A test device and evaluation method for obtaining weld thermal cracks

Abstract

The invention discloses a test device and evaluation method for obtaining weld thermal cracks, which belong to the field of welding technology, wherein the test device for obtaining weld thermal cracks includes a first steel plate and a second steel plate with a gap, the second steel plate is in the The first side in the thickness direction is welded to the first steel plate. The evaluation method includes steps S1, preparing the above-mentioned test device for obtaining weld hot cracks; S2, using a flux-cored welding wire to vertically weld the second steel plate on the second side in its thickness direction to form a test weld with the first steel plate. S3, select a sampling section on the test weld, and measure the length H of the sampling section; S4, perform flaw detection on the sampling section, and obtain the sum L of the lengths of all hot cracks along the extension direction of the test weld; S5, according to L and H to obtain the hot crack incidence rate of the flux-cored wire. The test device for obtaining weld thermal cracks has a simple structure, and its evaluation method is easy to operate. The use of downward vertical welding improves the occurrence rate of thermal cracks and test efficiency.

Description

technical field [0001] The invention relates to the technical field of welding, and in particular, to a test device and an evaluation method for obtaining hot cracks in a weld. Background technique [0002] Flux-cored wire has less spatter during welding, and the weld is well formed. Moreover, its formula composition can be adjusted according to different steels to be welded, so as to improve the actual welding quality. [0003] In welding construction, hot cracks are prone to occur in the weld formed by the flux-cored wire, which directly affects the quality of the weld and the stability of the connection between the weldments. Generally, the length of each hot crack on the same weld along the extension direction of the weld is measured and the total length is calculated. The ratio of the total length of the hot crack to the length of the weld is the hot crack occurrence rate, which is the evaluation One of the standards for the quality of cored wire. [0004] Due to the...

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Problems solved by technology

Among them, the T-joint welding crack test method and the pressure plate butt welding crack test method are more suitable for the evaluation of the hot crack test of the welding rod, and because the hot crack occurrence rate is low, it is not suitable for evaluating the hot crack occurrence rate of the flux cored wire.

Although the adjustable restraint crack test method can simulate thermal cracks, the test device is relatively complicated and there are many variables in the test process, so it is not suitable for popularization and application.

The improved Badong test method is an effective way to simulate the bottoming crack of flux-cored welding wire, but the test device of this method is relatively complicated, and more materials are consumed, and the difference in the restraint degree of the weld seam has a great influence on the test data , and in most cases the occurrence rate of thermal cracks is small, it is not suitable for statistical measurement

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