What welding defect is described as non-metallic solids trapped in the weld metal?
Name FOUR defects that may be observed during visual inspections - NSC Mechanical Technology Welding and Metalwork - Question 6 - 2017 - Paper 1
Question 6
What welding defect is described as non-metallic solids trapped in the weld metal?
Name FOUR defects that may be observed during visual inspections.
State TWO caus... show full transcript
Worked Solution & Example Answer:What welding defect is described as non-metallic solids trapped in the weld metal?
Name FOUR defects that may be observed during visual inspections - NSC Mechanical Technology Welding and Metalwork - Question 6 - 2017 - Paper 1
Step 1
What welding defect is described as non-metallic solids trapped in the weld metal?
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Answer
The welding defect described as non-metallic solids trapped in the weld metal is known as slag inclusion.
Step 2
Name FOUR defects that may be observed during visual inspections.
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Answer
Shape of profile
Uniformity of surface
Overlap
Crack free
Step 3
State TWO causes of incomplete penetration in a welded joint.
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Answer
Weld speed too fast
Incorrect weld current
Step 4
Name TWO measures to prevent a lack of fusion in a welded joint.
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Answer
Correct preparation of joint
Adjust electrode size
Step 5
Identify the destructive tests described below that are applied to a welded joint: To determine the weld hardness and strength
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Answer
Machinability test
Step 6
Identify the destructive tests described below that are applied to a welded joint: To reveal internal defects
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Answer
Nick-break test
Step 7
Identify the destructive tests described below that are applied to a welded joint: To determine the ductility of the deposit and the heat-affected area adjacent to the weld
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Answer
Bend test
Step 8
Explain how you will conduct a dye penetration test on a welded joint.
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Answer
Clean the weld that needs to be tested.
Spray dye onto the surface and leave to penetrate.
Excess dye is cleaned away with a cleaning agent.
Allow surface to dry.
Spray a developer onto the surface to bring out the dye trapped in the crack.
The dye will show all the surface defects.
Step 9
State ONE function of EACH of the following components on the MIG/MAGS welding equipment: Wire feed controller
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Answer
Feeds the consumable electrode wire to the welding gun at a constant predetermined speed.
Step 10
State ONE function of EACH of the following components on the MIG/MAGS welding equipment: Welding gun
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Answer
Activates the supply of gas, power and wire feed.
Step 11
What is the function of the inert gas used during the MIG/MAGS welding process?
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Answer
The inert gas shields the molten pool from the atmospheric gases.
