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ARC welding method for bonding steel with aluminum

Zhenyang LU, Pengfei HUANG, Wenning GAO, Yan LI, Hanpeng ZHANG, Shuyan YIN

《机械工程前沿（英文）》 2009年 第4卷 第2期   页码 134-146 doi: 10.1007/s11465-009-0033-x

摘要： When welding steel with aluminum, the appearance of intermetallic compounds of Fe and Al will decrease tenacity and increase rigidity, which leads to bad joint performance. A new type of low energy input (LEI) welding technology is introduced which can be used to weld steel with aluminum. Using the technology, brazing was located on the steel side and arc fusion welding on the aluminum side. The less heat input reduces the thickness of intermetallic compounds to 3-4 μm. Tensile strength tests prove that the joint breaks at the heat-affected zone and the strength is higher than 70% of the aluminum’s. Thus, the method can lead to a good performance joint.

关键词： joining of steel and aluminum     low energy input welding     arc welding     fusion welding – brazing    

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低成本热轧双相钢焊接性能研究

董瑞峰,王国栋

《中国工程科学》 2014年 第16卷 第2期   页码 53-57

摘要：

研究了DP590 低成本热轧双相钢采用合适的焊丝、焊剂及合理的焊接工艺后，钢板焊接接头的拉伸性能、冲击韧性及硬度的变化情况。证明了实验钢具有优良的抗软化能力和冷弯成型性能且淬硬倾向不明显。实验表明，开发的DP590 低成本热轧双相钢焊接性能优良，适于焊接制造汽车车轮、横梁、纵梁等构件。

关键词： 低成本     双相钢     焊接性能    

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STRATEGIES FOR A LOW-CARBON FOOD SYSTEM IN CHINA

《农业科学与工程前沿（英文）》 2023年 第10卷 第2期   页码 167-182 doi: 10.15302/J-FASE-2023494

摘要：

● A provincial stage-specific greenhouse gas (GHG) accounting model for the Chinese food system was developed.

关键词： greenhouse gas emissions     food system     life cycle assessment     environmental input-output analysis     mitigation strategies    

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Energy transition management towards a low-carbon world

《工程管理前沿（英文）》 2022年 第9卷 第3期   页码 499-503 doi: 10.1007/s42524-022-0201-9

关键词： energy transition     low-carbon technology     system modeling     transition path     emission reduction    

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农业生态工程中人工辅助能产投比的计算分析研究

卞有生,柳英昆,卞晶

《中国工程科学》 2006年 第8卷 第8期   页码 28-32

摘要：

人工辅助能产投比的高低从总体上反映了农业生态系统的功能和生产效率，是系统结构功能的体现，是评价农业生态工程的重要指标。文章以河南新县10户农民为案例，具体介绍了人工辅助能产投比的计算研究方法，并报告了连续3年的研究结果。

关键词： 农业生态工程     能量产投比    

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Early-life famine exposure, adulthood obesity patterns, and risk of low-energy fracture

《医学前沿（英文）》 doi: 10.1007/s11684-023-1023-9

摘要： Malnutrition in early life increases the risk of osteoporosis, but the association of early-life undernutrition combined with adulthood obesity patterns with low-energy fracture remains unknown. This study included 5323 community-dwelling subjects aged ≥40 years from China. Early-life famine exposure was identified based on the participants’ birth dates. General obesity was assessed using the body mass index (BMI), and abdominal obesity was evaluated with the waist-to-hip ratio (WHR). Low-energy fracture was defined as fracture occurring after the age of 40 typically caused by falls from standing height or lower. Compared to the nonexposed group, the group with fetal, childhood, and adolescence famine exposure was associated with an increased risk of fracture in women with odds ratios (ORs) and 95% confidence intervals (CIs) of 3.55 (1.57–8.05), 3.90 (1.57–9.71), and 3.53 (1.05–11.88), respectively, but not in men. Significant interactions were observed between fetal famine exposure and general obesity with fracture among women (P for interaction = 0.0008). Furthermore, compared with the groups with normal BMI and WHR, the group of women who underwent fetal famine exposure and had both general and abdominal obesity had the highest risk of fracture (OR, 95% CI: 3.32, 1.17–9.40). These results indicate that early-life famine exposure interacts with adulthood general obesity and significantly increases the risk of low-energy fracture later in life in women.

