Testing device for corrosion fatigue properties of welding joint

Abstract

The invention discloses a testing device for corrosion fatigue properties of a welding joint. A tested piece penetrates through an airtight transparent test box; two ends of the tested piece are arranged on a tension-compression fatigue tester; an acoustic emission probe is arranged on the surface of the tested piece; a surface morphology recording device for recording surface morphology of the tested piece is arranged at the corresponding position of the test box and is connected with a control device; the testing device is also provided with a corrosive liquid constant temperature circulating device; a water storage tank is connected with one end of a water inlet pipe through a first water pump arranged below the liquid level of the water storage tank; the other end of the water inlet pipe is communicated with the upper part of the test box; the lower part of the test box is communicated with the water storage tank by a water outlet pipe; the control device is also connected with a pH tester arranged below the liquid level in the water storage tank. According to the testing device disclosed by the invention, the corrosion fatigue properties of the welding joint under actual working conditions of double action of a field corrosion environment and alternating stress can be simulated.

Description

technical field [0001] The invention belongs to the field of material corrosion fatigue testing devices, in particular to a testing device for corrosion fatigue performance of welded joints. Background technique [0002] Due to its light weight, short construction period, easy disassembly and recyclable materials, steel structures are widely used in bridge construction, and the commonly used connection method is welding; bridge welded joints are subject to complex forces, and the service environment has different degrees of corrosion , with the construction of various sea-crossing bridges, the service environment of bridges has become more severe, and the corrosion fatigue problem of welded joints needs to be solved urgently; at present, domestic research on corrosion fatigue mostly stays on the material itself, and there are few studies on corrosion fatigue of welded joints. The methods and test devices are limited; especially the research on crack initiation and crack grow...

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Problems solved by technology

[0002] Due to its light weight, short construction period, easy disassembly and recyclable materials, steel structures are widely used in bridge construction, and the commonly used connection method is welding; bridge welded joints are subject to complex forces, and the service environment has different degrees of corrosion , with the construction of various sea-crossing bridges, the service environment of bridges has become more severe, and the corrosion fatigue problem of welded joints needs to be solved urgently; at present, domestic research on corrosion fatigue mostly stays on the material itself, and there are few studies on corrosion fatigue of welded joints. Limited methods and test setups; especially lack of test setups for studies on crack initiation and crack growth rates in welded joints

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