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Butt joint

About: Butt joint is a research topic. Over the lifetime, 6840 publications have been published within this topic receiving 36822 citations.


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Patent
28 Apr 2020
TL;DR: In this article, a bottom plate feeding assembly is arranged at one end of the positioning jig, and a wheel material guiding assembly is placed at the other end of this jig.
Abstract: The invention relates to the technical field of universal wheel machining, in particular to automatic assembling equipment for a universal wheel bottom plate. The automatic assembling equipment comprises a machining table. A positioning jig used for temporarily storing workpieces is arranged above the machining table. A bolt tool assembly and a nut tool assembly are arranged on the two sides of the positioning jig correspondingly. A two-way moving assembly is arranged below the machining table. A wheel material guiding assembly is arranged at one end of the positioning jig. One end of the wheel material guiding assembly is in butt joint with one end of the positioning jig. A bottom plate feeding assembly is arranged at the other end of the positioning jig. One end of the bottom plate feeding assembly is in butt joint with one end of the positioning jig. A discharging rail is further arranged above the machining table. A discharging assembly is arranged above the positioning jig and fixedly connected with the table top of the machining table through a fixing support. The discharging assembly comprises a pneumatic clamping jaw capable of moving between the positioning jig and the discharging rail. The equipment can automatically conduct tool assembling on wheels and the bottom plate of universal wheels, and the machining efficiency is improved.
Patent
26 May 2020
TL;DR: In this article, a manufacturing method of an internal crack defect testing plate for non-destructive testing teaching is presented, in which the welded joint cold crack generation mechanism in the welding process is utilized, the high-constraint testing plate butt joint mode is adopted, a high-carbon-equivalent welding material is used, normal-temperature welding is conducted and supplemented by application of the forced rapid cooling measure after welding is accomplished, a product is placed for 24 hours, and therefore a welded joints internal crack which meets the requirements for the designed crack position,
Abstract: The invention discloses a manufacturing method of an internal crack defect testing plate for non-destructive testing teaching. The manufacturing method comprises the steps that the welded joint cold crack generation mechanism in the welding process is utilized, the high-constraint testing plate butt joint mode is adopted, a high-carbon-equivalent welding material is utilized, normal-temperature welding is conducted and supplemented by application of the forced rapid cooling measure after welding is accomplished, a product is placed for 24 hours, and therefore a welded joint internal crack which meets the requirements for the designed crack position, the depth and the length can be formed; and then a clamp and a testing plate point fixation are disassembled, bottoming welding is conducted in the region without the designed crack, a defect testing plate is filled and subjected to face covering welding, finally the welded joint surface cleaning is conducted, and the manufacture of the testing plate is accomplished. The welded joint internal crack formed according to the manufacturing method is different from the artificial defect in a common non-destructive testing standard testing plate, the crack defect is real, and the method is feasible, can be used for conducting non-destructive testing such as ultrasonic non-destructive testing, and training and examining non-destructive testing personnel, and has the important significance in enhancing the understanding of the non-destructive testing personnel for crack defect detection signals. The manufacturing method of the internalcrack defect testing plate for non-destructive testing teaching has the advantages of being flexible and accurate in locating, meeting the requirement of actual teaching and training and being broad in application range.
Patent
30 Oct 1989
TL;DR: In this article, the authors proposed to enhance control stability by providing a first amplifier for directly detecting an output voltage, and a fundamental wave component detection circuit for producing only the fundamental wave signal from it.
Abstract: PURPOSE:To enhance control stability by providing a first amplifier for directly detecting an output voltage, and a fundamental wave component detection circuit for producing only a fundamental wave signal from it. CONSTITUTION:An inverter controlling circuit is composed of a first amplifier 1 having proportional amplifiers 1a-1c, a fundamental wave component detection circuit 2 having a butt joint 3, a second amplifier 4, a butt joint 5, and a third amplifier 6, a butt joint 8 having comparator 8a-8c, a P-I amplifier 9, a carrier generation circuit 10, a butt joint 11, a comparator 12, an inversion circuit 13 and an insulated transmitter 11. Thus, the output signal of the detection circuit 4 is input to the amplifier 9, a voltage command signal is compared to be amplified with a fundamental wave signal, and input to the comparator 12. Further, it is compared to be controlled by the comparator 12 to drive a transistor inverter.
