the method of forming a lining in the cavities of a body by application of powdered metal consolidated and bonded thereon by a hot isostatic pressing process . a space lining the cavities in the body is provided by tubular members , one intersecting with the other or in close spaced relation thereto , powdered metal fills the space , a vacuum is drawn on the space , the body is subjected to forming conditions and then the body cavities are machined to their final shape with such machining generally removing the tubular members .