QUESTION 6: JOINING METHODS
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
QUESTION 6: JOINING METHODS
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... show full transcript
Worked Solution & Example Answer:QUESTION 6: JOINING METHODS
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 (e.g., incorrect electrode size).
Welding speed too fast.
Step 2
State TWO causes of EACH of the following welding defects: Lack of fusion
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Answer
Welding current too low.
Weld joint very wide.
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. The same unit used to send the sound wave is then utilized to receive the 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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It is cheaper than X-ray testing.
Step 5
An X-ray test is conducted on a welded joint. How are the results observed and recorded?
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Results from the X-ray test are observed on photographic film, paper, or a monitor/screen. These methods allow for visual analysis of the weld.
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.
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.
Carbon Dioxide (CO2).
Step 9
Label A–F for MIG/MAGS welding process as shown in FIGURE 6.1.
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Answer
A - Weld pool
B - Arc/Weld wire
C - Contact nozzle
D - Gas shroud / nozzle
E - Shielding gas
F - Earth cable / ground wire.
