Adjustable welding restraint stress testing device

Abstract

The invention discloses an adjustable welding restraint stress testing device. The adjustable welding restraint stress testing device comprises a force application unit, a fixture unit and a body unit, the fixture unit is arranged between two transverse rods on the body unit, the force application unit is corresponding to a weld element on the body unit, and pressure is applied to the weld element through an adjustable screw rod; the fixture unit comprises an upper press plate, a bolt and a lower press plate, and the weld element passes through the upper press plate and lower press plate to fix on the body unit in a compression mode through the bolt. The adjustable welding restraint stress testing device is capable of quickly and conveniently measuring the critical restraint degree and critical restraint stress of the cold crack of a weld assembly so as to provide a scientific basis for formulating reasonable welding parameters and technology conditions; the adjustable welding restraint stress testing device is convenient to use, scientific and reasonable in structure, simple in production technique, low in manufacturing cost and easy to popularize; the adjustable welding restraint stress testing device can be broadly used for the welding restraint degree evaluation test for different kinds of steels.

Description

technical field [0001] The invention relates to an adjustable test device for welding restraint stress. Background technique [0002] Welding solidification crack is one of the most harmful defects in welded components. It is the cause of cold cracks, reheat cracks, fatigue cracks, etc., and its existence may directly lead to the fracture of the welded structure during operation. The structural thermodynamics of the welding cooling process The characteristics are the key factors for the generation and propagation of welding solidification thermal cracks, and the variation law of thermal parameters presented by the welding cooling process structure can directly characterize the generation and expansion state of solidification thermal cracks; Acquisition is an important means to analyze the physical nature of the formation and expansion of solidification hot cracks and predict welding solidification hot cracks, and then provide important basic data and basis for the suppressio...

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Problems solved by technology

[0003] The key to on-line detection of welding solidification hot cracks is to find and select physical information that can fully characterize the formation and propagation of solidification hot cracks during the welding process. Length, number of strips and other parameters can also quantitatively measure the critical variable and brittleness interval of material cracks, and draw the solidification and plastic curve. At the same time, we can also grasp the dynamic process of welding solidification cracks through signals; It is an important mechanical parameter to study welding cracks. As special high-strength steels are used in more and more structures, cold cracks caused by excessive welding constraints It is getting more and more serious, and the traditional welding restraint evaluation requires complex equipment structure, cumbersome test methods, and harsh test conditions

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