about 3 7 boron about 39 7 nickel and about 36 iron was prepared using standard atomization techniques an oxygen acetylene puddle spray torch grade powder was prepared from the above mentioned atomized powder a worn metal shear blade edge was rebuilt using a conventional oxygen acetylene puddle spray torch with standard practices and techniques satisfactory oxygen acetylene puddle spray torch welding characteristics such as good wetting properties and flowability coupled with sufficient puddle stiffness for retention of bead configuration were observed a satisfactory well bonded crack and porosity free overlay was observed following subsequent machining operations using conventional grinding techniques the restored metal shear blade was returned to service and was observed to perform equal to a blade restored with an overlay of a comparable cobalt base alloy a fine powder alloy consisting by weight of about 1 chromium about 1 1 carbon about 0 15 silicon about 0 35 manganese about 3 boron about 30 nickel and about 64 4 iron was prepared using standard atomization techniques an oxygen acetylene metal powder spray torch grade powder was prepared from the atomized powder a worn feedscrew coupler rod was prepared for powder metal spray using standard practices commonly accepted by the industry a coating of the above mentioned powder alloy was sprayed onto the prepared coupler rod using.