5.1 FIGURE 5.1 below shows a drawing of a roof truss. Label parts A–G. 5.2 FIGURE 5.2 below shows a brass ring that must be manufactured using a 15 x 15 mm square bar. The ring has an outside diameter of 380 mm. Calculate the following: 5.2.1 The mean diameter of the ring 5.2.2 The mean circumference of the ring. Round off your answer to the nearest whole number. 5.3 Draw the welding symbol for the joint that needs to be arc welded in FIGURE 5.3 below. 5.4 What is the purpose of supplementary weld symbols? 5.5 State TWO advantages of using templates. 5.6 Name any THREE machines used in a template loft.

NSC Mechanical Technology Welding and Metalwork Heat treatment of steel and effect of temperature: 5.1 FIGURE 5.1 below shows a dra

5.1 FIGURE 5.1 below shows a drawing of a roof truss - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2024 - Paper 1

Question 5

5.1 FIGURE 5.1 below shows a drawing of a roof truss. Label parts A–G. 5.2 FIGURE 5.2 below shows a brass ring that must be manufactured using a 15 x 15 mm square b... show full transcript

Worked Solution & Example Answer:5.1 FIGURE 5.1 below shows a drawing of a roof truss - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2024 - Paper 1

Step 1

Label parts A–G.

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Answer

A - Roof sheeting B - Ridging C - King post D - Tie beam/main tie E - Internal bracing F - Rafter G - Gusset plate

Step 2

The mean diameter of the ring

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Answer

To find the mean diameter (MeanØ), we subtract the plate thickness from the outside diameter:

MeanØ = OutsideØ - plate thickness

MeanØ = 380 mm - 15 mm = 365 mm

Step 3

The mean circumference of the ring

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Answer

The mean circumference (C) can be calculated using the formula:

$C = ext{π} imes ext{MeanØ}$

Using the calculated MeanØ:

$C = ext{π} imes 365$

Approximately:

$C ext{ (rounded to the nearest whole number)} = 1147 ext{ mm}$

Step 4

Draw the welding symbol for the joint that needs to be arc welded.

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The welding symbol can be depicted as follows:

       _____      
      /     \    
-----|  ARC  |---
      \_____/

Step 5

What is the purpose of supplementary weld symbols?

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Answer

Supplementary weld symbols are used to indicate additional information about a weld, which may clarify the type or method of welding to be used.

Step 6

State TWO advantages of using templates.

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Answer

Quicker to use to improve mass production and ensure accuracy.
Templates are cheap to manufacture and can help reduce waste.

Step 7

Name any THREE machines used in a template loft.

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Answer

Planer
Circular saw
Drilling machine

5.1 FIGURE 5.1 below shows a drawing of a roof truss - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2024 - Paper 1

Worked Solution & Example Answer:5.1 FIGURE 5.1 below shows a drawing of a roof truss - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2024 - Paper 1

Label parts A–G.

The mean diameter of the ring

The mean circumference of the ring

Draw the welding symbol for the joint that needs to be arc welded.

What is the purpose of supplementary weld symbols?

State TWO advantages of using templates.

Name any THREE machines used in a template loft.

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