In order to improve the service life of ferrite steel and austenitic steel welded joints of boiler superheater tubes in thermal power plants, a combination of ferritic steel and nickel-based welded austenitic steel element joints was proposed and developed. Contrast analysis of joint thermal simulation, the element combination joint has obvious effects on improving joint stress distribution, inhibiting carbon diffusion and improving endurance strength.
Welding inspection and equipment 20002323 Probabilistic safety assessment of defective welding pressure vessels and pipelines is based on the second-order moment theory, and a partial coefficient method for probabilistic safety assessment of defective welding pressure vessels and pipelines is established. The method is simple and practical, and the calculation accuracy is relatively high. For the pressure vessel and pipeline 20002324 of the welding project, considering the aging and corrosion of the welded structure, and its life-span. For the large-scale welded geological engineering, the load-bearing structure with high ecological risk is studied in detail. The prediction of life expectancy is carried out by the theory of monitoring technology diagnosis and evaluation. 4 2 parameters 8 20002325 Spherical tank girth weld and ray detection process design Liu Min discussed the conventional, ray inspection equipment used to check the limitations of special angle girth welded spherical tank, and designed an efficient inspection process plan.
It is pointed out that not all circular welds use a circumferential ray machine. It is simply considered that the ray beam can cover the entire weld to use the circumferential exposure technology for secondary detection. To ensure the detection rate of longitudinal planar defects, it is necessary to Consider the position of the weld and the direction of its normal, and control the angle between the radiation direction and the normal of the weld. In fact, when inspecting a weld with a large thickness, when the included angle is large, the width of the weld image will increase to the width of the negative film. 5 reference 3 20002326 welding inspection method database system Wang Shaogang nondestructive testing. 1999, 218.373375 Welding inspection method database system 083 was developed under +, so it can be run in a variety of operating systems and machine environments. It is worth noting that for a certain type of welded joint, multiple inspection methods can sometimes be used. At this time, the system will follow the optimization principle in the process of inference. The best inspection method will be shown first, and other suitable inspection methods will also be shown , Which fundamentally solves the problem of system integrity. 3 Reference 6 20002327, Concealed Defects and Detection of Explosively Welded Stainless Steel Clad Plates This article mainly introduces the morphological distribution and ultrasonic detection of two concealed defects in explosion welded stainless steel clad plates.陉 1 å‚ 4 20002328 Ultrasonic attenuation in valve steel parts of power equipment. It is pointed out that the following steels have different shear wave attenuation coefficients of pearlite and different grades of steel of the same grade; In 2001, 60 steel electroslags were remelted, and the audio frequency used was 4.0. The attenuation coefficient of longitudinal waves of 15, 1 and 20 steel was equal to the audio frequency 2.51 used in 2030. If the audio 4.0 is used, even if it is the same test piece, it will vary within a relatively large range of 32, 68 dBm. 08, 18 out 01 Austenitic steel longitudinal wave attenuation coefficient has a big difference, if the audio frequency is 1.82, it will change within the range of ll31dBm in different frequency bands of the same limited use standard. 08X18H10T shaped steel, diameter 7075, far away from the reflector 3040 during ultrasonic flaw detection, audio frequency is 2.52, and its limited use standard is interchangeable. Based on the results of this work, Heng compiled the interchangeability evaluation method for the limited use standard used in ultrasonic flaw detection. 32 Ref. 7 20002329 Acoustic emission source for on-site pressure vessel inspection Shen Gongtian 20002330 Defect coordinate measurement of acoustic emission signals in welded joints Defect coordinate measurement method and instrument for welded joints through acoustic emission signals were designed. It is produced during the automatic argon arc welding of the melting pole. It is pointed out that in the process of monitoring the welding of cylindrical parts, gas welding and cutting, the national company exhibited gas welding gas cutting equipment at the Essen exhibition.
Advertised nozzles for propane or acetylene. Also exhibited are 896 two-stage pressure reducing valves, which can use different gases from hydrogen to helium and cylinders with different pressures.
20002334 The gas cutting technology and application of new cutting gas You Jian Aimed at the energy consumption cost of flame cutting by using acetylene as gas, the two new types of gas and acetylene were compared through experiments, and the cutting process was explored. , Demonstrate the economics and feasibility of using a new type of gas to completely replace acetylene, and make it successfully applied in production. 4 reference 2 20002335 circles, 10 microcomputer controlled gas cutting machine several cases to troubleshoot 20002336 manual gas cutting master Luo Chunxin welding machine. 1999, 29.26, 28 pointed out that the use of manual gas cutting master can greatly improve the difficult conditions of squat cutting, and improve the efficiency and quality of gas cutting. It is introduced that the determination of the coordinates of the manual gas joint defects is very accurate and reliable. It can provide information on the welding quality monitoring process of the analyzer. 52 20002331 Thin-walled aluminum alloy small-diameter tube eddy current detection Liu Langfei, 20002332 Industrial structure of macroscopic crack growth of radioisotopes to macroscopic crack growth on large components, it is best to use the radioisotope method to detect, this method can be carried out during the use of components Check to identify the danger points of the accident. The radioisotope multiple inspections conducted at the thermal power plant revealed that macroscopic crack propagation mostly occurred at the weld.
After the pipeline has been used for 4 months, the degree of macroscopic crack propagation is 30 35. The macroscopic crack propagation at the bend of the pipeline is not large 20 25. The industrial inspection of thermal power plants can identify the most dangerous accident points and can be ruled out later. Refer to 2 Process and Equipment Advantages of Cutting Masters. 1 Masters are simple to make, easy to take materials, and low in cost; 2 Cut quality and flat cutting surface; 3 High cutting efficiency, convenient and flexible, save working hours, easy to remove slag; 4 Narrow slit precision Save gas cutting materials and welding materials; 5 improve the working conditions of gas cutting workers, which is good for health; 6 use manual Qi Qi cutting without superb skills.
20002337 Precision cutting of the mouth flange of the tooth-type quick-opening pressure vessel Aiming at the problem of manufacturing the tooth profile of the large-scale tooth-type flange, a method of substituting precision CNC cutting for machine tool processing is proposed, and the basic of the corresponding deformation cutting process is formulated. in principle. This method has been successfully applied in actual production. The application of 32 ginseng 2 20002338 automatic carbon arc gouging machine on the railway light oil tank trucks. The quality of the carbon arc gouging root cleaning process cannot be guaranteed for the key links that affect the welding quality and the appearance of the weld seam in the production of 660 tank cars. An automatic carbon arc gouging machine. Using automatic carbon arc gouging instead of manual gouging, combined with technological improvement, successfully solved this difficulty
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