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 defect described is known as slag inclusion. This occurs when non-metallic solids become trapped in the weld metal, which can compromise the integrity of the weld.
Step 2
Name FOUR defects that may be observed during visual inspections.
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Answer
Shape of profile
Uniformity of surface
Overlap
Penetration bead
Step 3
State TWO causes of incomplete penetration in a welded joint.
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Answer
Weld speed too fast
Joint design faulty
Step 4
Name TWO measures to prevent a lack of fusion in a welded joint.
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Answer
Adjust electrode size
Correct preparation of joint
Step 5
Identify the destructive tests described below that are applied to a welded joint:
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Answer
5.1 Machinability test: This test assesses the weld's compatibility with machining processes.
5.2 Nick-break test: This test reveals internal defects by breaking the specimen and inspecting the fracture surface.
5.3 Bend test: Used to determine the ductility of the deposit and the heat-affected area adjacent to the weld.
Step 6
Explain how you will conduct a dye penetration test on a welded joint.
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Answer
To conduct a dye penetration test:
Clean the weld area thoroughly to remove any contaminants.
Spray dye onto the surface and allow it to penetrate.
After penetration, clean the excess dye away using a cleaning agent.
Allow the surface to dry completely.
Apply a developer to the surface to reveal any dye trapped in surface defects, which will highlight imperfections.
Step 7
State ONE function of EACH of the following components on the MIG/MAGS welding equipment:
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Answer
7.1 Wire feed controller: This component feeds the consumable electrode wire into the welding gun at a constant predetermined speed.
7.2 Welding gun: The welding gun activates the supply of gas, power, and electrode wire feed during the welding process.
Step 8
What is the function of the inert gas used during the MIG/MAGS welding process?
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Answer
The inert gas serves to shield the molten pool from atmospheric gases, preventing oxidation and contamination of the weld joint.
