This paper discusses the current development status of dissimilar metal welding of aluminum/steel, and focuses on introducing the research methods and achievements of aluminum/steel composite welding in four fields: rotary friction welding of aluminum/steel, laser melt brazing of aluminum/steel, laser deep penetration welding of aluminum/steel and resistance spot welding of aluminum/steel. Finally, the problems existing in the promising processes of rotary friction welding of aluminum/steel dissimilar metals and resistance spot welding of aluminum/steel dissimilar materials are prospected.

By comparing the latest Chinese national standard (GB) and the American standard (ASTM) regarding the standard system, test mechanism, material sampling method, and inspection and evaluation of the bending forming test of copper and gold strips, the main differences in the bending forming test of copper strips between the two countries are identified. In terms of the strictness of the bending forming performance test of copper strips and the reliability of the products, GB/T15825.5-2008is stricter and more reliable than GB/T232-2024, and ASTM B820-23 is stricter and more reliable than GB/T15825.5-2008.

In this paper, YS/T 1690-2024“Evaluation requirements for green factory in magnesium and magnesium alloy plate and strip industry are interpreted. This paper introduces the research results of green factory evaluation index system in magnesium and magnesium alloy plate and strip industry, the key points of green factory establishment and the green level that should be achieved. The main technical content, standard level and innovation point of the standard are analyzed. The significance of standard-setting and issuing is expounded. This paper can contribute greatly to carry out energy conservation and emission reduction, green and low-carbon development, the construction of green factory and so on for the magnesium and magnesium alloy plate and strip industry.

This paper designs an algorithm for recognizing personnel operation behaviors in the processing and production scenarios of non-ferrous metals. This algorithm introduces the spatio-temporal attention mechanism and feature pyramid, achieving multi-scale processing of the visual frequency band and full utilization of complex spatio-temporal information, and standardizing the operation actions of workers.

Taking ZrB2/7055Al composite material as the research object, this paper explores the influence of hot rolling deformation amounts (50%, 80% and 90%) on the microstructure and mechanical properties of the composite material through analysis and testing methods such as OM, SEM observation and room-temperature stretching. The results show that hot rolling deformation improves the microstructure distribution and enhances the mechanical properties. The ZrB2 aggregates have changed from being initially distributed at the grain boundaries to being distributed along the RD direction of rolling. The phenomenon of particle agglomeration has been alleviated, and dynamic recrystallization has significantly refined the grains. Among them, at 80% of the deformation amount, the average grain size decreased from 84μm in the unchanged form to 32μm. the tensile strength, yield strength and elongation are 730MPa, 643 MPa and 9.3% respectively. The number of dimps in the fracture morphology is the largest and the deepest. The fracture form is ductile fracture, and the microstructure distribution and mechanical properties are the best.

In this paper, the TC6 titanium alloy is subjected to double annealing treatment. Under the condition of the change in the first annealing temperature, the microstructure and tensile properties of the double-annealed TC6 titanium alloy are studied. It is found that during the increase of the first annealing temperature, the primary α phase gradually transformed into the β phase, more secondary α phases precipitated in the microstructure and β grains with clear grain boundary contours appeared, presenting continuous α phase inlays on the β grain boundaries. The tensile strength and yield strength of the alloy keep increasing with the increase of the first annealing temperature, but the elongation after fracture shows a continuous decreasing trend with the increase of the first annealing temperature. When the initial annealing temperature is relatively low, the fracture surface is occupied by equiaxed dimples of various sizes, and the fracture form is mainly ductile fracture. However, when the initial annealing temperature is relatively high, it is found that the dimple morphology in the fracture surface is replaced by the rock-like morphology, with only a small number of dimps distributed on the surface of the rock-like morphology, accompanied by the appearance of micropores and tear ridges.

The article tests the effects of two Si addition methods and two modifiers on the composition and microstructure of 4004 alloy, and conducts a systematic analysis from aspects such as chemical composition, microstructure and comprehensive cost. The results show that the addition of silicon should comprehensively consider factors such as melting efficiency, energy consumption and environmental protection, and the selection of modifiers should comprehensively consider factors such as incubation time, modification effect and production cost.

In this paper, stereomicroscopes, scanning electron microscopes, optical microscopes, etc. are used to analyze the macroscopic morphology, microscopic morphology, micro-area composition and microstructure at the defect sites of aluminum alloy parts. Combined with the production and processing technology of the parts, the causes of the defects are analyzed. The results show that due to incomplete slag removal from the melt, the inclusions introduced during the smelting process and the online slag removal process exist in the form of non-metallic oxides in the melt, disrupting the continuity of the matrix. These non-metallic inclusions connot be removed in the subsequent processing and form surface defects after machining.

In this paper, SEM and EDS analysis methods are adopted to analyze the hot-rolled cracking area of C19400 and the corresponding billets. The results show that the main cause of cracking is the local presence of oxide inclusions and coarse Fe phase in the ingot. During the hot rolling deformation process, due to improper control of the rolling process, surface cracks are formed on the surface of the hot-rolled strip billet. The causes of cracking are analyzed and discussed, and corresponding improvement and preventive measures are proposed from the aspects of raw material control, casting process and hot rolling process.

This article analyzes the application scenarios of the aluminum strip straight head straightening machines, introduces the straightening principles and classifications of straightening machines, summarizes the design methods of key parameters of straightening machines based on examples, explains the structure and existing problems of the original straight head straightening machine in combination with production practice, and optimizes the structure design in response to the problems.

Aiming at the pain points of the traditional roller changing device, such as low efficiency, single time consumption ≥30 minutes, strong reliance on human power and insufficient positioning accuracy, this paper proposes a fully automatic disassembly and assembly device based on multi-station collaborative control, providing key technical support for the intelligent upgrade of industrial equipment.

This paper combines the production scenarios of aluminum sheet and strip processing enterprises, and focuses on the actual industrial scenarios where the shape, color, size, and background of aluminum coil materials are difficult to separate. Machine vision technology and CNN model algorithms are used to identify and locate aluminum coils.The system automatically identifies and locates aluminum coils through a video surveillance system, meeting the specific scene requirements that conventional material identification technologies cannot meet. The system is developed for software based on a general operating system and development tools, and has a good adaptability to industrial scenarios.

This paper designs an algorithm for recognizing personnel operation behaviors in the processing and production scenarios of non-ferrous metals. This algorithm introduces the spatio-temporal attention mechanism and feature pyramid, achieving multi-scale processing of the visual frequency band and full utilization of complex spatio-temporal information, and standardizing the operation actions of workers.

his paper proposes the smoke collection form of the integral exhaust hood on the workshop roof, analyzes and studies the collection performance of the exhaust hood, and explores the relationship between the partition position and the collection efficiency. The results show that the roof integral smoke exhaust hood is feasible for implementation in the melting and casting workshop using the circular aluminum melting furnace, which can significantly improve the environmental conditions of the workshop. Compared with the traditional mechanical exhaust, the collection efficiency has increased by 15.3%. By adjusting the position of the partition, the capture efficiency can reach 99.9%.