Mathematical Analysis & FEA Simulation for Effect of Throat Thickness on Mig Welded Joint Strength

International Journal of Research and Scientific Innovation (IJRSI) | Volume VI, Issue IX, September 2019 | ISSN 2321–2705

Mathematical Analysis & FEA Simulation for Effect of Throat Thickness on Mig Welded Joint Strength

Er. Saurabh Gandhe¹; Prof. V.S Aher²; Prof. Dr. V.D. Wakchaure³

¹Amrutvahini College of Engineering, Sangamner, Ahmednagar District, Maharashtra, India
²Professor, Mechanical Engineering, Amrutvahini College of Engineering, Sangamner, India
³HOD, Mechanical Engineering, Amrutvahini College of Engineering, Sangamner, India

Abstract: Energy storage device is a very critical electrical component used at converter of the many locomotives. The energy storage devices are made up of AISI 1040 steel cases or boxes. Bulging effects in these boxes exerts tensile load on welded joint and breaks them. AISI 1040 is having good weld ability. The boxes of these materials are joined with MIG welding with the filler metal of ER 70S-6. In order to improve its tensile strength the throat thickness of the weld was insufficient. By increasing throat thickness strength of the joint will also improves. In this paper the effect of increasing throat thickness on the tensile strength of the joint is analyzed by using theoretical design equations. It is then simulated in the ANSYS software to confirm these effects. From result it is seen that increase in throat thickness will improve the tensile strength of the joint. It is also seen that the maximum stress acts at the area adjacent to the weld and stresses at weld are much lesser than the UTS of filler metal and just less than yield strength of the filler metal with higher throat thickness.

Keywords: AISI 1040, ER 70S-6, ANSYS, Throat thickness, UTS, Yield.

I. INTRODUCTION

MIG welding which is also called as GMAW. i.e. Gas metal arc welding is used to join the case of capacitor. In this type of welding a wire from reel is fed through a torch which is in contact with base metal & which supplies a current. The wire melts & converts into pool by arc. The welding arc is protected by shield gas. It is necessary to avoid oxidation of weld pool. Coating is given on electrode wire in order to produce a smoke which is also acts like a shield. Depending on the shielding gas process is divided into two types: i) MIG (Metal Inert gas) ii) MAG (Metal Active Gas). In Metal active gas welding a reactive gas like carbon dioxide (CO2) is used to protect the weld while MIG welding used an inert gas like argon. Generally MIG welding is applied for aluminum, copper, stainless steel and high alloyed steel, metal transfer in the MIG welding is done by two methods: spray arc & short circuiting arc. In spray arc process an arc is introduced in between welding wire & work piece.

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