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MAURBHANJ SCHOOL OF ENGINEERING

BARIPADA : 757107 , ODISHA

CHAPTER – 02

TOPIC- WELDING

BRANCH- MECH.

SEMISTER- 3rd

SUBJECT- PRODUCTION TECHNOLOGY

FACULTY- ER KHAGESWAR PATRA

Estd:.1994

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CONTENTS

  • Welding
  • Types of Welding
  • Gas Welding (Oxy- Acetylene)
  • Arc Welding (Metal Arc)
  • Merits and Limitations of Welding Process
  • Applications
  • Conclusion

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WELDING

  • The welding is a process of joining two or more similar or dissimilar metals by heating them to a suitable temprature, with or without the application of pressure, filler materials and flux .
  • Welding is used for making permanent joints.

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TYPES OF WELDING

  • Plastic Welding or Pressure Welding: The piece of metal to be joined are heated to plastic state and forced together by external pressure

(Ex) – Resistance welding

  • Fusion welding or Non-Pressure Welding: The material at the joint is heated to a molten state and allowed to solidify

(Ex) – Gas welding, Arc Welding

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CLASSIFICATION OF WELDING PROCESS

  • Gas welding (Oxy – Acetylene)
  • Arc welding (Metal Arc)
  • Resistance welding
  • Solid state welding
  • Thermo – Chemical welding
  • Low temperature welding

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GAS WELDING

  • Gas Welding is a fusion welding process, in which the heat for welding is obtained by the combustion of orygen and fuel the gas may be Acetylene, hydrogen or propane.

Types:

  1. Ory- Acetylene
  2. Air- Acetylene
  3. Oxy- Hydrogen
  4. Oxy- Fuel

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OXY – ACETYLENE WELDING

  • When a combination of oxygen and Acetylene is used in correct proportions to produce an Intense gas flame, as oxy – Acetylene welding.

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ADVANTAGES AND DISADVANTAGES OF OXY- ACETYLENE GAS WELDING

Advantages :

  • Portable and most versatile process.
  • Better control over the temperature.
  • Suitable to weld dissimilar matter.
  • Law cost & maintenance.

Disadvantages :

  • Not suitable for heavy section.
  • Less working temperature of gas flame.
  • Slow rate of heating.

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ARC WELDING

  • Arc welding is a fusion welding process in which the heat required to fuse the metal is obtain from the electric arc between the base metal and an electrode.

Types :

  1. Metal Arc Welding
  2. Submerged Arc Welding
  3. Tungsten Inert Gas Welding
  4. Metal Inert Gas Welding

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EQUIPMENT

  • A welding generator (D.C) or Transformer (A.C.)
  • Two cables one for work and one for electrode
  • Electrode Holder
  • Electrode
  • Protective shieled
  • Gloves
  • Wire Brush
  • Chipping Hammer
  • Goggles

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METAL ARC WELDING

  • Uses an electric arc to coalesce metals
  • Arc welding is the most common method of welding
  • Electricity travels from electrode to base metal to ground

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ADVANTAGES AND DISADVANTAGES OF ARC WELDING

Advantages:

  • Most efficient way to join metals
  • Lowest cost joining method
  • Affords lighter weight through better utilization of materials
  • Joins all commercial metals
  • Provides design flexibility

Disadvantages:

  • Manually applied, therefore high labor cost
  • Need high energy causing danger
  • No convenient for disassembly.
  • Defects are hard to detect at joints

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APPLICATIONS

  • It is used in the manufacture of automobile bodies.
  • Aircraft Frames
  • Railway Wagons
  • Machine Frames
  • Structural works, tanks, furniture, boilers, general repair work and ship building etc.

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CONCLUSION

In these we learn about most popular welding type uses in industries

  • A good weld is always strong.
  • General welding equipment is not very costly
  • Portable welding equipment are available.
  • A large number of metal and alloy both similar and dissimilar can be join by welding.
  • Welding permits considerable freedom in design.

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Thank you

CREATED BY – ER KHAGESWAR PATRA