick-break test is performed on a weld.
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Answer
To perform a nick-break test:
Make a hacksaw cut at both edges through the centre of the weld.
Use a sledge hammer to break the specimen by striking it in the zone where you made the saw cuts.
Ensure the weld metal exposed in the break should be completely free from slag inclusions and contain no gas pockets greater than 1.6 mm.
Step 5
What is the purpose of inert gas with the MIG-welding process?
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Answer
The purpose of inert gas in the MIG-welding process is to protect the weld area from oxygen and water vapour, thereby preventing contamination that could affect the quality of the weld.
Step 6
After inspecting a weld, slag inclusion was discovered in the weld. Name TWO causes for this.
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Answer
Solid metals entrapped in the weld metal or between the weld metal and the base metal.
Insufficient weld temperature leading to improper melting of the filler material.
