International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
PARAMETERIC OPTIMIZATION OF TIG WELDING ON JOINT OF STAINLESS STEEL(316) & MILD STEEL USING TAGUCHI TECHNIQUE. Kumar Rahul Anand1, Vijay Mittal2 1P.G.Scholar,Gateway 2Principal,Gateway
Institute of Engineering and Technology. Institute of Engineering and Technology.
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Abstract - As we know that the use of stainless steel in
tensile strength when root gap is higher side effect of joint angle. Ultimate Tensile Strength increase with increase in current. The formation of steel globules in copper matrix and copper globules in the fusion zone and delta ferrite phase in the austenitic grain boundaries at the SS side. R..Ramchandran [7] studied the various effect of the TIG welding on the Austenitic stainless steel 316L on micro structural changes through destructive and nondestructive method and various parameters such as tensile strength, hardness on varying the current, voltage and gas flow ratio respectively. N.Choudhury et al. [9] were carried out parameter optimization of TIG Welding of stainless steel and mild steel . The process parameters were current, gas flow rate and filler rod diameter. Statistical techniques analysis of variance (ANOVA), signal-to-noise (S/N) ratio and graphical main effect plots have been used to study the effects of welding parameters on ultimate load of weld specimen. Optimum parametric condition obtained by Taguchi method.
different industrial sector such as oil and gas, aerospace, automobile, power plant, manufacturing etc. is high due to their higher tensile strength and toughness etc. Therefore need has arrived to think out in the merger of stainless steel with other metal which are compatible and stronger such as stainless steel. So, in this paper we have studied the mechanical properties of the joint of austenitic stainless steel (AISI 316) and mild steel welded by TIG welding. In this paper with the use of Taguchi method of optimization we have tried to optimized the various process parameter such as current, voltage and gas flow ratio (GFR) which has influence on tensile strength and hardness of the joint. However, investigation is based on the Taguchi approach of orthogonal array using analysis of variance (ANOVA) to determine the influence of process parameter and to optimize them. Key Words: Austenitic Stainless steel, mild steel, TIG welding, Hardness ,Tensile strength.
2. METHODOLOGY
1.INTRODUCTION
a).Selection of base material (AISI 316 and Mild Steel). b).Process Parameter Selection (Welding Current, Arc Voltage, & Gas Flow). c).Sample Preparation ( Cutting, Welding etc.). d).Specimen for Tensile Test and Hardness Test. e).Result Analysis.
In the age of rising industrialization welding process is one of the most widely used process. A process known as TIG welding is also mostly used in the industries for better strength of weld which consist of non-consumable tungsten electrode, power source, shielding gas (mainly helium and argon) and filler material.
3. TAGUCHI METHOD
Sanjeev Gupta [1] performed the experiment to optimize the condition for performing the welding on Utra-90 specimen in which he varies the current and voltage while keeping the gas flow rate constant and observed that welding joint not made properly below 50A and above 200A since then burning of specimen stated. Ravinder & S.K.Jarial [3] studied the Parametric Optimization of TIG welding on stainless steel (202) and mild steel by using Taguchi method and found the control factor which had varying effect on the tensile strength, arc voltage having the highest effect and also found the optimum parameter for tensile strength current 80 A, Arc voltage 30 V and GFR 6 lt/min. Mrugesh Solanki & Ketan Shah [5] investigated and found successfully weld of copper and AISI 316 stainless steel with UTS at 229.600 and micro hardness is 134.214. The effect of root gap is there is slight decrease with increase in ultimate
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Genichi Taguchi a Japanese Scientist, developed a technique called Orthogonal Array which is mostly used in the manufacturing industries. The aim of this technique is to provide a high quality product at very low cost. Taguchi have orthogonal array through which the mean and variance of the process parameter get affected when different parameters is applied. However he provided equal weighted to each factor by this , Taguchi showed that the variability is caused by individual factor and that can be controlled individually. Regardless of the environment in which it is used this process is designed with the aim to produce consistent output. SIGNAL TO NOISE (S/N) RATIO Taguchi method stresses the importance of studying the response variation using the signal-to-noise (S/N) ratio,
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