A nondestructive method for detecting a fusion degree of a stud weld seam and a special-purpose probe therefor

Abstract

The invention relates to a nondestructive method for detecting a fusion degree of a stud weld seam and a special-purpose probe therefor, and belongs to the technical field of detection equipment. According to a technical scheme, when the stud weld seam has a poor-fusion defect which directly causes a change of the size of the weld seam bonding area, and the change is further reflected in a change of a measurement value on a screen of a direct-current resistance tester (11); and the direct-current resistance tester displays a difference between a practical measurement value and a standard value, thus completing nondestructive detection of the fusion degree of the stud weld seam. A positive and negative pole contact integrated structure is adopted by the special-purpose probe, and therefore a contact area is large during detection, stress is even, a structure is simple, operation is flexible, a detection efficiency is high and an error is little. The fusion degree of the stud weld seam is measured through a direct current resistance process, damages to a stud and weld seam strength are avoided, operation is convenient, a detection efficiency is high, and the method and the probe are suitable for large-scale rapid detection on a production line and on site.

Description

technical field [0001] The invention relates to a non-damaging method and a special probe for detecting the fusion degree of a stud weld, belonging to the technical field of detection equipment. Background technique [0002] Stud welding is widely used in many fields such as automobile manufacturing, mechanical equipment manufacturing, and steel structure engineering. Due to the influence of various factors such as welding equipment, welding parameter selection, and welding operations, the weld between the stud and the workpiece is often The defect of poor fusion occurs, and this local lack of fusion will greatly reduce the strength of the stud weld, which in turn will cause the stud to break and fall under force. At present, destructive tests such as torque test and bending test are often used to detect the fusion of stud welds. Even if the studs pass the destructive test, their mechanical properties will be damaged to a certain extent. However, the commonly used methods o...

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Problems solved by technology

[0002] Stud welding is widely used in many fields such as automobile manufacturing, mechanical equipment manufacturing, and steel structure engineering. Due to the influence of various factors such as welding equipment, welding parameter selection, and welding operations, the weld between the stud and the workpiece is often There are defects of poor fusion, which will greatly reduce the strength of the stud weld, and then cause the stud to break and fall due to force

At present, destructive tests such as torque test and bending test are often used to detect the fusion of stud welds. Even if the studs pass the destructive test, their mechanical properties will be damaged to a certain extent.

However, the commonly used radiographic testing and ultrasonic testing methods are not suitable for the detection of the fusion degree of a large number of stud welds on the construction site due to the limitations of various parameters.

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