butt welding
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2022 ◽  
Vol 65 (3) ◽  
pp. 1-2
Author(s):  
H. Dawood ◽  
Abbas Mohammad ◽  
Kanaan Musa ◽  
Nawras Sabeeh
Keyword(s):  

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 59
Author(s):  
Guowei Zhang ◽  
Feihu Yu

The application of thick metal plates is increasing, and the welding problem is becoming more and more prominent. Narrow gap laser welding is one of the important methods, and it is also a research hotspot. The stainless steel thick plates were welded using the ultra-narrow gap fiber laser conduction welding with filler wire. Results show that the ranges of technological parameters for the achievement of the weld seam with no defects are smaller when the gap width is comparatively larger. Using the optimized technological parameters, the butt welding with no defects on the 3 mm gap between two 304 stainless steel plates with 60 mm thickness was achieved through the filling 20 times. This welding method of 304 metal with large thickness is rare in the literature. The tensile strength of the welding joint can be up to 87% of that of the base metal, and the micro-hardness and yield strength of the joint are comparable with those of the base metal.


2021 ◽  
Vol 14 (1) ◽  
pp. 16
Author(s):  
Konstantin P. Kolotyrin ◽  
Sergey A. Bogatyrev ◽  
Yuri Yu. Kostyukhin ◽  
Diana Yu. Savon ◽  
Alexey I. Shinkevich

The article is devoted to the substantiation of technological foundations for the restoration of extremely worn-out, metal-consuming, and resource-consuming parts, in a method consisting of applying a compensating metal wear with subsequent plastic deformation. Currently, there are no technologies for their restoration in a repair facility that guarantee the resilience of the factory product. The proposed technological process of repair consists of butt welding onto the end of the spline semi-axle shank, compensating for the wear of the metal, the volume of which takes into account the losses resulting from the wear of the slots, as well as allowances for their machining. In the example of forging the axle shaft of a truck’s driving axle, the regularities of the plastic flow of metal during part deformation in the stamp are revealed. In the process of hot volumetric upsetting of long cylindrical parts with a variable diameter, it is important to know the possible directions of metal movements, as well as the energy-power characteristics of the process at various stages of forging. The evaluation criteria of the level of perfection of the technology were indicators of resource conservation and efficiency of the recovery route. The technological direction of the conducted research was analyzed, step by step, from the standpoint of saving repair materials and energy resources. The results of theoretical studies are crucial in the design of die tooling, for the manufacture of blanks, when restoring the rear axle shafts of trucks with pressure. Production tests carried out on the models, obtained as a result of mathematical processing of experimental data, confirmed the reliability of the experimental information. The introduction of the proposed set of repair equipment for the restoration of semi-axles will allow the formation of additional production in the region for the recycling of worn-out metal-intensive steel parts of agricultural machinery.


Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7699
Author(s):  
Jaewoong Kim ◽  
Changmin Pyo ◽  
Yonghyun Kim ◽  
Sungwook Kang ◽  
Taegon Yeo ◽  
...  

Nine percent nickel steel has excellent properties in a cryogenic environment, so it has recently been used as a tank material for most LNG fuel-powered ships. However, 9% nickel steel causes arc deflection due to its tendency of magnetization during manual FCAW welding and the currently used filler metal is 10–25 times more expensive as a base metal compared to other materials, depending on manufacturers. Furthermore, the properties of its filler metal cause limitation in the welding position. To overcome these disadvantages, in this study, the tendency of penetration shape was analyzed through a fiber laser Bead on Plate (BOP) welding for 9% nickel steel with a thickness of 6 mm and a range of welding conditions for 1-pass laser butt welding of 6 mm thick 9% nickel steel with I-Groove were derived. Through this study, basic data capable of deriving optimal conditions for laser butt welding of 9% nickel steel with a thickness of 6 mm were obtained.


Author(s):  
Soumyabrata Basak ◽  
Mounarik Mondal ◽  
Kun Gao ◽  
Sung-Tae Hong ◽  
Sam Yaw Anaman ◽  
...  

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Krzysztof Wałęsa ◽  
Krzysztof Talaśka ◽  
Dominik Wilczyński ◽  
Jan Górecki ◽  
Dominik Wojtkowiak

AbstractThe paper discusses the topic of butt welding of polyurethane drive belts by the hot plate method in the context of modeling the process of this technological operation. Based on the analysis of the butt welding process, a series of studies of the thermomechanical properties of the material from which the belt is made has been planned. The results will be used for mathematical modeling of the welding process, and in particular its most important phase: the plasticizing operation. On this basis, the study of the compression of cylindrical specimens taken from the belt has been performed at two different speeds. Their result is the relationship between the compressive stress σc and the modulus of longitudinal elasticity Ec at compression and: deformation εc, temperature value T, as well as the compressive velocity vc. In the next step, dynamic viscosity η of the belt material was determined based on the results of dynamic thermomechanical analysis. The research work culminated in the attempts to plasticize the material on a hot plate, in conditions similar to the process of industrial welding. These studies were performed at different speeds vpl, resulting in the correlation between the force required for plasticizing Fpl and the value of the speed of the belt end vpl relative to the hot plate heated to a temperature Tp. The obtained results will be used to formulate a mathematical model of plasticizing the material, based on the selected mechanical deformation models.


Author(s):  
Mohammad Tahran Hammoud ◽  
Ruslan Pcholkin

The paper considers the issues of planning an experimental tests of samples of short reinforced concrete supports for static effects. The procedure for determining the required number of samples and their preparation for testing is given. To determine the needed amount of supports the Latin square is used. The variable parameters for such type of construction are the followed: concrete class, the thickness of the expanded-exhaust sheet, the size of the cell of the average exhaust sheet, geometric parameters of the support (diameter and height), diameter and pitch of frame and the degree of adhesion of concrete to metal. Experimental samples are presented in three series: round concrete supports(6 pcs.), concrete supports in a mesh holder (6 pcs.) and concrete supports in a mesh holder supported by outer frames (6 pcs.). The height of each support is about 1000mm, the diameter is 450 mm. Based on the presented methodology, 18 prototypes were prepared for testing, which were made on the construction site of "Avantazh" ICC. For convenience of production of supports concreting is executed in a disposable cardboard framework. The diameter of the mesh holder is 400 mm, thus, the protective layer of concrete is 25 mm. The connection of the holder is made by butt welding without overlays. The frames are made of Ø12A400C reinforcement bars of periodic profile. Before conducting a series of experimental studies, standard tests of structural materials were performed, in particular, determination of the cubic strength of concrete. Simultaneously with the testing of standard samples of cubes, the establishment of the actual concrete classes of the test samples was performed using a non destructive test with the ONYX-2.5 device. Together with determining the concrete classes, geometrical characteristics of samples were defined. A P-500 hydraulic press for testing of building structures is used as the main power plant. The loading of the samples is planned to be realized stepwise through two headers in the form of steel disks till the moment of distruction.


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