IJSART - Volume 3 Issue 8 –AUGUST 2017 ISSN [ONLINE]: 2395-1052 Page | 361 www.ijsart.com A review of (GTAW) Gas Tungsten Arc Welding and its Parameters for Joining Aluminum Alloy Mr. A. D. Sarolkar 1 , Dr. K. P. Kolhe 2 1, 2 Department of Mechanical Engineering 1, 2 JSPM ICOER, Wagholi, Affiliated to Savitribai Phule Pune University, Pune, Maharashtra Abstract- There are number of welding methods available for joining of engineering materials, such as shielded metal arc welding, Gas metal arc welding, Flux cored arc welding, submerged arc welding, electro slag welding, electron beam welding, and Gas Tungsten arc welding methods. The choice of the welding depends on several factors; primarily among them are the compositional range of the material to be welded, the thickness of the base materials and type of current. GTAW is the most popular gas shielding arc welding process used in many industrial fields like Aircraft industries, Farm Machineries etc. Other arc welding processes have limited quality when they are compared to TIG welding processes. However, TIG welding also needs improvements regarding spatter reduction and weld quality of the bead. Shielding gas in TIG welding is desirable for protection of atmospheric contamination. TIG welding process has the possibility of becoming a new welding process giving high quality and provides relatively pollution free. This paper reviews the introduction of GTAW, various gases used in GTAW, Application of GTAW and its process parameters for joining alluminium alloy. Keywords- gas tungsten arc welding, process parameter, Application of GTAW etc. I. INTRODUCTION GTAW or TIG welding process is an arc welding process uses a non consumable tungsten electrode to produce the weld. The weld area is protected from atmosphere with a shielding gas generally Argon or Helium or sometimes mixture of Argon and Helium. A filler metal may also feed manually for proper welding. GTAW most commonly called TIG welding process was developed during Second World War. With the development of TIG welding process, welding of difficult to weld materials e.g. Aluminium and Magnesium become possible. The use of TIG today has spread to a variety of metals like stainless steel, mild steel and high tensile steels, Al alloy, Titanium alloy. Like other welding system, TIG welding power sources have also improved from basic transformer types to the highly electronic controlled power source today. The Gas Tungsten arc welding system set up is illustrated in figure 1.1 here. Shielding gas is fed through the torch to protect the electrode, molten weld pool, and solidifying weld metal from contamination by the atmosphere. A constant-current welding power supply produces energy that is conducted across the arc through a column of highly ionized gas and metal vapors known as plasma. TIG provides the welder with greater control over the weld than competing procedures such as shielded metal arc welding (SMAW) and gas metal arc welding (GMAW), thus allowing for stronger, higher quality welds. However, GTAW/TIG is comparatively more complex and difficult to master closer tolerance requirements and filler metal usually added by other hand, and is significantly slower than most other welding techniques as well. It will also cover core competencies such as setting up equipment, preparing materials, fitting up, starting an arc, welding pipes and plates, and repairing welds. Figure 1. Schematic Diagram of TIG Welding System or set up II. LITERATURE REVIEW 1) Mohd. Shoeb, Prof. Mohd. Parvez and Prof. Pratibha Kumari studied the various welding parameters such as welding speed, voltage and gas flow rate on HSLA steel. The effects of these parameters on weld bead geometry such as penetration, width & height have been studied. They also investigated the MIG welding was carried out on DC electrode (welding wire) positive polarity (DCEP). However DCEN in used (for higher burn off rate) with certain self- shielding and gas shield cored wires.