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1. St. Vincent Pallotti College Of
Engineering And Technology
Department Of Mechanical Engineering
Subject : Advanced Production Processes

2. •What?
•How??
•Why???
1

3. 2
Atomic Hydrogen
Welding

4. 3
Atomic Hydrogen
Welding

5. 4
Atomic Hydrogen
Welding•Arc generated between two tungsten
electrodes inside a hydrogen atmosphere
•Arc is maintained separately from the
work piece
•Temperatures of 11000F
•Diatomic Hydrogen molecules breakdown
under the heat of the arc and recombine
when they hit the work piece, releasing
energy.

6. 5
Atomic Hydrogen
Welding•Annular nozzles around the tungsten
electrodes carry the hydrogen gas
supplied from the gas cylinders.
•The arc is struck by bringing the
tungsten electrodes in contact with each
other and then separating them from a
small distance of about 1-1.5mm.

7. 6
Atomic Hydrogen
Welding

8. 7

9. 7

10. 9
Advantages
•Intense flame can be concentrated at the
joint.
•Less distortion.
•Welding is faster.
•Separate flux / shielding gas is not required. The
hydrogen envelop itself prevents oxidation of
the metal and the tungsten electrode. It also
reduces the risk of nitrogen pick - up.

11. 1
Disadvantages
Cost of welding by this process is slightly higher
than with the other process.
•Welding is limited to flat positions only.

12. 1
Applications
•Atomic hydrogen welding is used in
those applications where rapid welding is
necessary, as for stainless steels and
other special alloys.

13. 31
.THANK YOU.
Any Queries?