International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 07 | July 2022
p-ISSN: 2395-0072
www.irjet.net
EXPERIMENTAL OPTIMIZATION OF MILD STEEL ON TIG WELDING Sheet Kumar1, Dr. Mohd. Shadab Khan2, Dr. Mohd. Anas3 1M.techStudent,
Mechanical Engineering Dept, Integral University, Lucknow, UP India Professor, Mechanical engineering Dept, Integral University, Lucknow, UP, India 3Associate Professor, Mechanical engineering Dept, Integral University, Lucknow, UP, India ---------------------------------------------------------------------***--------------------------------------------------------------------2. LITERATURE REVIEW Abstract - Tungsten Inert Gas welding is also known as Gas 2Associate
Tungsten Arc Welding (GTAW), is an advance arc welding process become a popular choice when a high level of weld quality or considerable precision welding is required. However, the major problems of TIG welding process are its slow welding speed and limited to lower thickness material in single pass. In this work, autogenous. TIG welding has been performed on 5 mm thick AISI 1020 mild steel plate without using any filler material. Wide range of welding current and scan speed has been tested for obtaining a full penetration welding. Activated flux has also been used to improve the weld depth. After performing welding by maintaining different gap between the plates to be welded, weld bead geometry and tensile strength of the weld has been investigated. It is observed that, by maintaining an appropriate gap full penetration welding of plate is possible which gives strength almost similar to base material.
TIG welding is widely used for different types of metal & alloy and still lots of research work is going for better performance by TIG welding process. Krishnan et al. [1] done experiment to analyze the microstructure and oxidation resistance at different regions in the mild steel weld by TIG welding. During welding process a sharp change in the microstructure due to complex thermal cycle and rapid solidification was observed. This micro-structure change also affects the mechanical properties and oxidation resistance of the mild steel weld. Autogenous TIG welding was performed on 12 mm thick mild steel with 200 A current, 19 V voltage and 100 mm/min welding speed. Finer grain size was obtained at weld metal and heat affected zone.
1. INTRODUCTION
Raj and Varghese [2] predict the distortion developed during TIG welding of low carbon steel. In their study, have developed three dimensional finite element model like longitudinal, angular or transverse distortion. Distortion in welding produced due to non-uniform heating and cooling. To validate the model welding was performed with welding current 150 A, electrode gap 3 mm, gas flow rate 25 l/min, electrode diameter 0.8 mm and Argon as shielding gas. They concluded that, maximum distortion occurs at surface opposite to the weld and along X direction of weld compare to other two directions.
Welding is a process of joining two similar or dissimilar metals by fusion, with or without application of pressure and with or without use of filler metal. Weldability of the material depends upon various factors like the metallurgical changes that occur due to welding, change in hardness of material, in and around the weld and the extent of cracking tendency of the joint. A range of welding processes have been developed so far using single or combination of factors like pressure, heat and filler material used.
1.1 WORKING PRINCIPLE
Abhulimen and Achebo [3] performed experiments to identify the economical welding parameters using Response surface methodology (RSM) during TIG welding of mild steel pipe. Welding Parameters considered were gas flow rate 25 to 30 l/min, welding current 130 to 180 A, arc voltage 10.5 to 13.5 volt and argon as shielding gas. Results showed that, by using TIG welding of mild steel maximum tensile and yield strength of 542 MPa and 547 MPa was achieved respectively.
In TIG welding process, the terminal is non-consumable and motivation behind it just to make a circular segment. The warmth influenced zone, liquid metal and tungsten anode are completely protected room air tainting by a cover of idle gas took care of through the GTAW light. Fig. 1 shows schematic graph of the working guideline of TIG welding process. Welding light comprise of light weight handle, with arrangement for holding a fixed tungsten terminal. In the welding light, the protecting gas streams by or along the terminal through a spout into circular segment area. An electric circular segment is made among terminal and the work piece material utilizing a consistent flow welding power source to deliver vitality and led over the bend through a segment of profoundly ionized gas and metal fumes. The electric curve produce high temperature and warmth can be engaged to malt and join two unique pieces of work piece.
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Mishra et al. [4] have done comparison of mechanical properties between TIG and MIG welded dissimilar joints. Mild steel and stainless steel dissimilar material joints are very common structural application. These dissimilar joints provide good combination of mechanical properties like corrosive resistance and tensile strength with lower cost. Welding parameters considered for MIG welding were welding current 80-400 A and voltage 26-56volt. TIG
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