FIGURE 5.1 below indicates a roof truss. 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: 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. 5.3 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 Developments and templates: 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. 5.2 Draw a neat sketch of a welding symbol indicating the following information for a T-joint done with ar... 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 clearly indicate a fillet weld on both sides with dimensions labeled. The weld size should be shown as 6 mm for both sides. The lengths of the weld beads need to be marked as 40 mm each, and the pitch should be labeled as 90 mm.

Step 3

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

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Answer

To calculate the dimensions, we use the formula for the mean diameter: Mean diameter = Inside diameter + Thickness.

The thickness is 20 mm, so:

Mean diameter = 215 mm + 20 mm = 235 mm.

Next, we calculate the mean circumference using:

Mean circumference = π × Mean diameter = π × 235 mm ≈ 738.27 mm.

Rounding off gives 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 should depict a circular ring with an outer diameter of 235 mm and an inner diameter of 215 mm. The thickness of the material should also be labeled as 20 mm.

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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