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 to prevent overheating and potential fires.

Do not touch electrical fences with your bare hands, as it can cause electrical shock.

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

The plasma cutting process uses a tungsten electrode and high-pressure plasma gas to create an electrical arc. This arc is established between the nozzle and the workpiece. The electrode is responsible for the cutting, while the pressurized plasma helps to remove metal impurities from the cut.

1. Gun/Pistol
2. Spout
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 compared to traditional methods.
2. Greater deposition rates, leading to increased efficiency.
3. Better weld pool visibility, making it easier to control the weld.

To cut a 20 mm thick mild steel plate, light the flame and adjust it to a carburizing flame. Start by heating the area to a red hot color. Next, introduce oxygen using the lever on the cutting attachment which leads to the steel igniting and turning into a liquid state. The iron is then cleared from the cut by pressure from the oxygen stream.

Ensure that the pieces to be welded are of the correct measurements and prepared properly. Start by grinding a V-groove on both sides of the steel to enhance the weld penetration. After that, tack the pieces together while ensuring accurate alignment. Then, proceed with the arc welding, keeping the electrode in the correct position as you manipulate the bead along the joint.

1. Longitudinal shrinking
2. Angular shrinking