Exam Question
(a) Describe types of arc welding processes. (8)
(b) Describe what level of temperatures are reached during are welding. (4)
(c) Describe precautions taken to avoid health and shock hazards during welding. (4)
Class 4 (4th Engineer)
MEP
📅 Nov 2024
Reference Answer
### (a) Types of Arc Welding Processes
Arc welding is a process that uses an electric arc to create sufficient heat to melt and join metals. The arc is formed between an electrode and the base material. The primary types of arc welding processes commonly used in marine engineering are distinguished by their electrode type and shielding method.
**1. Shielded Metal Arc Welding (SMAW) / Manual Metal Arc (MMA) Welding**
* **Principle:** An electric arc is struck between a flux-coated consumable electrode and the workpiece. The intense heat of the arc melts the electrode tip and the surface of the workpiece, forming a molten weld pool. The electrode's flux coating decomposes in the arc, providing a gaseous shield to protect the weld pool from atmospheric contamination and forming a layer of slag to protect the cooling weld bead.
Arc welding is a process that uses an electric arc to create sufficient heat to melt and join metals. The arc is formed between an electrode and the base material. The primary types of arc welding processes commonly used in marine engineering are distinguished by their electrode type and shielding method.
**1. Shielded Metal Arc Welding (SMAW) / Manual Metal Arc (MMA) Welding**
* **Principle:** An electric arc is struck between a flux-coated consumable electrode and the workpiece. The intense heat of the arc melts the electrode tip and the surface of the workpiece, forming a molten weld pool. The electrode's flux coating decomposes in the arc, providing a gaseous shield to protect the weld pool from atmospheric contamination and forming a layer of slag to protect the cooling weld bead.
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