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Paper on Comparision of Conventional Welding Methods with Solid-State Welding Techniques International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 10 | Oct -2016 www.irjet.net p-ISSN: 2395-0072 PAPER ON COMPARISION OF CONVENTIONAL WELDING METHODS WITH SOLID-STATE WELDING TECHNIQUES 1V. prasanna Associate Professor ,Department of Mechanical Engineering, NITS, Hyderabad 2S. Narsing Rao , DGM Midhani, Hyderabad --------------------------------------------------------------------------------------------------------------------------------- Abstract:-The aim of the present study was to compare Arc welding (AW) Friction Stir Welding (FSW) method which is an innovative It is a fusion welding process in which heating of metals is solid-state welding technique with conventional welding accomplished by an electric arc. In most arc welding methods. Nowadays, the technologies are toward eco- processes, filler metal is added during the operation to friendly system. The eco-friendly systems represent increase the volume and strength of the weld joint. As the reduction the potential threat and waste to the earth. electrode is moved along the joint, the molten weld pool Friction Stir Welding (FSW) is a new kind of welding solidifies in its wake. method that was invented by The Welding Institute (TWI). It is different from conventional welding methods and also Resistance Welding (RW) different from other old solid welding process. The method It utilizes a combination of heat and pressure to utilizes rotating welding tools to generate friction heat for accomplish coalescence. The heat required is generated heating the parent metal until the metal merge. The by electrical resistance to current flow at the interface of process is called Solid-state joining process, which is the two parts to be welded. original metal characteristics have not changes. Solid-state welding Keywords: Solid-state Welding, Friction Stir Welding, Joining takes place without fusion at the interface, when Conventional Welding, Solidification two surfaces brought together no liquid and molten phase present at the joint. The most broadly used welding 1. INTRODUCTION TO WELDING processes are Solid-state welding category, which can be Welding is a process of joining two or more pieces of the organized in to the following general groups. same or dissimilar materials to achieve complete Diffusion welding coalescence. This is the only method of developing Friction welding monolithic structures and it is often accomplished by the Ultrasonic welding use of heat and or pressure. There are two groups of welding processes Diffusion welding according to the state of the base material It is a solid-state welding process which produces Liquid-state Welding (Fusion Welding) and coalescence of the faying surfaces by the application of Solid-state Welding pressure and elevated temperatures. Temperatures are well below the melting points of the metals and plastic Fusion Welding deformation at the surfaces is minimal. The process is In fusion welding the base material is heat to melt. No used quite extensively for joining dissimilar metals and filler metal is added in the fusion welding operation used primarily by the aircraft and aerospace applications. which is referred as autogenously weld. Fusion welding is far by more important category as. Friction welding Oxy-fuel gas welding It is a process which produces coalescence of materials by Arc welding and the heat obtained from mechanically-induced sliding Resistance welding motion between rubbing surfaces. The work parts are Oxy-fuel gas welding (OFW) held together under pressure. This process usually It is the term used for cutting and to separate metal plates involves the rotating of one part against another to and other parts. A mixture of oxygen and acetylene and generate frictional heat at the junction. Then the parts are filler metal is used to produce a flame to melt the base driven toward each other with sufficient force to form a material. It is economical, versatile process that is well metallurgical bond. suited to low-quantity production and repair jobs. © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 315 International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 10 | Oct -2016 www.irjet.net p-ISSN: 2395-0072 Ultrasonic welding Is a process which produces coalescence by the local Cracks application of high-frequency vibratory energy as the The type of cracks occurred are typically longitudinal, work parts are held together under pressure. Welding transverse, crater, toe cracks Fusion –line, root and under occurs when the ultrasonic tip or electrode, the energy bead. This can occur due just to thermal shrinkage or due coupling device, is clamped against the work pieces and is to a combination of strain accompanying phase change made to oscillate in a plane parallel to the weld interface. and thermal shrinkage. In the case of welded stiff frames, Most ductile metals can be welded together and there are a combination of poor design and inappropriate many combinations of dissimilar metals that can be procedure may result in high residual stresses and welded. cracking. 