Abstract

Abstract : A program was conducted to evaluate the effects of a proprietary backup flux-welding technique on the impact fracture toughness properties of Ti-5A1-2.5 Sn alloy plate. The flux was the product of Mitron Research and Development Corporation Precracked Charpy (often called subsize Charpy) specimens were tested under impact loads at -320 degrees F, -100 degrees room temperature, and 550 degrees F. The weld and heat affected zone (HAZ) bad greater fracture toughness resistance than the base metal. The fracture resistance, work per unit area (W/A) decreased with decreasing test temperature. At -320 degrees F the weld and HAZ retained 1/3 of their fracture resistance at room temperature. However, the weld- and HAZ-converted W/A impact fracture resistance at -320 degrees F had a Kc approximately equal 125 ksi square root of in. which indicated good toughness for this temperature. The fracture resistance did not appear to be a function of the specimen's location through the thickness of the plate for a given specimen orientation. In general, the fracture resistance of the weld and HAZ compared to the base metal was excellent,

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