This Presentation covers the basic concepts of TIG welding and MAO methods. For more information, please refer the books mentioned in the references slide.... Thank you

1. Seminar On
MAGNETIC ARC OSCILLATION
WELDING
Melwin D’mello
M.E (Welding Engineering)
Centre for Materials Joining & Research (CEMAJOR),
Department of Manufacturing Engineering,
ANNAMALAI UNIVERSITY
Presented by

2. WELDING
 Welding is a materials joining process which
produces coalescence of materials by heating them to
suitable temperatures with or without the
application of pressure or by the application of
pressure alone, and with or without the use of filler
material. Welding is used for making permanent
joints.

3. TYPES OF WELDING

4. TIG WELDING
Also known as tungsten inert gas (TIG) welding.
 Is an arc welding process that uses a non-consumable
tungsten electrode to produce the weld.
 TIG welding has become a popular choice of welding
processes when high quality, precision welding is
required.

5. TIG WELDING
 With TIG welding we can perform a variety of weld
types on several different metals like Steels and
aluminum.
 The filler rod is usually made from the same material
as the base metal, it is used for reinforcing joints and
welding heavy metals.

6. TIG WELDING

7. TIG WELDING

8.  Tungsten inert gas (TIG) narrow gap welding using
magnetic arc oscillation is one of the most important
methods for joining thick components.
 Aimed at increasing a sophisticated process
understanding, especially concerning the physical
effect of arc behavior, which provide many strategies to
enhance weld prediction and joint quality
INTRODUCTION TO MAGNETIC ARC
OSCILLATION WELDING

9. MAGNETIC ARC OSCILLATION
WELDING SETUP

10. SCHEMATIC DIAGRAM
OF MAOW

11. CAPTURED IMAGES OF ARC SHAPE UNDER
DIFFERENT WELDING CONDITIONS

12. OSCILLATION DURING
WELDING - WHY?
 It assists the ironworker to achieve better weld toe
fusion, allowing his welds to transfer stress smoothly
in weldments.
 A welder, typically a pipefitter, will do this to
minimize body fatigue, increase bead width, and
improve bonding at the weld’s toe.
 A welder will be able to make a beautiful finish weld
with a consistent fact completely around the pipe
joint.

13. ELECTRICAL CHARGE MOVING THROUGH
A MAGNETIC FIELD
 It is important to review the basic electromagnetic effect that
governs the magnetic deflection phenomenon.
 If an electric charge travels within a magnetic field, it is
subjected to a magnetic force of magnitude proportional to its
velocity and magnetic field strength.

14. DEMONSTRATION OF ARC ACTION MARKS IN
SYNCHRONIZED MAGNETIC OSCILLATION.

15. MAOW TYPE WELDED JOINTS

16.  Right width of weld beads versus electromagnet voltage
(arc deflection) for different configurations of
GTAW with an average welding current of 150 A.

17.  Magnetic field “acting on the arc” versus electromagnet
voltage for an electromagnet-to-GTAW-electrode (arc
centre) distance of 15 mm and with the electromagnet
placed 3 mm above the test sample. Gas Tungsten Arc
Welding with Synchronized Magnetic Oscillation

18. ADVANTAGES
 The main advantage of using magnetic oscillation is the
virtually unlimited capability to create arc deflection
patterns, either sideways or forward and backward relative
to the direction of welding.
 In practical, the magnetic deflection is more adequate for
high frequency movements and with greater precision.
 The study on tungsten inert gas (TIG) narrow gap welding
using novel magnetic arc oscillation is able to promote the
development of heavy plate welding technology

19. LIMITATIONS
 Perhaps the destabilization of the arc in the presence
of strong magnetic fields is the main disadvantage of
using magnetic fields to oscillate welding arcs.
 These instabilities in the arc may even lead to its
extinction, even temporally
 The main reason for this phenomenon is linked to
magnetic fields generated by the arcs operating
adjacent to each other and the stiffness presented by
these arcs

20. APPLICATIONS
 Magnetic oscillation has been successfully used in GTAW for
grain refinement of titanium alloys
 By extending the amplitude of the magnetic field, we obtain
an increase of the weld bead width and were able to reduce
penetration.
 The process was satisfactory for carrying out hardfacing
with little penetration, surface smoothness, and good aspect
ratio (width/height).

21. REFERENCES
 Text Book : “Welding Process and Technology” by Dr.
R.S Parmar, 2015 edition.
 Text Book : “Welding Engineering and Technology” by
Dr. R.S Parmar, 2015 edition

22. THANK YOU