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DEVELOPMENT OF FLUX COVERED ELECTRODES FOR WELDING 18% NI-CO-MO MARAGING STEEL.
MILITARY ENGINEERING EXPERIMENTAL ESTABLISHMENT CHRISTCHURCH (ENGLAND)
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The development and testing of a flux covered electrode suitable for welding 18 Ni-Co-Mo maraging steel is described. A special flux has been developed to ensure low silicon pick-up in the weld bead, due to the reduction of silicates in the flux by titanium, and adequate titanium recovery. Tensile and impact tests have been carried out on butt welds produced in 316 in. thick sheet and on all-weld-metal test pieces produced by butt welding 34 in. thick material. Ageing for 3 h at 480C. produced tensile strengths of 96.65 tonf per sq. in. with impact values of about 10 ft-lb. From side fillet welds shear strengths approximately 0.4 of the tensile strength were obtained. Extensive radiography shows that sound welds can be produced over the range of thicknesses investigated. Adjustments in the core wire composition to obtain an electrode more suitable for use with the 90 tonf per sq. in. grade of maraging steel are suggested. Author
APPROVED FOR PUBLIC RELEASE