Expanded cooling jacket assembly

摘要

A method of manufacturing a cooling jacket (10) is provided whereby a relatively thin-walled outer jacket formed as a cylinder (14') is press-fit over an inner casing (12) and the outer jacket (14') is then electron-beam welded to the inner casing (12) to set up a spiral weld (28) along the length of the cylinder (14'). The inner casing (12) has an inlet (18) and an outlet (20) hole located at opposite ends thereof which is aligned with the cylinder (14') during the pressing of the cylinder (14') onto the inner casing (12). The spiral-welded cylinder (14') is then pressurized through the inlet (18) with the outlet (20) being blocked to thereby expand the cylinder (14') between the spiral welds (28) into a series of semicircular passageways (16) for allowing cooling fluid flow.