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 Incomplet... 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
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Included angle too narrow.
Low welding temperature resulting in rapid chilling.
Step 2
State TWO causes of each of the following arc-welding defects: Incomplete penetration
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Speed too fast during welding.
Poor welding technique used.
Step 3
State TWO preventative measures for the following welding defects during arc welding: Porosity
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Use correct current settings.
Ensure the use of clean electrodes.
Step 4
State TWO preventative measures for the following welding defects during arc welding: Lack of fusion
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Use the correct electrode size.
Ensure proper joint preparation according to specifications.
Step 5
Give ONE reason for performing the following tests on a welded joint: Free-bend test
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To determine the ductility of the weld metal and the heat-affected zone.
Step 6
Give ONE reason for performing the following tests on a welded joint: X-ray test
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To detect internal defects such as pin holes, slag inclusions, or cracks.
Step 7
Name THREE types of welding cracks.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
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.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Use the correct flame for the work on hand.
Ensure correct angle of the welding torch.
Step 9
Describe the steps to be followed when performing a nick-break test on a welded joint.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Slot each side of the weld with a saw.
Place the specimen on two steel supports in a bend vice.
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.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Non-destructive tests do not damage or destroy the test piece, allowing it to be used after inspection.
Step 11
Give TWO reasons for performing a machinability test on a welded joint.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To determine the quality of the finish of the weld.
