A method 1, and wherein the fixing member comprises at least two round disks whose axial lengths are considerably less than their diameter, and positioning said disks a distance apart from each other, between the plates, and separately welding {TAIL ~ each} of the disks, at their lines of {HEAD ~ contact}, to each of the plates 
A method 1 , and wherein the fixing member comprises at least two round disks whose axial lengths are considerably less than their diameter , and positioning said disks a distance apart from each other , between the plates , and separately welding { TAIL ~ each } of the disks , at their lines of { HEAD ~ contact } , to each of the plates
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