Ultrasonic inspection method of back end of thick-wall aluminum alloy pipe

Abstract

An ultrasonic inspection method of a back end of a thick-wall aluminum alloy pipe relates to a method for inspecting the back end of the thick-wall aluminum alloy pipe and solves a problem that the inspection is not complete when a presently-adopted metallographical random inspection method is used for inspecting back end residual of a thick-wall aluminum alloy pipe workpiece. The ultrasonic inspection method is as follows: selecting an ultrasonic detector and a longitudinal wave normal probe and a transversal wave angle probe which are assorted with the ultrasonic detector; grinding an interface between the transversal wave angle probe and a workpiece into a cambered surface with curvature which is the same as the curvature of the pipe workpiece; debugging the ultrasonic detector and the probes in a combined manner; then, by using the two probes, simultaneously carrying out ultrasonic inspection on a tail end of the thick-wall aluminum alloy pipe workpiece to be inspected; moving the probes towards the pipe tail part by starting from a position in which echo wave amplitude of the ultrasonic probes is 80 percent of a full swing, till the amplitude is not greater than 1 percent; and cutting a 20-millimeter section of the pipe workpiece in a direction, which is the reverse of the movement direction of the ultrasonic probes, by taking the position as a boundary. The invention can realize 100-percent inspection of products, avoids phenomena of missed inspection of the back end residual and waste of surplus cut finished products, and ensures the product quality.

Description

technical field [0001] The invention relates to a detection method for shrinkage of an aluminum alloy thick-walled tube. Background technique [0002] Aluminum alloy thick-walled tubes are important materials used in aviation and aerospace fields. If there is tailing residue in the tube wall, inclusions and crack defects will occur during die forging and machining, resulting in product scrap. At present, metallographic (low magnification) method is still used for proportional sampling inspection of the shrinkage of aluminum alloy thick-walled pipes, which makes the pipes that have not been extracted may still have shrinkage residues, which poses a major hidden danger to product production. It is detected by scientific ultrasonic method, which can effectively guarantee the quality of military products. Contents of the invention [0003] The invention solves the problem of incomplete detection existing in the conventional metallographic sampling inspection method for detect...

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