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The table below shows four welding defects - NSC Agricultural Technology - Question 4 - 2021 - Paper 1
Question 4
The table below shows four welding defects. Redraw the table in your ANSWER BOOK and write down the answers to QUESTIONS 4.1.1 to 4.1.8. | Illustration | Name of th... show full transcript
Worked Solution & Example Answer:The table below shows four welding defects - NSC Agricultural Technology - Question 4 - 2021 - Paper 1
Step 1
Step 2
4.1.2 Give the Possible Causes
Answer
The possible causes for each defect are:
-
Porosity:
- Blocked nozzle
- Gas flow too low or high
- Inadequate cleaning of materials
- Moisture in the welding area
-
Spatter:
- Voltage too low
- Inductance settings incorrect
- Rusty or dirty surface
-
Undercut:
- Welding speed too fast
- Poor technique
- Incorrect angle of the welding gun
-
Lack of fusion:
- Insufficient amperage
- Wrong torch angle