关键词： famine     obesity     body mass index     waist-to-hip ratio     low-energy fracture    

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Correlation between carbon emissions and energy structure –Reliability analysis of low carbon target

Ben HUA

《能源前沿（英文）》 2011年 第5卷 第2期   页码 214-220 doi: 10.1007/s11708-010-0133-7

摘要： The influence of energy intensity on carbon intensity depends upon the fraction of energy mixes with high carbon emissions in the total energy mixes . The correlation of with a variety of primary energy mix fractions and technology advances such as CCS and CCHP is analyzed and deduced. Taking the long-term carbon reduction target in 2050 settled upon by the Copenhagen Agreement and the mid-term target suggested by the “450 Scenes Program” of the International Energy Agency (IEA) as constraints, the new pattern of the energy transition of the world in 2020, 2030, and 2050 are estimated and figured out. The peak value of energy consumption will lag behind the peak value of carbon emissions; the world energy structure shifting point will be in 2020–2025. Estimates show that China’s mid-2020 and long-term targets of energy-saving and emission reduction announced by the Chinese government might be achieved.

关键词： correlation     carbon emissions     energy consumption     high carbon emissions energy mix     target of emission reduction     reliability    

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Practice on Ultra-low Emission and Energy Efficient Technologies in Coal-fired Power Plants

Yin-biao Chen,Yi Zhang,Wen Ling

《工程管理前沿（英文）》 2016年 第3卷 第4期   页码 377-383 doi: 10.15302/J-FEM-2016045

摘要： Restructuring of China’s energy mix is accelerating due to factors such as energy security, economic cost, climate change and environmental pressure. Efficient and clean utilization of coal-generated power therefore plays an increasingly important role in solving energy and environmental problems in China. Coal-fired power plants, with Shenhua Guohua Sanhe as one of the pioneers, followed trend of this era and adopted multiple ultra-low emission and energy efficient technologies, striving to be an industry leader in environmental protection, profitability and innovation. As a result, coal-fired power plants have seen ultra-low emissions of air pollutants and record-high energy efficiency, opening up a new era of more efficient and cleaner coal generation. By the end of 2015, Shenhua Group had had 45 ultra-low emission coal units, providing strong support for implementing of the national policy on ultra-low emission and energy efficient retrofit of coal-fired power plants across China.

关键词： coal     power generation     ultra-low emission     energy efficiency    

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Study of mechanism of activating flux increasing weld penetration of AC A-TIG welding for aluminum alloy

HUANG Yong, FAN Ding, FAN Qinghua

《机械工程前沿（英文）》 2007年 第2卷 第4期   页码 442-447 doi: 10.1007/s11465-007-0076-9

摘要： When multi-component flux AF305 is used as surface activating flux for an aluminum alloy, the weld pene tration of activating flux-tungsten inert-gas (A-TIG) welding is over two times more than that of conventional TIG welding. Using A-TIG welding with the modes of alternating current (AC), direct current electrode negative (DCEN) and direct current electrode positive (DCEP), respectively, the flux differently affects weld penetration when the polarity is different. After studied the effect of compelled arc con striction on weld penetration of AC welding, it is believed that the constriction of the whole arc root is not the main mechanism that flux AF305 dramatically improves weld penetration. The penetration has a relationship with the separate distribution of slag on the weld surface. Then, an observation of scanning electron microscopy (SEM) and an electronic data systems (EDS) analysis of slag were performed respectively. The separate distribution of slag on the weld pool during welding and the great constriction of arc spots were confirmed by TIG welding with helium shielding gas. The relationship between slag distribution and weld penetration was studied by adding aluminum powder into flux AF305 to change the distribution of slag. During welding, the separate distribution of slag on the weld pool results in the great constriction of arc spots, an increase in arc spot force, and an increase in Lorentz force within the arc and weld pool. Finally, the weld penetration is increased.

