Welding of High Strength Structural Steel: Properties of Butt Welds made with Commercial Ferritic and Austenitic Electrodes in 1/2 inch Thick Quenched and Tempered Alloy Steel Plate

摘要

The objective of this research is to compare strength and toughness of butt welds made with nine ferritic and one austenitic electrodes in 1/2 inch thick alloy steel heat treated to 150,000 psi. yield strength. Restrained butt weld tests were made to investigate susceptibility to cracking during welding. Tensile properties as determined by transverse tensile specimens taken from butt weld joints in the as-welded and stress relieved conditions are given. Repeated impact fracture tests of transverse butt weld specimens demonstrate the poor toughness of ferritic welds with underbead cracks and of austenitic welds which tend to fail in the fusion zone particularly after stress relieving. Charpy V-Notch impact tests at +70 and -40 F evaluate the relative toughness of the weld metals.