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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 Automotive - Question 6 - 2016 - Paper 1
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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 Automotive - Question 6 - 2016 - Paper 1
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6.2 Explain how the ultrasonic test is conducted on a welding joint.
Answer
Ultrasonic testing involves sending a high-frequency sound wave into the metal. A transducer emits the sound waves, which travel through the material. If there are any defects, such as cracks or voids, the sound waves will reflect back differently, indicating the presence of flaws. The equipment then interprets these reflections to provide a visual or audible representation of the weld integrity.
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6.3 State ONE advantage of conducting an ultrasonic test rather than an X-ray test on a welding joint.
Answer
One advantage of ultrasonic testing over X-ray testing is that ultrasonic methods do not require additional equipment such as photographic film or a computer for results, making it more convenient and cost-effective.
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6.4 An X-ray test on a welded joint. How are the results observed and recorded?
Answer
In X-ray testing, results are observed by producing images on photographic film or through digital means, such as monitors or screens. The resulting images display the internal structure and any anomalies of the welded joint.
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6.5 Explain the purpose of the dye penetration test on a welding joint.
Answer
The purpose of the dye penetration test is to detect surface or external flaws in a welded joint. The dye penetrant is applied to the surface, and any flaws will draw the dye into them, which can then be seen after excess dye is removed.
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6.6 Give TWO examples of destructive tests that are conducted on welded joints.
Answer
Two examples of destructive tests on welded joints include the Nick break test, which checks for flaws or weaknesses, and the tensile test, which measures how much load a welded joint can withstand before failing.
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