关键词： A-TIG welding     surface     DCEN     electrode negative     increase    

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基于DBN模型的激光焊接状态在线监控研究 Article

张艳喜, 游德勇, 高向东, Seiji Katayama

《工程（英文）》 2019年 第5卷 第4期   页码 671-678 doi: 10.1016/j.eng.2019.01.016

摘要：

本文开发了集辅助激光成像系统、紫外/可见波段视觉成像系统（波长小于780 nm）、光谱测量仪、光电传感器的多传感器系统，用以观察和分析激光焊接过程中的焊接状态信息。本文采用小波包分解方法对通过光电传感器获得的可见光波段传感信号和激光反射传感信号进行分解并提取相关特征。光谱仪采集到的信号的主要波长为400~900 nm，将其分为25个子带并采用统计方法来提取光谱信号特征。利用紫外/可见波段视觉成像系统采集的图像获取金属蒸气和飞溅的特征，而辅助照明视觉传感器系统主要是用来采集匙孔特征。本文基于上述焊接过程的实时量化特征建立了焊接状态监测的深度信念网络（DBN），并采用遗传算法对所提出的DBN模型参数进行优化。与传统的反向传播神经网络（BPNN）模型相比，本文建立的DBN模型在焊接状态监测方面具有更高的精度和鲁棒性。最后，本文通过三个附加焊接试验验证了该方法在激光焊接状态监控中的有效性和泛化能力。

关键词： 在线监控     多传感     小波包分解     深信度网络    

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Fuel poverty and low carbon emissions: a comparative study of the feasibility of the hybrid renewableenergy systems incorporating combined heat and power technology

《能源前沿（英文）》 2022年 第16卷 第2期   页码 336-356 doi: 10.1007/s11708-021-0748-x

摘要： Fuel poverty is most prevalent in North East England with 14.4% of fuel poor households in Newcastle upon Tyne. The aim of this paper was to identify a grid connected renewable energy system coupled with natural gas reciprocating combined heat and power unit, that is cost-effective and technically feasible with a potential to generate a profit from selling energy excess to the grid to help alleviate fuel poverty. The system was also aimed at low carbon emissions. Fourteen models were designed and optimized with the aid of the HOMER Pro software. Models were compared with respect to their economic, technical, and environmental performance. A solution was proposed where restrictions were placed on the size of renewable energy components. This configuration consists of 150 kW CHP, 300 kW PV cells, and 30 kW wind turbines. The renewable fraction is 5.10% and the system yields a carbon saving of 7.9% in comparison with conventional systems. The initial capital investment is $1.24 million which enables the system to have grid sales of 582689 kWh/a. A conservative calculation determined that 40% of the sales can be used to reduce the energy cost of fuel poor households by $706 per annum. This solution has the potential to eliminate fuel poverty at the site analyzed.

关键词： greenhouse gas control     low carbon target     grid connected     renewable fraction     fuel poverty     combined heat and power     HOMER Pro    

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Offline motion planning and simulation of two-robot welding coordination

Tie ZHANG, Fan OUYANG

《机械工程前沿（英文）》 2012年 第7卷 第1期   页码 81-92 doi: 10.1007/s11465-012-0309-4

摘要：

This paper focuses on the two-robot welding coordination of complex curve seam which means one robot grasp the workpiece, the other hold the torch, the two robots work on the same workpiece simultaneously. This paper builds the dual-robot coordinate system at the beginning, and three point calibration method of two robots’ relative base coordinate system is presented. After that, the non master/slave scheme is chosen for the motion planning, the non master/slave scheme sets the poses versus time function of the point u on the workpiece, and calculates the two robot end effecter trajectories through the constrained relationship matrix automatically. Moreover, downhand welding is employed which can guarantee the torch and the seam keep in good contact condition all the time during the welding. Finally, a Solidworks-SimMechanics simulation platform is established, and a simulation of curved steel pipe welding is conducted. The results of the simulation illustrate the welding process can meet the requirements of downhand welding, the joint displacement curves are smooth and continuous and no joint velocities are out of working scope.

关键词： complex curve seam     two robots     coordinated welding     motion planning    

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Synergistic utilization of coal and other energy – Key to low carbon economy

Weidou NI, Zhen CHEN

《能源前沿（英文）》 2011年 第5卷 第1期   页码 1-19 doi: 10.1007/s11708-010-0136-4

摘要： In China, coal is a dominant component of energy mix, and it is expected to remain as such over the next 30 to 40 years. Coal is expected to be used even more in power generation. The direct combustion of coal already has been causing severe pollution and ecological degradation, and it is quite difficult to address the need to reduce greenhouse gas (GHG) given the direct combustion of coal. Therefore, the polygeneration system based on coal gasification, which is one of the major examples of synergistic utilization of coal, is proposed. It is a comprehensive solution to meet the energy challenges China is facing. Furthermore, the synergy of fossil fuels (especially coal) with renewable energy, the synergy of different kinds of energy for energy storage, the synergy of centralized and distributed supply of different kinds of energy, and the synergy of different kinds of energy in smart energy grid (power, gas, heat, and water) are the keys to making China a low-carbon economy. Carbon dioxide (CO ) mitigation in China should begin from the coal-chemical industry given their accumulated relevant experiences. The mitigation process should gradually be transformed into the “IGCC+ polygeneration+ CCUS”. The objectives of this paper are to describe the synergistic utilization of coal, and to analyze the synergy of coal with other energy resources, and to propose the scientific and technological problems to achieve these synergies.

