The present work consists of welding fixtures which are designed for the components which are difficult to weld in normal way or without any holding unit. Researching the possibilities for fixture design optimization has been in the sphere of interest of a number of authors worldwide for a longer period. Fixture design process and fixture design technique with conventional methods have been obsolete. This paper presents a review of fixture design analysis and optimization in terms of fixture layout, clamping position and part deformation. In any given manufacturing industry lots of non-standard unit or components required to complete the given fixture. These non-standard unit are adding to the design cost and time, and also libraries for non-standard parts cannot be made which gives no other option than to redesign the given part or unit. These non-standard parts are required in all types of industries, like BIW, heavy, construction machinery, aerospace and rail. In this paper optimisation of this non-standard unit will be done.