Welding is the most economical and efficient way to join metals permanently. It is the only way of joining two or more pieces of metal to make them act as a single piece. Welding is vital to our economy. Welding ranks high among industrial processes and involves more sciences and variables than those involved in any other industrial process. Welding is the joining of metals. What welding does is join metals or other materials at their molecular level with the technology we have at the moment. More visit:- http://www.tradusway.com/electrical/welding.html/?p=2

1. WELDING
Connects Your World
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2. 2
Unit Topics
• Topics included in this
overview are:
– Introduction
• What is Arc Welding?
• Why is Welding Important?
• Why Learn to Weld?
– Careers in Welding
– The American Welding
Society (AWS)
– Welding Safety
– Basic Electricity
– Welding Fundamentals
– Welding Certification

3. 3
Objectives
• Upon successful completion of this unit of
study, you will be able to …
– Identify definitions and terminology
associated with welding
– Demonstrate safe working habits in the
welding environment
– Name the parts and types of welds and weld
joints
– Interpret basic welding symbol information
– Identify opportunities available to welders

4. 4
Why is Welding Important?
• Many things around us are welded …
– Pipelines that bring fresh water
– Towers that carry electricity to houses
– Cars and buses that take people where they
need to go

5. 5
Why Learn to Weld?
• Welding is so HOT …. it’s COOL!
– Welding can help build a successful career so you can
get the things you want in life
– Skilled welders are in demand – people use things
that are welded everyday!
– Welding can be fun and safe
– It is challenging and high-tech

6. 6
Basic Steps of Welding
• Prepare the base materials: remove paint and
rust
• Choose the right welding process
• Choose the right filler material
• Assess and comply with safety requirements
• Use proper welding techniques and be sure to
protect the molten puddle from contaminants
in the air
• Inspect the weld

7. 7
Careers in Welding
• Engineering
• Racing
• Industrial Sales
• Farm Repair and Fabrication
• Production Welding
• Military
• Teaching
• Maintenance
• Robotics
• Ironworker/ Skilled
Trades
• Auto Technician
• Artist
• Metal Sculpting
• Owning Your Own
Business
Job opportunities in welding are changing …
Welding can be valuable as a job skill or as a full-time job
For more information on welding careers, please see the e-
learning introduction

8. 8
• Welding can be safe when sufficient
measures are taken to protect yourself and
others from potential hazards
• Students should read and understand the
following before welding:
– Warning Labels
– Material Safety Data Sheets (MSDS)
• Students should also be familiar with the
following information
– ‘Safety in Welding, Cutting, and Allied Processes’
(ANSI Z49.1)
– Lincoln Electric’s ‘Arc Welding Safety’ (E205)
Welding Safety

9. 9
Welding Safety
• Protect yourself and
others from potential
hazards including:
– Fumes and Gases
– Electric Shock
– Arc Rays
– Fire and Explosion
Hazards
– Noise
– Hot objects

10. 10
Fumes and Gases
• Fumes and gases can be
hazardous to your health
• Keep your head out of the
fumes
• Use enough ventilation,
exhaust at the arc, or both,
to keep fumes and gases
from your breathing zone
and the general area
• See product labeling and
MSDS for ventilation and
respirator requirements

11. 11
Electric Shock
• Electric shock can kill
• Do not touch live
electrical parts
– Primary Voltage –230, 460
volt input power
– Secondary Voltage – 6 to
100 volts for welding
• Insulate yourself from
work and ground
• Follow all warnings on
welding equipment
Do not make repairs
yourself, alert your
instructor immediately!

12. 12
Rays
• Rays can injure eyes and burn
skin
• The welding arc is brighter
than the sun
• Precaution must be taken to
protect your eyes and skin
from UV radiation
• Wear correct eye and body
protection

13. 13
Fire and Explosion
Hazards
• Welding sparks can cause
fires and explosions
• Sparks and spatter from the
welding arc can spray up to 35
feet from your work
• Flammable materials should
be removed from the welding
area or shielded from sparks
and spatter
• Have a fire extinguisher ready
• Inspect area for fires 30
minutes after welding

14. 14
Noise
• Loud noises can damage your hearing
• Keep loud noises at a safe level by using proper
hearing protection such as:
– Ear plugs
– Ear muffs

15. 15
Protective Clothing
Welders must wear protective
clothing for
– Protection from sparks, spatter and UV
radiation
– Insulation from electric shock
• Protective clothing includes
…
– Fire-proof clothing without rolled sleeves,
cuffs or frays
– Work boots
– Welding gloves, jackets, bibs, and fire-proof
pants
– Welding cap, helmet and safety glasses
– Ear protection – ear plugs and muffs

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