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Research on surface defect detection algorithm of pipeline weld …
Improved YOLOv7 network. The pipeline weld surface defect detection model in this paper is shown in Fig. 1. The main structure of YOLOv7 model is circled by the red rectangle, and the numbers near ...
Simulation on the weld crack growth in the surface of oil/gas pipes by using a magnetic-structural coupling algorithm …
Oil/gas pipes in petroleum industry are working in a complex environment. weld crack in the surface of pipes is one of the major causes for pipe failure. Quick crack growth under the pressure of the liquid in pipe has been reported as the root cause for many catastrophic accidents. It is therefore important to study key scientific issues associated …
Nondestructivie Weld Examination
Otherwise, destructive tests are the only sure way to determine weld serviceability. Radiographic Inspection. Radiography (X-ray) is one of the most important, versatile and widely accepted of all the nondestructive examination methods - Fig. 1. X-ray is used to determine internal soundness of the welds.
Progress and perspectives of joints defects of laser-arc hybrid welding…
The LAHW is a novel welding technology[], which was first proposed and experimentally studied by Professor Steen in 1978 [].The characteristics of different welding methods are summarized in Table 1.As shown in Fig. 3, the LAHW technology integrates the advantages of laser and arc heat sources, which can significantly enhance the quality of weld …
Leakage failure analysis of a 60 m3 LNG storage tank
The failed mechanism of a leaky 60 m 3 LNG storage tank made of 304 stainless steel was researched. •. The black strip-shaped phases in the matrix of the lower head were clarified by TEM as δ-ferrite. •. The corrosion resistance of the material was decreased by the δ-ferrite and martensite in the matrix. •.
Welding of Dissimilar Metals—Challenges and a Way Forward with Friction Stir Welding …
Abstract. The joining of dissimilar materials is proving beneficial for several industrial applications to achieve desired properties and improve the production economy. However, producing a satisfactory joint in between dissimilar metals is always being a challenge due to their distinct physical and chemical properties.
Laser welding of current collector foil stacks in battery …
Stacks of 40 metal foils were welded with a thin metal sheet in lap joint configuration. Based on an analysis of the requirements for minimum mechanical seam …
Research on the influence of parallel seam welding parameters …
As a highly reliable hermetic sealing method, parallel seam welding sealing has an increasingly important application in the ceramic packaging industry. For thin-walled ceramic package, the structural strength itself is relatively weak, and the high energy instantaneously generated during the seam welding process will cause thermal shock to the ceramic …
Development of a flywheel energy storage-based welding system
In modern resistance spot welding applications dynamic current control is essential, but at the same time, the current drawn from the mains should be as low and consistent as possible, making an energy storage mandatory. As the type of storage is extremely important for the total system performance, it must be selected carefully focusing primarily …
Ultrasonic system and ultrasonic metal welding performance: A …
Ultrasonic metal welding (USMW) technology receives widespread attention because of its advantages of environmental protection, high efficiency, high welding strength, and low joint resistance. This paper systematically discusses the research progress of the ultrasonic generator, transducer, booster and horn.
Continuous ultrasonic welding of thermoplastic composites: Enhancing the weld uniformity by changing the energy …
Another promising welding technique is ultrasonic welding, which is a fast and efficient welding technique that does not require foreign material at the interface. 5–13 During the welding process, a sonotrode (metal horn) applies high-frequency (i.e. 20 kHz), low-amplitude (i.e. 50 to 100 µm peak-to-peak) vibrations to the weld interface, …
Weld defect identification and characterization in radiographic …
This investigation is required for recognizing and localizing several types of weld defects, such as porosity, surface cracks, inclusion, undercut, poor fusion, and poor penetration []. The weld defects can significantly impact the welded joints'' reliability, durability, and mechanical properties such as stiffness, toughness and strength [ 3 ].
Water leakage due to the welding defect and improvement to …
The occurrence of leakage is most likely dependent on the soundness of welding. We twice experienced water leakage at the MLF. We first observed that water …
Role of welding residual stress in stainless steel piping with …
The predicted leakage rate of piping circumferential through-wall cracks (CTWC) under various loading levels is a critical factor for the application of leak-before …
Resistance welding of carbon fibre reinforced thermoplastic composite using alternative heating …
The use of an insulation layer on the surface of the heating element or laminate has proved to be an effective method to prevent current leakage and can be used to join large welding area specimens. The Mode I interlaminar fracture toughnesses of welded specimens were equivalent to that of the co-moulded benchmark (GF-PEI), and …
Real-time monitoring of weld surface morphology with lightweight …
1. Introduction Laser welding has the advantages of large weld depth-to-width ratio, high energy density, fast welding speed, and easy-to-achieve automation [1], [2], [3], and is an important means of high-quality manufacturing of stainless steel components in rail transportation, offshore equipment, aerospace, and other fields [4], [5], [6].
Welding techniques for battery cells and resulting electrical …
Hence, resistance spot welding, ultrasonic welding and laser beam welding are mostly applied. Using the example of two battery cells connected in parallel, Fig. 1 illustrates the influence of the quality of cell connections on a battery assembly. The higher electrical contact resistance RC,1 generates more heat at the terminal of cell 1.
