International Journal of Engineering Trends and Technology (IJETT) – Volume 14 Number 1 – Aug 2014
Feasibility Study and Development of Inert
Oxy-Acetylene Gas Welding
a4
ᵃ1Abhishek Kumar, a2Satish, a3Ravi Kumar,
Adnan Farooqi, a5Priyesh Kumar, *6S.K. Gupta, #7Md. Ehsan Asgar
a
Department of Mechanical & Automation Engineering, HMR Institute of Technology & Management. New Delhi-36
Professor, Department of Mechanical & Automation Engineering, HMR Institute of Technology & Management. New Delhi-36
#
Assistant Professor, Department of Mechanical & Automation Engineering, HMR Institute of Technology & Management. New
Delhi-36
Shielding gases fall into two categories—inert or semi-inert.
ABSTRACT
Only two of the noble gas, helium and argon, are cost
effective enough to be used in welding. These inert gases are
A totally new welding technique namely Inert Oxyused in gas tungsten arc welding, and also in gas metal arc
Acetylene gas welding has been developed and tested. The
welding for the welding of non ferrous metal. Pure argon and
results are positive and encouraging. So far, some of the
helium are used only for some nonferrous metals. Semi-inert
materials which could not be welded now have been
shielding gases, or active shield gases, include carbon
welded besides with following factors as good quality,
better accuracy with speed and improved strength. The
dioxide, oxygen, nitrogen, and hydrogen. Most of these
Inert Gas is Introduce in the surrounding of Oxy
gases, in large quantities, would damage the weld, but when
Acetylene flame, Inert gas work as a shielding gas that
used in small, controlled quantities, can improve weld
protects the welding area by effect of atmospheric gases.
characteristics. [2]
Shielding gas is just there to protect the welding from the
effects of oxygen and nitrogen in the atmosphere. The
2 EXPERIMENTAL SETUP & PROCESS
following pages in the report includes about the
The research investigates the impact of inert gas (Argon) on
modification of Oxy-Acetylene Gas welding. Due to the
the performance of oxy-acetylene gas welding. In this
shielding (by Inert Gas) the flame temperature increases
concept, argon gas is supplied at periphery of the torch tip
as compare to Oxy Acetylene gas welding, this increase
surrounding the flame, which results in the improvement the
flame temperature give better hardness, weld quality etc.
performance of gas welding. In minimum constructional
Keywords: - Inert Gas (Argon), Oxy Acetylene Gas Welding
maintenance and running cost, this attempt is quite useful for
set, Oxy Acetylene Flame, Hardness tester, Universal Testing
industrial purpose. It is an innovative approach to increase
Machine, Fully designed nozzle.
the temperature of flame and hence increases the strength of
welding and also improves the chemical composition of
1 INTRODUCTION
welded structure.
Shielding gases are inert gases that are commonly used in
several welding processes, most notably gas metal arc
welding and gas tungsten arc welding (GMAW and GTAW,
more popularly known as MIG and TIG, respectively).
Their purpose is to protect the weld area from atmospheric
gases, such as oxygen, nitrogen, and water vapour.
Depending on the materials being welded, these atmospheric
gases can reduce the quality of the weld or make the welding
more difficult. Other arc welding processes use other
methods of protecting the weld from the atmosphere as well
shielded metal arc welding, for example, uses an electrode
covered in a flux that produces carbon dioxide when
consumed, a semi-inert gas that is an acceptable shielding gas
for welding steel. [1]
Improper choice of a welding gas can lead to a porous and
weak weld, or to excessive spatter; the latter, while not
affecting the weld itself, causes loss of productivity due to
the labour needed to remove the scattered drops.
*
Figure 1 - Inert Oxy Acetylene Welding Process
ISSN: 2231-5381
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International Journal of Engineering Trends and Technology (IJETT) – Volume 14 Number 1 – Aug 2014
3
MODIFICATION IN TORCH
5
In oxy-acetylene gas welding, a welding torch is used to weld
metals. Welding metal results when two pieces are heated to
a temperature that produces a shared pool of molten metal.
