6.1 State TWO causes of EACH of the following welding defects:
6.1.1 Undercutting
6.1.2 Lack of fusion
6.2 Explain how the ultrasonic test is conducted on a welding joint - NSC Mechanical Technology Welding and Metalwork - Question 6 - 2016 - Paper 1
Question 6
6.1 State TWO causes of EACH of the following welding defects:
6.1.1 Undercutting
6.1.2 Lack of fusion
6.2 Explain how the ultrasonic test is conducted on a weldi... show full transcript
Worked Solution & Example Answer:6.1 State TWO causes of EACH of the following welding defects:
6.1.1 Undercutting
6.1.2 Lack of fusion
6.2 Explain how the ultrasonic test is conducted on a welding joint - NSC Mechanical Technology Welding and Metalwork - Question 6 - 2016 - Paper 1
Step 1
State TWO causes of EACH of the following welding defects: Undercutting
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Answer
Improper settings of equipment (for instance, welding speed too fast).
Welding current too high.
Step 2
State TWO causes of EACH of the following welding defects: Lack of fusion
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Answer
Welding speed too fast.
Welding current too low.
Step 3
Explain how the ultrasonic test is conducted on a welding joint.
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Answer
The ultrasonic test involves sending a high frequency sound wave into the metal using a transducer. The same unit is then used to receive the sound wave. The deflections in the wave received indicate defects in the weld metal.
Step 4
State ONE advantage of conducting an ultrasonic test rather than an X-ray test on a welding joint.
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Answer
One advantage is that ultrasonic tests are cheaper and do not require additional materials or equipment.
Step 5
An X-ray test is conducted on a welded joint. How are the results observed and recorded?
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The results are observed and recorded using photographic film or a digital monitor/screen to visualize the X-ray image.
Step 6
Explain the purpose of the dye penetration test on a welding joint.
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Answer
The dye penetration test is used to detect surface or external flaws on a welded joint, ensuring the integrity of the joint.
Step 7
Give TWO examples of destructive tests that are conducted on welded joints.
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Answer
Nick break test.
Tensile test.
Step 8
Name TWO gases used with MIG/MAGS welding.
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Argon.
CO₂.
Step 9
Label A–F in FIGURE 6.1.
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Answer
A: Weld pool.
B: Arc/weld wire.
C: Contact nozzle.
D: Gas shroud.
E: Shielding gas.
F: Earth clamp.
