Which of the following is the fusion welding process?

Explanation:

Fusion Welding Process

• Fusion welding is a group of welding processes wherein the joint between two metal pieces is achieved by melting the base metal and, in some cases, adding a filler material. The molten metal solidifies upon cooling, forming a strong bond between the pieces. These processes rely on heat, often provided by a flame, electric arc, or other sources, to create the weld.
• In fusion welding, the heat source melts the edges of the workpieces to form a pool of molten metal. A filler material may also be added to the molten pool to enhance the joint's strength. Once the molten metal solidifies, the two pieces are permanently joined. This process requires precise control of heat to avoid defects such as cracks or porosity in the weld.

Types of Fusion Welding Processes:

• Gas Welding: A flame generated by burning a mixture of fuel gas and oxygen is used to melt the metal. This is the correct option in this scenario and is discussed in detail below.
• Arc Welding: An electric arc between the electrode and the workpiece generates the heat required for welding.
• Laser Beam Welding: A laser beam is used as the heat source for melting the metal.
• Electron Beam Welding: A focused beam of high-velocity electrons is used to generate the heat necessary for welding.

Advantages:

• High strength and durability of the weld joint.
• Capability to join dissimilar materials.
• Versatile applications in various industries, such as automotive, construction, and aerospace.

Disadvantages:

• Requires skilled operators to ensure proper execution.
• Potential for defects such as cracks and porosity if not performed correctly.
• Heat affected zone (HAZ) may alter the properties of the base metal.

Applications: Fusion welding processes are widely used in industries requiring strong and reliable joints. Examples include the manufacturing of pressure vessels, pipelines, automotive components, and structural frameworks.