关键词： synergy     clean and efficient utilization of coal     coal-based polygenration     CO2 mitigation     energy storage    

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Review on electromagnetic welding of dissimilar materials

K. SHANTHALA,T. N. SREENIVASA

《机械工程前沿（英文）》 2016年 第11卷 第4期   页码 363-373 doi: 10.1007/s11465-016-0375-0

摘要：

Electromagnetic welding (EMW) is a high-speed joining technique that is used to join similar or dissimilar metals, as well as metals to non-metals. This technique uses electromagnetic force to mainly join conductive materials. Unlike conventional joining processes, the weld interface does not melt, thus keeping the material properties intact. Extremely high velocity and strain rate involved in the process facilitate extending the EMW technique for joining several materials. In this paper, the research and progress in electromagnetic welding are reviewed from various perspectives to provide a basis for further research.

关键词： electromagnetic     welding     impact     dissimilar materials    

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Structure and performance of welding joint of Q235 steel welded by SHS welding

Junzhi HU, Sumei WANG, Xiaoli ZHAO, Shilin ZHU, Botao YU,

《机械工程前沿（英文）》 2010年 第5卷 第2期   页码 189-193 doi: 10.1007/s11465-010-0003-3

摘要： A self-propagating high-temperature synthesis (SHS) welding-pen that can weld steel workpiece from 6 to 10 mm is developed and welds the Q235 steel. The structure and properties of the welding joint are studied. The result indicates that this type of welding is melting and the fusion zone is clear. The tensile-strength of the welding joint is 283 MPa, flexural strength is 628 MPa, impact toughness is 46.43 J·cm, and the microhardness of the welding joint and fusion zone are 230 HV and 255.6€HV, respectively. The mircohardness of the fusion zone and the welding line are higher than that of the matrix.

关键词： self-propagating high-temperature synthesis (SHS) welding     welding line     structure and performance     melting    

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标题 作者 时间 类型 操作

ARC welding method for bonding steel with aluminum

Zhenyang LU, Pengfei HUANG, Wenning GAO, Yan LI, Hanpeng ZHANG, Shuyan YIN

期刊论文

低成本热轧双相钢焊接性能研究

董瑞峰,王国栋

期刊论文

STRATEGIES FOR A LOW-CARBON FOOD SYSTEM IN CHINA

期刊论文

Energy transition management towards a low-carbon world

期刊论文

农业生态工程中人工辅助能产投比的计算分析研究

卞有生,柳英昆,卞晶

期刊论文

Early-life famine exposure, adulthood obesity patterns, and risk of low-energy fracture

期刊论文

Correlation between carbon emissions and energy structure –Reliability analysis of low carbon target

Ben HUA

期刊论文

Practice on Ultra-low Emission and Energy Efficient Technologies in Coal-fired Power Plants

Yin-biao Chen,Yi Zhang,Wen Ling

期刊论文

Study of mechanism of activating flux increasing weld penetration of AC A-TIG welding for aluminum alloy

HUANG Yong, FAN Ding, FAN Qinghua

期刊论文

基于DBN模型的激光焊接状态在线监控研究

张艳喜, 游德勇, 高向东, Seiji Katayama

期刊论文

Fuel poverty and low carbon emissions: a comparative study of the feasibility of the hybrid renewableenergy systems incorporating combined heat and power technology

期刊论文

Offline motion planning and simulation of two-robot welding coordination

Tie ZHANG, Fan OUYANG

期刊论文

Synergistic utilization of coal and other energy – Key to low carbon economy

Weidou NI, Zhen CHEN

期刊论文

Review on electromagnetic welding of dissimilar materials

K. SHANTHALA,T. N. SREENIVASA

期刊论文

Structure and performance of welding joint of Q235 steel welded by SHS welding

Junzhi HU, Sumei WANG, Xiaoli ZHAO, Shilin ZHU, Botao YU,

期刊论文