2. Weld defects in conventional welding Surface Damage processes During welding, some of the metal may spatter and Most defects encountered in welding are due to an deposited as small droplets on adjacent surfaces. Example improper welding procedure. in arc welding, the electrode may inadvertently contact The major defects or discontinuities that effect weld the parts being welded at places not in the weld zone. quality are below. Such surface discontinuities may occur at the weld part. Porosity Under proper welding techniques and procedures is Slag Inclusion important in avoiding surface damage. Incomplete Fusion Penetration 2.1 Drawbacks of Existing Conventional Welding Weld Profile 1. Fusion welding processes generates fumes, gases Cracks and or smoke which may cause harmful effects on operators. Surface Damage 2. In fusion welding process, possibility of porosity The above listed defects are discussed briefly, and slag inclusions are more. Porosity 3. Less process efficiency with high energy Porosity is gas pores found in the solidified weld bead. consumption. These pores are generally distributed in a random 4. Welding of dissimilar alloys and complex shapes is manner. However it is possible that porosity can only be difficult. found at the weld centre. Pores can occur either under or 5. Heat affected zone is more. on the weld surface. The most common causes of porosity 6. Distortion of work pieces and spatter is the most are atmosphere contamination. common problem in fusion welding. The defects and drawbacks in Conventional Slag Inclusion welding processes can be effectively overcome by Slag is normally seen as elongated lines either continuous adopting new solid state welding technique called friction or discontinuous along the length o the weld. Slag stir welding. inclusions are usually associated with the flux processes. Inclusions: Welding conditions are important and with 3. FRICTION STIR WELDING proper techniques the molten slag will float to the surface 3.1 Introduction of the molten weld metal and not be entrapped. Friction Stir Welding (FSW) is a new joining and Solid state welding process. It overcomes many of the problems Incomplete Penetration associated with conventional methods. FSW basic concept Welding current has the greatest effect on penetration. creates extremely high-quality, high-strength joints with Incomplete penetration is usually caused by the use of too low distortion. It is different from low a welding current and can be eliminated by simply increasing the amperage. Other cause can be the use of too slow travel speed and an incorrect torch angle. Both will allow weld metal to roll in front of the arc,acting as a cushion to prevent penetration. Weld Profile or Unacceptable weld Profile Weld profile is important because it can indicate incomplete fusion or the presence of slag inclusions in multi-layer welds. Unacceptable profile can include any of the following: weld too small (not enough fill), weld to flat, excessive weld fill, uneven weld profile, excessive concavity or convexity, or excessive surface roughness. © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 316 International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 10 | Oct -2016 www.irjet.net p-ISSN: 2395-0072 where the tool rotation direction is the same as the tool travel direction (opposite the direction of metal flow). The retreating side is on the right, where the tool rotation is opposite the tool travel direction (parallel to the direction of metal flow). Fig: 1 Profile of Friction Stir Welding A non consumable rotating tool with special Fig: 2 Friction Stir Welding Tool pin and shoulder id inserted into abutting edges of sheets The tool shown in fig.2 serves three primary functions: or plates. FSW produces welds of high quality in difficult- 1. Heating of the work piece to-weld materials such as Aluminium and its alloys, 2. Movement of the material to produce the joint, copper, Brass, Magnesium, Titanium, Steel alloys, and Stainless steel, Tool steel, Nickel and Lead. 3. Containment of the hot metal beneath the tool FSW is considered to be the most significant shoulder development in metal joining in a decade. Recently, Heat is generated within the work piece both by friction friction stir processing (FSP) was developed for micro between the rotating tool pin and shoulder and by severe structural modification of metallic materials. plastic deformation of the work piece. The localized 3.2 Background of FSW heating softens material around the pin and, combined In 1991 a novel welding method (FSW) is invented by with the tool rotation and translation, leads to movement Wayne Thomas at The Welding Institute (TWI) Ltd at of the material from the front to the back of the pin, thus England. It is further developed New Friction Stir filling the hole in the tool wake as the tool moves forward. Technique for Welding Aluminium, in 1992 to study this The tool shoulder restricts metal flow to a level technique.
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