24 may be ground at the connector end 18 to the required diameter although a direct pass through inner conductor 24 advantageously eliminates interconnections for example with the spring basket of a traditional coaxial connector inner contact such may introduce electrical performance degradation such as pim where the inner conductor 24 is also aluminum material some applications may require a non aluminum material connection point at the inner contact inner conductor of the connection interface 14 as shown for example in fig1 a center cap 50 for example formed from a metal such as brass or other desired metal may be applied to the end of the inner conductor 24 also by laser or friction welding to apply the center cap 50 the end of the inner conductor 24 is ground to provide a pin corresponding to the selected socket geometry of the center cap 50 to allow material inter flow during welding attachment the socket geometry of the center cap 50 and or the end of the inner conductor 24 may be formed to provide annular material gaps 22 laser welding apparatus may be provided with a fiber optic laser head extension which may be adjusted to aim the laser beam b at each target location along the seam 16 alternatively the coaxial connector 2 upon which the target location resides may be maneuvered to align the target location with respect to the laser head 54 a laser head 54 typically includes a collimator 56 and a focus lens 58 which focuses the laser beam b upon a focal point f at the target location as shown in fig1 the.