Taguchi Optimization of MIG Welding Parameters Affecting Tensile Strength of C20 Welds

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2015 by IJETT Journal
Volume-26 Number-1
Year of Publication : 2015
Authors : Diganta Kalita, Parimal Bakul Barua
  10.14445/22315381/IJETT-V26P209

MLA 

Diganta Kalita, Parimal Bakul Barua"Taguchi Optimization of MIG Welding Parameters Affecting Tensile Strength of C20 Welds", International Journal of Engineering Trends and Technology (IJETT), V26(1),43-49 August 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
The objective of this research work is to investigate the effect of the three process parameters of Metal Inert Gas Welding (MIG), welding current, voltage and shielding gas flow rate on tensile strength of welded joints having Grade C20 Carbon Steel as parent metal and ER70S-4 electrode. An experiment has been designed using Taguchi’s Orthogonal Array L9, taking welding current, voltage and shielding gas flow rate as factors having three levels each. The selected levels for welding current are 170 A, 200 A, 230 A and for voltage are 20 V, 25 V, 30 V and for shielding gas flow rate (CO2) are 8 lit/min, 12 lit/min, 16 lit/min. The experiments were conducted using TORNADO MIG 400 welding machine with three repetitions. ANOVA analysis of the experimental results shows welding current and welding voltage have significant effect whereas gas flow rate has insignificant effect on tensile strength of the weld. The optimal set of process parameters for optimal tensile strength (475.87 N/mm2) found to be are: 200 A welding current, 30 V welding voltage and 8 lit/min gas flow rate. The effect of shielding gas flow rate being found insignificant, kept at the most economic level (8 lit/min).

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Keywords
MIG Welding, Taguchi Technique, Tensile Strength.