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Solid state additive manufacturing techniques, also known as solid-state 3D printing, are a group of additive manufacturing methods that use the solid-state phase transitions of materials to build up structures layer by layer. Unlike traditional 3D printing techniques that rely on melting or liquefying a material to create the desired shape, solid-state additive manufacturing techniques use heating and cooling to manipulate the properties of a solid material to add layers and build up a structure. These techniques can be used with a wide variety of materials, including metals, ceramics, and polymers. Some examples of solid-state additive manufacturing techniques include: Directed energy deposition: a technique that uses a focused energy source (such as a laser) to melt and deposit material onto a substrate. Ultrasonic additive manufacturing: a technique that uses ultrasonic vibrations to weld together layers of metal or plastic. Cold spray additive manufacturing: a technique that uses a high-pressure gas to accelerate solid particles onto a substrate, creating a uniform coating or a solid object. Solid-state additive manufacturing techniques are still relatively new and are still being developed, but they show promise for creating strong, precise, and lightweight structures that could be used in a variety of industries. In this paper we are discussing about the above mentioned one in detail.