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| RESISTANT MATERIALS EXAMINATION QUESTION | ||||
| V. Ryan © 2004 | ||||
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The wheel barrow below is manufactured to be strong and mobile. Its main purpose is light gardening work. The large pneumatic wheel allows the wheel barrow to be moved over a typical garden without too much effort. |
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1. The body is
manufactured from aluminium. Name two advantages of aluminium over
steel. ADVANTAGE 1: Aluminium is very light and this means that the wheel barrow can moved around the garden easily. ADVANTAGE 2: It is rust proof. Even when the barrow comes into direct contact with water, it will not rust.
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| 2. What is meant by a pneumatic wheel / tyre? | ||||
| This is a tyre filled with pressurised air. | ||||
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| 3. What advantage does a pneumatic tyre have over other types of tyre? | ||||
| The barrow is moved around the garden more comfortably because the tyres 'cushions' the rough ground. | ||||
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4. The triangular frame is manufactured from one mild steel round section bar. It has been folded (bent) into the form of a triangle and joined together. |
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With the aid of a sketch, describe a technique that could be used to join the mild steel bar |
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| TECHNIQUES NAME: BRAZING | ||||
| DESCRIPTION: | ||||
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The joint area of the mild steel bar is heated on a brazing hearth. This raises the temperature of the metal to ‘red’ heat. Brazing rod (copper/zinc alloy) is then applied to the joint. The brazing rod melts and runs around the joint. When the joint cools the mild steel bar is permanently joined. |
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