Patent
29 Feb 2012
TL;DR: In this article, the authors proposed a butt joint device for an optical fiber cold connector, which is characterized by comprising three positioning pins A, B and C which are tightly pressed against one another by external force to form an optical fibre through hole, wherein the size of the optical fiber through hole is determined by determining the sizing of the positioning pins, and the offset of the butt joint end face of two penetrated optical fibers is controlled to complete the optical fibers.
Abstract: The invention relates to a butt joint device for an optical fiber cold connector. The butt joint device is characterized by comprising three positioning pins A, B and C which are tightly pressed against one another by external force to form an optical fiber through hole, wherein the size of the optical fiber through hole is determined by determining the size of the positioning pins, and the offset of a butt joint end face of two penetrated optical fibers is controlled to complete the butt joint of the optical fibers. The invention has the advantages that: the optical fiber cold connector of the butt joint device breaks through the conventional structure and has the characteristics of simple structure, reliable performance, long service life, capability of being used repeatedly, low cost and the like.
Journal ArticleDOI
TL;DR: In this paper, the results of the measurements were used in averaging the resultant mechanical characteristics in each line along the length of the specimen (across the welded joint) with a total of 100 measurements were taken on each specimen.
Abstract: It is well-known that in welding, the anisotropy of the mechanical properties of welded joints causes a stress concentration under loading. Therefore, regardless of the calculations of welded structures (for example, transmission pipelines) on the basis of the operating conditions in the elastic range, in individual cases the area of the welded joint may contain stresses exceeding the yield limit and causing embrittlement of the individual areas followed by fracture. In the construction of transmission pipelines for the transport of oil and gas, it is necessary to carry out continuous radiographic inspection of welded joints, including examination of the presence of microcracks in the welded joint. This is followed by expensive hydraulic tests of the assembled sections of the pipeline with the pressure generating stresses equalling 95% of the standard yield limit of the material of the pipe (the actual value of the yield limit is not available). According to the results of long-term investigations, these tests do not prevent failure of pipelines in the initial service period. At present, in order to ensure the guaranteed the strength of the pipelines, it is proposed to carry out hydraulic tests with increased pressure, exceeding the yield limit of the pipe. For example, in Germany, in the testing of pipelines, the pressure is 10% higher than the yield limit. These tests are referred to as the ‘the stress test’. Thus, in order to prevent the embrittlement of the individual areas of the welded structures subjected to the effect of stresses exceeding the yield limit of the parent metal and in physical tests of the strength of the parent metal, it is important to know the changes of the mechanical characteristics of the material of the butt welded joint under elastoplastic deformation. This problem can be solved by the application of the ‘Strength’ electronic-computer system for the determination of mechanical characteristics in a local area. For experimental investigations of the mechanical characteristics of butt welded joints in a transmission gas pipeline 10 specimens with a size of 95 × 20 × 9 mm were taken from a welded shell (steel 09G2S) in the directional on the generating line of the pipe. Manual arc welding was carried out in accordance with Technical Instructions for the constructional-assembling operations at the Yuzhtruboprovodstroi Company. The mechanical characteristics of individual regions of the specimens after preliminary grinding were measured using the ‘Strength’ electronic-computer system: on some specimens, measurements were taken in the direction across the welded joint (along the specimen) in 1.5–2 mm steps in the direction of parallel lines with the lines spaced at 1–2 mm, and along the joint parallel to each other, with a spacing of 5 mm (Fig. 1 a). On other specimens, the mechanical characteristics were measured in the direction parallel to the welded joint (across the specimen) in 2–3 mm intervals at five points with a step of 1.5–2 mm (Fig. 1 b). The results of the measurements were used in averaging the resultant mechanical characteristics in each line along the length of the specimen (across the welded joint). A total of 100 measurements were taken on each specimen. The resultant average values of the individual mechanical characteristics along the length of the specimens were approximated by a polynomial of the sixth degree. All the curves of the investigated specimens for the individual mechanical characteristics are close to Welding International 2004 18 (3) 213–215 Selected from Svarochnoe Proizvodstvo 2003 47 (10) 3–5; Reference SP/03/10/3; Translation 3268

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202375
2022175
2021200
2020606
2019699
2018587