welding operation for begineer in details

welding operation for begineer in details

1. SAFETY IN WELDING & GAS
CUTTING OPERATIONS
•Welding and Cutting are common industrial
operations.
•The associated hazards are Fire and
Explosion, Electric Shock, Burns, Exposure
to Radiation and Toxic Fumes and Gases.
• Operators are required to be fully
conversant with all Safe Practices.

2. SAFETY PRACTICES
Oxy-Acetylene Welding/Cutting
Equipment Check
Ensure that the tip of the torch is free from dirt
metal.
Move out any leaking cylinder immediately.
Check leaks around regulators, hoses/fittings &
nozzle with soap solution. Faulty equipment
should be changed immediately.

3. Equipment Set-up
Use trolley for Oxygen & acetylene cylinder
and chain them.
Arrange hoses to avoid tripping hazards.
Always use red hose for Acetylene and other Fuel
gases and black for Oxygen, and ensure that both are
in equal length.
Before attaching regulator to the cylinder, it is
necessary to shift the valve to blow out foreign
particles from the valve seat.

4. Equipment Set-up
Never use grease or oil on acetylene lines.
Attach Flashback Arrestors to each
regulator.
Select the proper welding/cutting nozzles.
Non-return valve should be installed in fuel
gas line.

5. Precautions
•Always stand back from the regulator when
opening the cylinder valve. Turn valve
slowly to avoid bursting of the regulator.
•Leave key wrenches on Cylinders in use, so
they can be closed quickly.
Do not use an Acetylene pressure greater
than 9 PSIG.

6. Precautions
•Use only a friction/spark lighter to light to
torch. Never use matches, hot metal or
welding arc.
•When leaving a Confined Space (Even if it
is only for a break or lunch), shut off the
gas supply.

7. Precautions
If you run out of gas, extinguish the flame
and connect the hose to the new Cylinder.
Purge the line before re-igniting the torch.
Purge the line before re-igniting the torch.
Purge regulators after welding work is over
and then turn off.

8. Electric Arc Welding
Equipment Check
Make sure that splices are at least 3M away
from the holder.
Regularly inspect insulation on electrode
holder, cables and accessories. Replace worn
& damaged cables immediately.
Ensure that cable and power sources are free
from dirt/grease.

9. Equipment Set-up
•Ground the work piece separately from the
welding return connection. Never attach the
ground cable to pipes containing flammable
liquids or gases.
Arrange cables so that they do not create
tripping hazards.
Cover the lug terminals to prevent shorting
out by a metal object.

10. Precautions
Use the current for which the cable is
designed.
Place electrode stubs in containers.
Burn electrodes to not less than 38 to 50
MM in length. Burning them further
damages the electrode holder.

11. Precautions
When job is finished, disconnect the
welding machine from the Power Source
and remove the electrode from its holder.
Store the electrode holder in a Safe place.

12. General Safety Precautions
Remove combustible materials from work
are or cover them with Fire –resistant
blankets (Asbestos Blanket) , before starting
the Welding Operations.
For Work in Confined Space, fasten
Cylinders/Welding machine securely
outside and provide proper ventilation.

13. General Safety Precautions
Use Welder’s screen of Correct
Specification.
Use all necessary Personal Protective
Equipment.