Exam Question
(a) Describe types of arc welding processes. (8)
(b) Describe what level of temperatures are reached during arc welding. (4)
(c) Describe precautions taken to avoid health and shock hazards during welding. (4)
Class 4 (4th Engineer)
MEP
📅 Jun 2024
Reference Answer
### (a) Types of Arc Welding Processes (8 Marks)
Arc welding is a process that uses an electric arc to create sufficient heat to melt and join metals. The arc is struck between an electrode and the workpiece. Several distinct processes exist, primarily differentiated by the type of electrode used and the method of shielding the weld pool from atmospheric contamination. The main types relevant to marine engineering are:
1. **Shielded Metal Arc Welding (SMAW) / Manual Metal Arc (MMA)**:
* **Principle**: Utilizes a consumable electrode, often called a "stick" or "rod," which is coated in a flux. The electric arc melts the core rod (filler metal) and the workpiece. The flux coating also decomposes, producing a shielding gas to protect the molten weld pool from oxygen and nitrogen, and forming a slag layer over the solidified weld to protect it as it cools.
Arc welding is a process that uses an electric arc to create sufficient heat to melt and join metals. The arc is struck between an electrode and the workpiece. Several distinct processes exist, primarily differentiated by the type of electrode used and the method of shielding the weld pool from atmospheric contamination. The main types relevant to marine engineering are:
1. **Shielded Metal Arc Welding (SMAW) / Manual Metal Arc (MMA)**:
* **Principle**: Utilizes a consumable electrode, often called a "stick" or "rod," which is coated in a flux. The electric arc melts the core rod (filler metal) and the workpiece. The flux coating also decomposes, producing a shielding gas to protect the molten weld pool from oxygen and nitrogen, and forming a slag layer over the solidified weld to protect it as it cools.
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