5.1 Give TWO reasons why the template loft is separated from the workshop in most cases. 5.2 Describe the purpose of purlins as used on roof trusses. 5.3 A steel ring with an outside diameter of 880 mm must be fabricated from a 50 x 50 mm square steel bar. 5.3.1 Calculate the dimensions of the required material. 5.3.2 Make a neat sketch of the steel ring indicating the mean diameter, outside diameter and the thickness of the material. 5.4 Identify the following resistance weld symbols: 5.4.1 5.4.2 5.5 FIGURE 5.5 below shows a welding symbol. Label parts A–F on the welding symbol.

NSC Mechanical Technology Welding and Metalwork Welding terms and symbols: 5.1 Give TWO reasons why the tem

5.1 Give TWO reasons why the template loft is separated from the workshop in most cases - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2018 - Paper 1

Question 5

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5.1 Give TWO reasons why the template loft is separated from the workshop in most cases. 5.2 Describe the purpose of purlins as used on roof trusses. 5.3 A steel r... show full transcript

Worked Solution & Example Answer:5.1 Give TWO reasons why the template loft is separated from the workshop in most cases - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2018 - Paper 1

Step 1

5.1 Give TWO reasons why the template loft is separated from the workshop in most cases.

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Answer

The template loft is often separated from the workshop to ensure:

Quieter Environment: It provides a quieter working environment, minimizing distractions and enhancing focus.
Better Lighting: The loft typically has better lighting, which is crucial for precision in template making.

Step 2

5.2 Describe the purpose of purlins as used on roof trusses.

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Answer

Purlins serve two main purposes:

Support the Roof Covering: They provide the necessary support for the roof covering, ensuring a stable and strong structure.
Stabilize the Trusses: Purlins help stabilize the trusses, distributing loads evenly to prevent structural failure.

Step 3

5.3.1 Calculate the dimensions of the required material.

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Answer

To calculate the dimensions of the required material:

Mean Diameter Calculation:
- Mean Diameter = Outside Diameter - Plate Thickness
- Mean Diameter = 880 mm - 50 mm = 830 mm
Mean Circumference Calculation:
- Mean Circumference = π × Mean Diameter
- Mean Circumference = π × 830 mm ≈ 2607.52 mm
Steel Bar Requirement:
- 2608 mm of 50 x 50 mm square steel bar is required to fabricate the ring.

Step 4

5.3.2 Make a neat sketch of the steel ring indicating the mean diameter, outside diameter and the thickness of the material.

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Answer

The sketch should include:

A circle representing the outside diameter of 880 mm.
A circle representing the mean diameter of 830 mm.
Indicate the plate thickness of 50 mm between the two circles.

Step 5

5.4 Identify the following resistance weld symbols:

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Answer

5.4.1 Spot Weld: This symbol indicates a spot weld where two pieces are joined at distinct points.

5.4.2 Seam Weld: This symbol represents a seam weld, where two pieces are joined along a continuous seam.

Step 6

5.5 FIGURE 5.5 below shows a welding symbol. Label parts A–F on the welding symbol.

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Answer

In labeling parts A–F of the welding symbol:

A: Tail
B: Weld Symbol (Fillet weld)
C: Pitch of Weld
D: Site Weld
E: Arrow
F: Weld all around

5.1 Give TWO reasons why the template loft is separated from the workshop in most cases - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2018 - Paper 1

Worked Solution & Example Answer:5.1 Give TWO reasons why the template loft is separated from the workshop in most cases - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2018 - Paper 1

5.1 Give TWO reasons why the template loft is separated from the workshop in most cases.

5.2 Describe the purpose of purlins as used on roof trusses.

5.3.1 Calculate the dimensions of the required material.

5.3.2 Make a neat sketch of the steel ring indicating the mean diameter, outside diameter and the thickness of the material.

5.4 Identify the following resistance weld symbols:

5.5 FIGURE 5.5 below shows a welding symbol. Label parts A–F on the welding symbol.

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