Quality control and assurance in fabrication of welded structures subjected to fatigue loading | Welding …
The current paper presents a comprehensive overview of weld quality control and assurance of welded structures where the major failure prevention is due to fatigue loading. It gives the drawbacks and limitation of quality control systems, international weld quality standards, and guidelines used in today''s weld production. Furthermore, in …
Recommended Practices for Stud Welding
1. Process Description. Stud welding is a general term for joining a metal stud or similar part to a workpiece.1 Welding can be done by a number of welding processes including arc, resistance, friction, and percussion. The arc stud welding process (SW), including capacitor discharge methods, will be covered in this document.
Laser Weld Penetration Estimation Using Temperature …
Penetration depth is an important factor critical to the quality of a laser weld. This paper presents a 3D heat conduction model with a moving line source to correlate the temperature measured on the bottom surface of the workpiece to the weld penetration, weld bead width and welding speed. Temperatures on the bottom surface of the …
Electron Beam Welding in Vacuum | AltEnergyMag
On the surface of the workpiece, the electrons release energy precisely at the point of impact, where they heat, melt and vaporize material. The beam generation in the electron beam gun and the actual welding process in the welding chamber take place almost exclusively under vacuum at pressures in the high vacuum range (10-3 to 10-6 …
Structured review of papers on the use of different activating flux and welding …
In A-TIG welding using AF305 flux the weld penetration improved more than 3 times compared to traditional TIG. 8 [12], [30], [31] Mild steel 16 mm/GMA/Activated GMA The air content throughout the flux from the …
Laser welding of plastics for energy storage system
Any leakage across these components would affect the efficiency of the energy storage process, in some cases leading to complete failure. TWI and the utility worked together to …
Revealing internal flow behaviour in arc welding and additive manufacturing of metals
This behaviour was predicted by Kidess et al. 36 and proves a strong evidence of the link between surface energy/temperature derivative, weld pool shape and microstructure. Related to metal ...
Experimental Study on Evolution Law of Self-Magnetic Leakage Field during the Fatigue Process of Steel Weld …
A three-point bending fatigue experiment was conducted on a component consisting of an I-beam and a welded steel plate. The magnetic leakage signal at the position of the weld was continuously collected during the process of fatigue; the factors influencing magnetic leakage signal were analyzed to explore its change law. Moreover, …
NEW LASER WELDING PROCESS FOR EXCELLENT BONDS
Laser welding in overlap (wobbling) promises more affordable Li-ion batteries. Dr. Dmitrij Walter, Dipl.-Ing. Vasil Raul Moldovan, Dipl.-Ing. Benjamin Schmieder. E-Mobility will only …
High geometric fidelity through closed-loop control of the weld pool size in gas metal arc welding based direct energy …
The focus of this article is direct energy deposition (DED) with the use of a gas metal arc welding (GMAW) process, as this welding process combines flexibility and high efficiency [7]. The use of the GMAW process for direct energy deposition exploits the process knowledge and the characteristic advantages of the welding process [1] .
Post Weld Heat Treatment Effect on Welding Residual Stresses
The effects on welding residual stress due to a controlled post weld heat treatment (PWHT) in a furnace are indicated in BS 7910 and R6. For a controlled furnace PWHT in accordance with procedures such as those of PD 5500, the level of residual stress remaining in welds of carbon manganese and 2.25Cr1Mo steel after PWHT within the range of 580 ...
A review on TIG welding technology variants and its effect on weld …
Sl.no Author(s), year, [References] TIG welding technology Variants Material used Outcomes/ Findings of the study 1 Durgutlu et al. (2004), [4]Conventional TIG welding 4 mm thick 316L austenitic stainless steel Compared the effect of pure argon, 1.5% H 2 –Ar and 5% H 2 –Ar composition and stated improvement in melting efficiency with …
WeldNet: a lightweight deep learning model for welding defect recognition
Weld defect detection is an important task in the welding process. Although there are many excellent weld defect detection models, there is still much room for improvement in stability and accuracy. In this study, a lightweight deep learning model called WeldNet is proposed to improve the existing weld defect recognition network for its poor …
Leakage failure analysis of a 60 m3 LNG storage tank
This work aimed to analyze a leak that occurred in a 60 m 3 LNG storage tank made of 304 stainless steel. Optical microscopy (OM), scanning electron microscope …
Effect of welding parameters and the heat input on weld bead …
Welding of fillets in medium thickness steel (4–12 mm) with HLAW has been studied using Nd:YAG laser-MAG hybrid technology; welds with characteristics fulfilling shipyard specifications were produced. 1,3 In the previous studies, it has been noticed, e.g., that welding of a fillet joint is easy due the fact that weld is bending according to the joint, …
A Review of Magnetic Flux Leakage Nondestructive Testing
Magnetic flux leakage (MFL) testing is a widely used nondestructive testing (NDT) method for the inspection of ferromagnetic materials. This review paper presents the basic principles of MFL testing and summarizes the recent advances in MFL. An analytical expression for the leakage magnetic field based on the 3D magnetic dipole …
Laser Welding Aluminum | Aluminum Alloy Welding | EB Industries
Laser beam welding is one of our most popular services for welding aluminum. The process is ideal for fast, clean welds. The heat affected zone is minimized and weld penetration can range up to 0.25" in aluminum. Laser beam welding can be used with crack sensitive materials, such as the 6000 series of aluminum alloys when combined with an …
Numerical analysis and experimental research on detection of welding defects in pipelines based on magnetic flux leakage …
The welding seam coverage width on both sides of the groove is 1.5 mm, the width of the girth weld is 10.8 mm, and the reinforcement of the girth weld is 1.5 mm. Experimental studies have shown that, the MFL signal at …
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