FIGURE 5.1 below indicates a roof truss. Label parts A–E. Draw a neat sketch of a welding symbol indicating the following information for a T-joint done with arc welding: The fillet weld on both sides is 6 mm in size. The lengths of the weld beads are 40 mm each and the pitch of the weld is 90 mm. A mild steel ring must be manufactured using a 20 x 20 mm square mild steel bar. The inside diameter of the ring is 215 mm. 5.3.1 Calculate the dimensions of the material needed to manufacture the ring. 5.3.2 Draw a neat sketch of the ring indicating the dimensions.

NSC Mechanical Technology Welding and Metalwork Use of templates and roof trusses: FIGURE 5.1 below indicates a roo

FIGURE 5.1 below indicates a roof truss - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2019 - Paper 1

Question 5

FIGURE 5.1 below indicates a roof truss. Label parts A–E. Draw a neat sketch of a welding symbol indicating the following information for a T-joint done with arc we... show full transcript

Worked Solution & Example Answer:FIGURE 5.1 below indicates a roof truss - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2019 - Paper 1

Step 1

5.1 Label parts A–E.

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Answer

A – Purlin
B – Rafter
C – Incline tie
D – Tie beam
E – Shoe plate / Gusset plate

Step 2

5.2 Draw a neat sketch of a welding symbol indicating the following information for a T-joint done with arc welding.

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Answer

The welding symbol should include the following:

Fillet weld size: 6 mm on both sides.
Length of weld beads: 40 mm each.
Pitch of the weld: 90 mm.
Symbol should represent a T-joint with an arc.
The drawing should reflect these attributes accurately.

Step 3

5.3.1 Calculate the dimensions of the material needed to manufacture the ring.

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Answer

To find the dimensions of the material needed:

Calculate the mean diameter:
Mean diameter = Inside diameter + Thickness
Mean diameter = 215 mm + 20 mm = 235 mm
Calculate the mean circumference:
Mean circumference = π × Mean diameter
Mean circumference = π × 235 mm ≈ 738.27 mm
Round off the circumference to get approximately 740 mm.

Step 4

5.3.2 Draw a neat sketch of the ring indicating the dimensions.

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Answer

The sketch of the mild steel ring should illustrate:

Inside diameter: 215 mm
Outside diameter (calculated as Inside diameter + Thickness): 235 mm
Thickness: 20 mm
Clearly label all dimensions on the sketch.

FIGURE 5.1 below indicates a roof truss - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2019 - Paper 1

Worked Solution & Example Answer:FIGURE 5.1 below indicates a roof truss - NSC Mechanical Technology Welding and Metalwork - Question 5 - 2019 - Paper 1

5.1 Label parts A–E.

5.2 Draw a neat sketch of a welding symbol indicating the following information for a T-joint done with arc welding.

5.3.1 Calculate the dimensions of the material needed to manufacture the ring.

5.3.2 Draw a neat sketch of the ring indicating the dimensions.

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