Types of welding processes and application

Oxy-acetylene welding plant- description, operating procedures, safety

• Safety precautions in handing oxy-acetylene gas welding plant
• Flashback and backfire

Types of oxy-acetylene flames and their uses

• Types of metals and Charcteristice
• Properties of metals
• Identification of different metals in workshop tests and their characteristics
• Chemistry of oxy-acetylene flame
• Gases used for welding and gas flame combinations

Basic electricity as applied to welding

• Shielded metal arc welding, its advantages and limitations
• Arc welding machines
• Arc welding accessories and tools

Safety precautions in manual metal arc welding

• Principle of welding arc, its characteristics and Arc length
• Arc length and its effects
• Metal transfer across the arc (Characteristics of arc)

Welding technique of oxy-acetylene welding

• Rightward technique of oxy-acetylene gas welding
• Filler rods used in gas welding
• Filler rods for gas welding

Welding regulator

• Welding blowpipe

Types of welding joints and edge preparations

• Types of welds
• Methods of cleaning the base metals before welding
• Edge preparation
• Welding positions and their significance

Principle of oxy Acetylene cutting process

• Oxy-acetylene cutting equipment and selection of blow pipe size pressure setting for various thicknesses of MS plates

Polarity in DC Arc welding – types and application

• Types and functions of smaw electrodes and coating factor
• MS Welding Electrodes
• Coding of SMAW electrodes as per BIS/AWS

Choice and storage of electrodes

Metal and their Weldability

Soldering, brazing

Silver soldering

• Faults in gas welding
• Weld defects- Causes and remedies
• Defects in Arc welding – its effect
• Defects in Arc welding – definition, causes and remedies

Arc blow and its control

Distortion and methods of control

• Distortion in gas welding

Necessity of preheating and post heating while welding alloy steels

• Welding of low, medium and high carbon steels by arc
• Welding method of low carbon steel and medium carbon steel

Inspection and testing of welding

• Effect of variations in welding procedure on the welds in SMAW
• Methods of Non- destructive tests
• Destructive test

Arc power source, AC Transformers, DC welding generator, DC welding rectifiers and features

• Advantage and disadvantages of AC and DC welding

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