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.
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Worked Solution & Example Answer:The table below shows four welding defects - NSC Agricultural Technology - Question 4 - 2021 - Paper 1
Step 1
4.1.1 Name of the Welding Defect
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Answer
Porosity
Step 2
4.1.2 Possible Causes
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• Blocked nozzle
• Gas flow too low or high
• Irregular gas mix
• Undercutting due to improper torch angle
• Plate not cleaned properly
Step 3
4.1.3 Name of the Welding Defect
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Answer
Spatter
Step 4
4.1.4 Possible Causes
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• Voltage too low
• Inductance too low
• Rusty or dirty surface
Step 5
4.1.5 Name of the Welding Defect
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Answer
Undercut
Step 6
4.1.6 Possible Causes
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• Welding speed too fast
• Incorrect torch angle
• Poor technique
Step 7
4.1.7 Name of the Welding Defect
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Answer
Lack of fusion
Step 8
4.1.8 Possible Causes
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