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Describe the basic differences between manual metal arc welding and gas welding - Leaving Cert Engineering - Question 4 - 2013
Question 4
Describe the basic differences between manual metal arc welding and gas welding. Suggest a suitable application for each of the welding processes in 4(a)(i) above. ... show full transcript
Worked Solution & Example Answer:Describe the basic differences between manual metal arc welding and gas welding - Leaving Cert Engineering - Question 4 - 2013
Step 1
Describe the basic differences between manual metal arc welding and gas welding.
Answer
In gas welding, the heat source is a flame of acetylene burning in an atmosphere of pure oxygen, producing a flame that can reach temperatures of approximately 3250°C. Gas welding is typically used for lighter gauge materials and enables a more controlled and precise welding process.
In contrast, manual metal arc welding uses an electrical discharge to generate heat, typically from an electrode that melts and joins the workpieces. The operating temperature can reach around 4000°C, making it suitable for thicker materials and heavier applications.
Step 2
Suggest a suitable application for each of the welding processes in 4(a)(i) above.
Answer
Gas welding is ideal for applications like welding box section or tubular steel due to its precision and ability to join thinner materials. On the other hand, manual metal arc welding is better suited for heavier machinery components, such as gates or farm machinery, where deeper penetration and stronger welds are required.
Step 3
Name and describe the three types of oxy-acetylene flame shown.
Answer
(i) Carburising Flame: This flame has an excess of acetylene and appears elongated with a feather at the tip. It is used primarily for welding high-carbon steels.
(ii) Oxidising Flame: This flame has an excess of oxygen, resulting in a blue cone. It is typically utilized for welding brass and cutting ferrous metals.
(iii) Neutral Flame: This flame has equal amounts of oxygen and acetylene, creating a balanced flame. It is the most commonly used flame in welding, suitable for welding a variety of materials without altering the metal's composition.