Introduction
Welding is a process of joining two or more parts of metal. It
provides a permanent joint. Most of the materials can be welded by
one process or the other. Welding is comparatively a new comer
amongest the fabrication processes. Though there are a number of
well-established welding processes but arc welding with coated
electrodes is still the most popular welding process in all over
the world.
Arc welding in its present form started in 1880's however, the
demand for large scale production of heavy items like ships,
pressure vessels, construction of bridges etc. provided the
necessary impetus for welding to come of age.
Welding processes widely used in the industry include
Oxy-acetylene as manual metal arc required welding.
Objectives
After going through this course the student will be able
to:
understand Gas and Arc Welding processes to join metal pieces for
various applications in industry.
carry out skillfully Gas and Arc Welding Processes to join
materials for different applications in Industry.
Job Oppurtunities
The pass outs of this programme have ample scope for self
employment, as there is sufficient market demand for trained and
skilled technicians in Gas and Arc Welding. They can also get wage
employment as welder in private and government sector industries,
Research & Development Organisations, Defence Sector, I.T.I.s
and Vocational Training Institutes etc.
Course duration
One Year
Scheme of study
Theory - 40%, Practical - 60%
Entry Qualification
Class 8th Pass
Scheme of Evaluation
Maximum Weightage in Theory-30% Time - 2 hours
Maximum Weightage in Practical-70% Time - 3 hours
Passing Criteria - 33% aggrigate in Public Examination in
secondary level or Grade 'E' as for independent vocational course
or Grade 'G' when combined with academic stream.
Course Content
- Importance of Welding and its application in industry and rural
areas. Safety in manual Metal Arc Welding. Safety in Oxy-Acetylene
welding and cutting. Elementary knowledge of working &
measuring tools.
- Gas and Arc welding equipment, their uses, care and
maintenance.
- Different processes of metal joint - bolting, rivetting,
soldering, brazing and welding.
- Oxy-Acetylene welding and cutting equipment and their
application
- Common gases used for Welding - Oxygen, Hydrogen and Acetylene.
Type of Oxy-Acetylene flames their Setting and uses. Various gas
combinations, flame temperatures and their uses.
- Types of welding joints - Explanation with simple sketches
- Acetylene - its properties and dissolved Acetylene in
cylinder
- Oxygen - its properties and Oxygen cylinders, Safety
precautions in handling cylinders.
- Regulators and Welding blow pipes, types, construction and
uses.
- Defects in Gas and Arc welding.
- Welding of Aluminium, Flame and angle of blow pipe, Filler rod
and Flux.
- Welding of dissimilar metals, Flame setting, use of filler rod
and flux, Precautions.
- Different flame cutting equipment, manual and machines, Flame
setting for Mild Steel. Precautions to be observed during
cutting.
- Different Arc Welding processes.
- Polarity and its importance in Arc Welding and its
application.
- Welding positions - Flat, Horizontal, Vertical and
Overhead.
- Electrodes, Types of Flux coating, Precautions in handling
& storage of electrodes.
- Cast Iron - its properties and welding.
- Copper - its properties and welding
- Inspection and testing of welds, Destructive and Non
Destructive tests.
- Introduction to Advance Welding methods
- Submerged Arc Welding
- Tungsten Insert Gas Welding
- CO2 Welding
- Electron Beam Welding
- Friction Welding
- Arc Brazer
- Thermal welding
- Resistance welding