Titanium can be welded with several arc-welding processes. One of the more common processes for joining titanium is gas tungsten arc welding (GTAW). Both GTAW and plasma arc welding (PAW) provide very high-quality welds but they require a . Titanium can be fabricated in much the same way as stainless steel and nickel-based alloys provided allowances are made for its properties. Some operations covered include welding, resistance welding, gas tungsten arc and gas metal arc welding as well as heat treatment. Titanium is a reactive metal; it will burn in pure oxygen at °C and in nitrogen at around °C. Oxygen and nitrogen will also diffuse into titanium at temperatures above °C raising the tensile strength but embrittling the metal. In the form of a powder or metal shavings titanium also constitutes a . CHAPTER 3 INTRODUCTION TO WELDING In the Navy as well as private industry, welding is widely used by metalworkers in the fabrication, main-tenance, and repair of parts and structures.
1. Welding of Titanium & its AlloysGene MathersTWI, UK, 2. Overview• Titanium is a reactive metal; it will burn in pure oxygen at °C and in nitrogen at around °C.• Oxygen and nitrogen will also diffuse into titanium at temperatures above °C raising the tensile strength but embrittling the metal.•. Welding. Once welding begins, the air itself becomes a contaminant to the molten titanium. Oxygen contamination is an extremely common cause of substandard welds. Not only the weld itself but the HAZ and root side of the weld must be shielded from air when their temperature rises to over °F. Usually, pure argon is the preferred shield gas. If time passes between the cleaning of the filler rod and the beginning of the welding process, place that filler rod in an air-tight container. If the filler rod has been left exposed, clean again before welding. 6. Clip the end of the filler rod just before you begin welding to expose pure, clean titanium for the beginning of your weld. Some parts need cooling to prevent the final assembly from being warped. Water cooling is used in the extreme, but sometimes an air cool or fan is specified. Some procedures will specify the length of bead that can be allowed (skip welding) and using the part as its .
To achieve the research purpose, Ti6Al4V titanium alloy plates with a thickness of mm were welded using pulsed Nd:YAG laser beam welding (LBW) and gas tungsten arc welding . welding on the final pro perties of the joints t which will lead to porosity and results into a poor welding conditions or welding defects. In regular air, welding contaminates titanium. Aside from having all the amenities for welding the most important variable is the welder. Not all welders can weld Titanium for various reasons. We had 21 of our welders + about 20 from a maintenance contractor that we screened for welding Titanium. From about 40 welders we got 5,one female, that showed proficiency in the welding Titanium. When welding higher strength titanium alloys, fillers of a lower strength are sometimes used to achieve adequate weld metal ductility. For example, an unalloyed filler ERTi-2 can be used to weld Ti-6Al-4V and Ti-5AlSn alloys in order to balance weldability, strength and formability requirements.