The molten pool is generally supplied with additional metal
called filler. [3] Filler materials depend upon the metals to be
welded by inert oxy acetylene welding. [4]
RESULT
After welding, we have performed different tests on the mild
steel work piece which are as follows:
Microstructure analysis
• Microstructure
of weld(100X)
The Modification in welding torch is done as following for
the passes of Inert gas in the periphery of oxy acetylene gas
flame.
• The structure
consist of grains
of pearlite and
ferrite.
Firstly, the cutting torch nozzle is selected which consist of
two separated parts, outer part and inner part
• Microstructure
of HAZ(100X)
• The structure
consist of grains
of pearlite and
ferrite.
• Microstructure
of Parent metal
• The structure
consist of grains
of pearlite and
ferrite.
Figure 2 - Inner and Outer part of Welding Cutting Nozzle
Grooved portion of the inner part was cut down to an
appropriate length by holding it on the lathe machine and
performing the cutting operation. Then the grooved part was
welded at the tip of welding nozzle. The outer part is then
drilled with a hole on its periphery at larger cross-section. A
Plane washer is then welded to the upper portion of the
nozzle modified in the previous step and then inserted in the
outer part of cutting nozzle in a manner that the washer
touches the end of the outer part and the whole is welded.
The remaining portion of the inner part is then welded in line
to the hole drilled in the outer part. It is welded for the supply
of inert gas.
ISSN: 2231-5381
Figure 4 - Micro Structure Analysis of Inert Oxy Acetylene Welding
Ultimate tensile strength
Dimensi
on (mm)
Area
Ultimate
Load
(N)
(mm2)
U.T.S
(mpa)
7560
19.20x1.
32
25.34
http://www.ijettjournal.org
Location
of
Fracture
298.3
4
Weld
Metal
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International Journal of Engineering Trends and Technology (IJETT) – Volume 14 Number 1 – Aug 2014
6 CONCLUSION
From the above result analysis it can be concluded that the
temperature of the Oxy-Acetylene Welding Flame has
increased by about 100°C, The Ultimate Tensile Strength of
the welded joint has been increased. The Chemical
Composition of the weld portion also has been improved.
The present innovative work is a step forward in the
development and utilisation of inert oxy-acetylene which will
open new areas of material to be welded with better quality,
better strength and better durability with faster speed? Hence
the developmental work has also been applied for patent by
five students of HMRITM, Hamidpur, New Delhi-110036 as
a part of fulfilment of Mechanical & Automation
Engineering, B.TECH.
ACKNOWLEDGMENT
We wish to express our profound gratitude to Prof. S K
Gupta, HOD, Department of Mechanical & Automation
Engineering, HMR Institute of Technology & Management
for introducing the present topic and for his inspiring
guidance, constructive criticism and valuable suggestions
throughout the project work.
We are also indebted to the management of “HMR Institute
of Technology & Management” for lending us various
resources and constant support throughout.
It is imperative to say that our research and experiment would
not have been successful without the immense help from the
above mentioned people.
REFRENCES
[1] Ramy Gadallah, Raouf Fahmy, Tarek Khalifa, Alber Sadek, Influence of
Shielding Gas Composition on the Properties of Flux-Cored Arc Welds of
Plain Carbon Steel, Mechanical Engineering Department, Faculty of
Engineering at Shoubra, Benha University, Cairo, Egypt.
[2]
“Shielding
gas”,
Wikipedia,
the
<http://en.wikipedia.org/wiki/Shielding_gas>
free
[3]
“Oxy-acetylene
gas
welding”,
<http://en.wikipedia.org/wiki/Oxy-fuel_welding_and_cutting>
encyclopaedia
Wikipedia,
[4] The Oxy-Acetylene Handbook, Union Carbide Corp 1975.
[5]http://www.mextech.co.in/infrared-thermometer.
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