Abstract: A method of forming a hollow section body by deposition of a weld material includes the steps of providing a welding head 12 and a turntable 36 on which the body is to be formed, supplying a weld material to the welding head 12, the weld material to be deposited on the turntable 36 and connecting the turntable 36 and the welding head 12 to a supply of electricity to form an arc between the welding head 12 and the turntable 36 or the body to melt the material. The method includes the steps of manipulating the turntable 36 and the welding head 12 relative to one another to deposit material to form a first wall 40, manipulating the turntable 36 and the welding head 12 relative to one another to deposit material for form a second wall 42 extending from an angle to the first wall 40 and manipulating the turntable 36 and the welding head 12 relative to one another to deposit material to form a third wall 44 joining the first two walls, to form a hollow section body.