ANS:A - TIG welding.

Titanium alloys are often welded using the TIG (Tungsten Inert Gas) welding process. TIG welding, also known as gas tungsten arc welding (GTAW), is a commonly used method for welding titanium and its alloys. In TIG welding, a non-consumable tungsten electrode is used to create the welding arc, while a shielding gas (typically argon or helium) is used to protect the weld area from atmospheric contamination. This process allows for precise control over the welding parameters, resulting in high-quality welds with minimal heat input and distortion. While other welding processes such as submerged arc welding, butt welding, and electron beam welding can also be used for welding titanium alloys in specific applications, TIG welding is often preferred for its versatility, control, and ability to produce high-quality welds in a wide range of thicknesses and configurations.