Fixture and method for measuring maximum tensile and shearing force of lap joint of friction stir welding

Abstract

The invention provides a fixture and a method for measuring the maximum tensile and shearing force of a lap joint of friction stir welding to overcome the problem that additional bending moment influences measurement results of the maximum tensile and shearing force of a lap joint of friction stir welding in a traditional tensile and shearing test. According to the fixture, four bearing installing holes are arranged along a same horizontal line; eight rollers are arranged in two layers, each layer consisting of four parallely arranged rollers; the end parts of each roller is mounted in a corresponding bearing installing hole through a positioning bearing. The method comprises the following steps: 1, allowing the distance between axle centers of two rollers located at two outermost sides of each layer of rollers to be 10 to 20 times thickness of the lap part of a test piece for tensile and shearing testing; 2, placing the test piece for tensile and shearing testing between the upper layer of rollers and the lower layer of rollers; and 3, clamping the assembled test piece for tensile and shearing testing, the fixture and cushion blocks on a tensile and shearing testing machine, carrying out tensile and shearing testing on the test piece for tensile and shearing testing at a loading speed of 0.5 to 1.5 mm / min and recording a maximum tensile and shearing test load F. The fixture and the method provided by the invention are used for measuring the maximum tensile and shearing force of the lap joint of friction stir welding.

Description

technical field

[0001] The invention relates to a fixture and a measuring method for measuring the tensile shear force of a friction stir welding lap joint, in particular to a fixture and a measuring method for measuring the maximum tensile shear force of a friction stir welding lap joint. Background technique

[0002] Friction stir lap welding is a relatively new solid-phase joining technology. Compared with traditional riveting technology, it can significantly reduce structural weight and improve joint quality. In addition, it has the advantages of low production cost and no environmental pollution. The most important performance index for evaluating friction stir lap joints is the maximum tensile shear force; in the process of tensile shear test of traditional friction stir welded lap joints, due to the asymmetry of lap joints, it is impossible to make the load in tension The load on both sides of the shear measurement specimen is on the same straight line, thereby genera...

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