A T-joint is a type of joint used in welding and metal fabrication where two pieces of material meet at a right angle, forming a "T" shape. This joint is commonly found in structures and frames, providing strength and stability. T-joints can be made from various materials, including steel and aluminum, and are often used in construction and manufacturing. In welding, T-joints can be joined using different techniques, such as MIG welding or TIG welding. The choice of method depends on the materials and the desired strength of the joint. Proper preparation and technique are essential to ensure a strong and durable connection.