YIELD STRENGTH FILLER METALS AND WELDING PROCEDURES.
UNITED STATES STEEL CORP MONROEVILLE PA
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This report reviews the status of 1 the MIG and covered-electrode filler-metal development, and 2 the joining techniques development to date. In the study of the effects of major alloying elements on the properties of MIG weld metals, serious cracking problems were encountered. In the first group of welding wires the problems were traced to carbon levels which were greater than those anticipated from ingot analyses. Experimental covered electrodes of fifteen compositions have been made and six weld metals have been deposited in joints. In addition, a covered-electrode coating study is underway. Work in joining techniques has been directed toward a study of the parameters of the dip-transfer process. The pertinent electrical characteristics of the power supply used in this program have been measured. A number of gases have been screened as to their applicability for use with this process. Author