4.1 Study the pictures below and provide an applicable accident-preventing safety regulation for each situation - NSC Agricultural Technology - Question 4 - 2016 - Paper 1

Do not overload electrical wall sockets.

Do not touch electrical fences and do not try to pull someone away from an electrical fence with your bare hands.

Prevent tractors from tipping over by not driving against steep slopes.

The plasma-cutting process involves using a tungsten electrode and high-pressure plasma gas (which is gas in an ionized state) to generate and carry an electrical arc between the nozzle and workpiece. The electrical arc performs the cutting, while the pressurized plasma helps to clear the cut by removing metal impurities.

1. Gun/Pistol
2. Sprout
3. Filling wire guide
4. Copper contact tip
5. Filler wire

1. High carbon alloy steel (stainless alloys)
2. Aluminium
3. Mild steel

1. Higher welding speeds.
2. Greater deposition rates.
3. Less post weld cleaning (e.g., no slag to chip off).

To cut a 20 mm thick mild steel plate, light the flame and adjust it to a carburizing flame. First, bring the material up to a red hot color. Then, oxygen is fed while the lever is engaged on the cutting attachment. The steel ignites and turns into a liquid, allowing the iron liquid to be cleared from the cut by the pressure from the oxygen stream.

Ensure that the pieces to be welded are of the correct measurements and are ready for welding. Prepare the workpieces properly (using root gaps). Grind a V-groove on both sides. Tack the preparatory pieces together, ensuring that the correct electrode and current are set for the workpiece.

1. Longitudinal shrinking.
2. Angular shrinking.