QUESTION 8: JOINING METHODS (INSPECTION OF WELDS) (SPECIFIC)
8.1 State TWO causes of EACH of the following arc-welding defects:
8.1.1 Slag inclusion
8.1.2 Incomplete penetration
8.2 State TWO preventative measures for the following welding defects during arc welding:
8.2.1 Porosity
8.2.2 Lack of fusion
8.3 Give ONE reason for performing the following tests on a welded joint:
8.3.1 Free-bend test
8.3.2 X-ray test
8.4 Name THREE types of welding cracks - NSC Mechanical Technology Welding and Metalwork - Question 8 - 2021 - Paper 1
Question 8
QUESTION 8: JOINING METHODS (INSPECTION OF WELDS) (SPECIFIC)
8.1 State TWO causes of EACH of the following arc-welding defects:
8.1.1 Slag inclusion
8.1.2 Incomple... show full transcript
Worked Solution & Example Answer:QUESTION 8: JOINING METHODS (INSPECTION OF WELDS) (SPECIFIC)
8.1 State TWO causes of EACH of the following arc-welding defects:
8.1.1 Slag inclusion
8.1.2 Incomplete penetration
8.2 State TWO preventative measures for the following welding defects during arc welding:
8.2.1 Porosity
8.2.2 Lack of fusion
8.3 Give ONE reason for performing the following tests on a welded joint:
8.3.1 Free-bend test
8.3.2 X-ray test
8.4 Name THREE types of welding cracks - NSC Mechanical Technology Welding and Metalwork - Question 8 - 2021 - Paper 1
Step 1
State TWO causes of EACH of the following arc-welding defects: Slag inclusion
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Answer
Included angle too narrow.
Welding temperature too low / current too low.
Step 2
State TWO causes of EACH of the following arc-welding defects: Incomplete penetration
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Answer
Speed too fast.
Poor welding technique.
Step 3
State TWO preventative measures for the following welding defects during arc welding: Porosity
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Answer
Use correct current.
Ensure adequate shielding gas.
Step 4
State TWO preventative measures for the following welding defects during arc welding: Lack of fusion
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Answer
Use correct included angle.
Use the correct current setting.
Step 5
Give ONE reason for performing the following tests on a welded joint: Free-bend test
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Answer
Used to determine the percentage of elongation of the welded metal.
Step 6
Give ONE reason for performing the following tests on a welded joint: X-ray test
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Answer
To determine whether there has been full depth penetration.
Step 7
Name THREE types of welding cracks.
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Answer
Heat affected zone (HAZ) cracks.
Centre line / longitudinal cracks.
Transverse cracks.
Step 8
State TWO factors that should be observed during the oxy-acetylene welding process.
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Answer
Correct flame for the work on hand.
Correct angle of nozzle.
Step 9
Describe the steps to be followed when performing a nick-break test on a welded joint.
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Answer
Each side of the weld is slotted by means of a saw.
Place the specimen on two steel supports in a bench vise.
Break the specimen by striking it with a hammer.
Inspect the weld metal for exposed defects.
Step 10
Explain why non-destructive tests are preferred to destructive tests.
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Answer
Non-destructive tests do not involve the destruction or damage of the test piece, allowing it to be used afterward.
Step 11
Give TWO reasons for performing a machinability test on a welded joint.
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