This document discusses atomic hydrogen welding. It explains that atomic hydrogen welding uses an arc generated between two tungsten electrodes inside a hydrogen atmosphere. The arc is maintained separately from the workpiece and reaches temperatures of 11,000°F. This causes the diatomic hydrogen molecules to break down and recombine when hitting the workpiece, releasing energy. Annular nozzles around the electrodes carry the hydrogen gas. The process has advantages like concentrating an intense flame, less distortion, faster welding without needing separate flux or shielding gas. However, its cost is slightly higher than other processes and it is limited to flat positions. Atomic hydrogen welding is used for applications requiring rapid welding of stainless steels and special alloys.

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?