PRESENTED BY
ILAMVAZHUTHI.C
Under the guidance of
Mr.S.CHOKALINGAM M.E
(Assistant professor)
DEPARTMENT OF MECHANICAL ENGINEERING
E.G.S.PILLAY ENGINEERING COLLEGE
NAGAPATTINAN
1
Optimization of MIG and TIG Welding
Parameter To Increase The Tensile Strength
in HAZ Using Various Destructive ,Non
destructive test and Finet element analysis.

In this competitive world, the customers perceive the most
reliable high quality with low cost product. In order to satisfy the
customers demand, the manufacturing industries are being forced
to continuously optimize their process parameters. Gas metal arc
welding famously abbreviated MIG and TIG is one of the most
important metals joining process in manufacturing industries. The
selection of improper MIG and TIG process parameter increases
the power consumption, material consumption, man power and
cost of the product decreasing the weld quality. Here in our
project we are done a experiment with pure TIG welding for a root
and MIG welding for run to perform experiment

This project work is part of program for
the development of new EN8 and OHNS
steels to increase mechanical properties
and minimization of metallurgical defects
to increasing weldment. The quality of
weld in MIG and TIG mainly influenced
by independent variables such as welding
current, speed of electrode and electrode
stick out. The prediction of process
involved in MIG and TIG is a very
complex. NDT and DT can performed in
this research

Welding may be defined as the process of
joining similar or dissimilar metals by the
application of heat with or without addition
of filter metal in such a way that the result is
continuity of homogeneous material.



The customers perceive the most reliable high
quality with low cost product
The selection of improper MIG and TIG
process parameter increases the power
consumption, material consumption, man
power and cost of the product.
In this project we will be made many attempts
for made test pieces to predict parameter of
MIG for getting maximum surface finish,
tensile strength and min HAZ


Arc welding , Gas welding, Resistance
welding, Thermit welding
Arc welding
 Carbon arc
 Metal Arc
 MIG
 TIG
 Atomic hydrogen
 Plasma Arc
 Submerged Arc

In this type of arc welding the consumable
electrode is supplied continuously. The
electrode is vied as filler metal and to product
arc when DC supply is given, an electric arc is
produced between the consumable electrode
and the work piece. An inert gas like argon or
helium is passed at the welding place through
nozzle. The inert gas products a gas shield
around the electric arc. This prevents the
molten metal to react with atmospheric air.
The edges of the work piece are melted by the
electric arc and joined together to give weld.

Aluminium, Stain less steel, magnesium and
nickel alloys can be welded by this method
Advantages
No flux is needed
 Welding speed is high
 Quality welding joint can be obtained


This method is similar to MIG welding NonConsumable tungsten electrode is used. It
produces only electric arc. It can not be used
as filler metal. The tungsten electrode is fixed
in an electrode holder. When power supply
is given an electric arc is produced between
the tungsten electrode and the work piece.
An inert gas like argon (or) helium is passed
at the welding place through a nozzle. The
inert gas produces a gas shield around the
electric arc. The edges of work pieces are
melted by the electric arc and joined together
to give weld. The electrode will not be
melted during welding.



Aluminium, cast iron, steel and magnesium
can be welded by this method
Welding sheet metal and thinner sections
Aircraft, chemical and instrument industries
Rocket motor chemical and instrument
industries Rocket motor chamber fabrications
in launch vehicles.








MIG Welding Machine
Size of Filler Rod : 2mm
Filler Rod Material : Copper Coated Mild
Steel
TIG Welding Machine:
Amps
: 20 -300-AT/TIG
Tig
: 16 Amps /415v
Cooling
: Air cooling
Frequency
: 50Hz


EN8 – Unalloyed medium carbon steel
OHNS – Oil harden Non shrinking steel
Typical Analysis
EN8 :
C
0.40%
Si
0.25%
mn
0.80%
OHNS : C
Si
mn
0.40% 0.25% 0.70%
s
p
0.015% 0.015%
s
1.20%
p
0.30%


Destructive Testing
Non Destructive Testing
Non-Destructive Testing
Visual testing
 Penetrant Testing
 Electro Magnetic Testing
 Ultrasonic Testing
 Radiography Testing


Rockwell Hardware Test

Before Welding
 EN8  OHNS
25(average value)
16(average value)
Material : EN8&OHNS
Radio Graph No
V 17.5 / A 129
V 20.2 / A 183
V 25.0 / A 257