1. Arc Welding
Basic Safety

2. Warnings
Welding can be safe when proper measures are taken to protect yourself and others from potential hazards.
Understand and follow all warning labels found on equipment and with all consumables.

3. Potential Hazards
Protect yourself and others from potential hazards including:
Fumes and Gases
Electric Shock
Arc Rays
Fire and Explosion Hazards
Noise
Hot objects
Welding Sparks

4. Electrical Shock Electric shock can kill
Do not touch live electrical parts
Primary Voltage – , volt input power
Secondary Voltage – 6 to 100 volts for welding
Insulate yourself from work and ground
Follow all warnings on welding equipment
Wear insulated clothing
Always shut off machinery when done and roll the cords up neatly
Do not make repairs yourself, alert your instructor immediately!

5. U.V. Rays
Welding will produce ultraviolet rays that are harmful to the human eye and skin. Proper protection is needed to avoid bodily harm.
Arc rays are ten times brighter than the sun and can injure eyes and burn skin
Precaution must be taken to protect your eyes and skin from UV radiation. The welding arc is brighter than the sun
Wear correct eye and body protection
10 shade helmet
Safety Glasses under the helmet
Gloves
Arm and Body Protection
Jacket
Shoulder Covers
Coveralls

6. Fire Hazards and Material Safety
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
Always clean painted materials
All welding booths should be cleaned thoroughly
Have a fire extinguisher ready
Inspect area for fires 30 minutes after welding
Watch for sharp metal edges
Cool all welded metal in the water tank.

7. Ear Protection Loud noises can damage your hearing
Keep loud noises at a safe level by using proper hearing protection such as:
Ear plugs
Ear muffs

8. 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, shirts jackets, bibs, and fire-proof pants
Welding cap, helmet and safety glasses
Ear protection – ear plugs and muffs
Most importantly safety glasses are to be worn at all times in the shop

9. Improper Protective Clothing
List and describe
what is wrong
in this picture

10. Basic Electricity and Welding
Arc Welding
Basic Safety

11. Arc Welding Circuit and Concept
The electricity flows from the power source, through the electrode and across the arc, through the base material to the work lead and back to the power source.
Identify all the above parts for the arc welder, describe the function of each part, and determine each of the parts safety aspects.

12. Electrical Concepts
DC -
DC +
Voltage – The electrical potential or pressure that causes current to flow
Measured in Volts
Current – The movement of charged particles in a specific direction
Measured in Amps
Polarity
DC- (Direct Current Electrode Negative)
DC+ (Direct Current Electrode Positive)
AC (Alternating Current)
ALWAYS REMEMBER THAT VOLTAGE WILL HURT BUT AMPERAGE CAN BE FATAL AC

13. Electrical Lead Condition
Before starting an operation, always check the condition of all electrical leads.
Cracked and worn leads can lead to fatal shock.
All electrode holders or “stingers” should be in tack and not cracked or missing pieces.
All plugs and outlets should be in tack. Never set-up a welder with a broken plug or into a broken outlet.
Never operate a welder with splices showing in the leads.

14. Fumes and Gases
Welding fumes can be harmful to the welder causing implications such as:
Irritation of the respiratory tract
Metal fume fever
Slightly increase the risk of lung cancer
Use enough ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing zone and the general area
Use a respirator if needed or required by the process.
The ventilation system must be on while welding at all times.