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压接参数和热处理对铬钼低碳钢压焊接头力学性能的影响 被引量:2
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作者 张远 张鹏 +1 位作者 黄威 王朝阳 《热加工工艺》 CSCD 北大核心 2017年第7期94-96,100,共4页
分别以未经热处理的试件相互压接、未经热处理与热处理试件压接、经热处理的试件相互压接等三种条件进行了铬钼低碳钢的压焊试验,研究了不同工艺参数和热处理对铬钼低碳钢压焊接头性能的影响。结果表明:压接焊缝的毛边直径随着压接压力... 分别以未经热处理的试件相互压接、未经热处理与热处理试件压接、经热处理的试件相互压接等三种条件进行了铬钼低碳钢的压焊试验,研究了不同工艺参数和热处理对铬钼低碳钢压焊接头性能的影响。结果表明:压接焊缝的毛边直径随着压接压力及压接长度的增加而增加;经热处理的试件相互压接时,由于接合区域产生的高热量和重熔作用,使焊缝硬度小于热处理后母材的硬度,硬度分布呈"V"字型,而焊后再进行热处理可提高焊缝的硬度。经热处理后试件压接接头的强度要明显高于其他两种试件的压接接头,其拉伸断口组织较为细密,断裂特征为形状不规则的扇形韧性破裂。 展开更多
关键词 铬钼低碳钢 压接参数 热处理
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输电线路压缩型耐张线夹工程失效研究进展
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作者 安利强 罗益鑫 +2 位作者 李渊 朱登杰 黄增浩 《南方电网技术》 CSCD 北大核心 2024年第4期152-161,共10页
输电线路中耐张线夹需求量巨大,但线夹失效事故发生频繁,这不仅带来了经济损失,还严重威胁到电网的可靠运行。为解释压缩型耐张线夹的失效机理,提高输电线路的安全性,国内外学者展开了大量的研究。从失效事故方面综述了压缩型耐张线夹... 输电线路中耐张线夹需求量巨大,但线夹失效事故发生频繁,这不仅带来了经济损失,还严重威胁到电网的可靠运行。为解释压缩型耐张线夹的失效机理,提高输电线路的安全性,国内外学者展开了大量的研究。从失效事故方面综述了压缩型耐张线夹的过热和断裂两类工程失效类型,从工程分析和机理研究方面综述了两类工程失效类型的失效机理,从压接工艺研究方面综述了压接工艺参数对失效形式的影响,并从常规检测以及无损检测两个角度综述耐张线夹的质量检测研究现状。最后,基于目前偏于定性分析的耐张线夹工程失效研究,对耐张线夹失效机理的进一步研究提出了展望。 展开更多
关键词 耐张线夹 失效机理 工艺参数 无损检测
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卷绕机接压参数的设定分析
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作者 李双庆 郭怡 +1 位作者 高红阳 张鲁湘 《河南化工》 CAS 2003年第11期39-39,共1页
介绍了卷绕机的接压原理 ,阐述了接压参数的设定原则 。
关键词 卷绕机 参数
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棒形悬式复合绝缘子端部连接的探讨 被引量:3
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作者 张海兵 黄坤 何庆文 《电瓷避雷器》 CAS 北大核心 2009年第5期15-20,共6页
简要说明了棒形悬式复合绝缘子端部连接采用的楔接、粘接、同轴多向压接三种连接形式,以及各自的优缺点。详细分析了同轴多向压接工艺,通过简要的设计计算和参考大量的实验数据,提出了同轴多向压接棒形悬式复合绝缘子,端部附件结构设计... 简要说明了棒形悬式复合绝缘子端部连接采用的楔接、粘接、同轴多向压接三种连接形式,以及各自的优缺点。详细分析了同轴多向压接工艺,通过简要的设计计算和参考大量的实验数据,提出了同轴多向压接棒形悬式复合绝缘子,端部附件结构设计的重点和关键压接参数的计算确定。介绍了压接过程的无损监控检测工艺,指出棒形悬式复合绝缘子端部连接应选用同轴多向压接,采用压缩量控制,压力值校对,压接时间分析,并配备同步的声发射检测设备。 展开更多
关键词 复合绝缘子 同轴多向 端部附件 压接参数 无损检测 声发射系统
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Study on the resistance spot welding technology of 22MnMoB hot stamping quenched steel 被引量:2
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作者 Feng Yi Ma Mingtu +3 位作者 Hua Fu'an Zhang Junping Song Leifeng Jin Qingsheng 《Engineering Sciences》 EI 2014年第5期45-53,共9页
In this paper, the spot welding technology of a new kind of 22MnMoB hot stamping quenched steel sheet was systematically studied by power frequency spot welder. Through a series of technology and test experiments, we ... In this paper, the spot welding technology of a new kind of 22MnMoB hot stamping quenched steel sheet was systematically studied by power frequency spot welder. Through a series of technology and test experiments, we have obtained the optimal spot welding technological parameter condition. According to the results, the relations among spot welding technological parameter, welding nugget, mechanical property and fracture mode were discussed. The effects of all the welding parameters such as welding current, welding time and electrode force on the quality of joint can be boiled down to one thing--the diameter of welding nugget. The experimental results showed that welding nugget diameter determines the mechanical property of spot welding joint and the relation between welding nugget diameter and the mechanical property of joint presents a kind of linear mathematic representation. There are two typical fracture models of 22MnMoB hot stamping quenched steel sheet, i.e., interracial fracture and nugget pullout. Other than mild steel or normal high strength steel, in the shearing tensile test, hot stamping quenched steel has a great tendency to fail in interfacial mode due to the effects of high strength matrix structure, welding soft zone and the porosity level of fusion zone. 展开更多
关键词 hot stamping quenched steel resistance spot welding maximum shearing force nugget diameter soft zone fracture mode
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Effects of process parameters and die geometry on longitudinal welds quality in aluminum porthole die extrusion process 被引量:2
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作者 刘健 林高用 +2 位作者 冯迪 邹艳明 孙利平 《Journal of Central South University》 SCIE EI CAS 2010年第4期688-696,共9页
By using the rigid-visco-plasticity finite element method, the welding process of aluminum porthole die extrusion to form a tube was simulated based on Deform-3D software. The welding chamber height (H), back dimens... By using the rigid-visco-plasticity finite element method, the welding process of aluminum porthole die extrusion to form a tube was simulated based on Deform-3D software. The welding chamber height (H), back dimension of die leg (D), process velocity and initial billet temperature were used in FE simulations so as to determine the conditions in which better longitudinal welding quality can be obtained. According to K criterion, the local welding parameters such as welding pressure, effective stress and welding path length on the welding plane are linked to longitudinal welds quality. Simulation turns out that pressure-to-effective stress ratio (ρ/σ) and welding path length (L) are the key factors affecting the welding quality, Higher welding chamber best and sharper die leg give better welding quality. When H=10 mm and D=0.4 mm, the longitudinal welds have the best quality. Higher process velocity decreases welds quality. The proper velocity is 10 mm/s for this simulation. In a certain range, higher temperature is beneficial to the longitudinal welds. It is found that both 450 and 465℃ can satisfy the requirements of the longitudinal welds. 展开更多
关键词 aluminum alloy longitudinal welds porthole die die geometry extrusion process K criterion
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Multi-objective optimization of crimping of large-diameter welding pipe
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作者 范利锋 高颖 +1 位作者 云建斌 李志鹏 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第7期2540-2548,共9页
Crimping is widely adopted in the production of large-diameter submerged-arc welding pipes. Traditionally, designers obtain the technical parameters for crimping from experience or by trial and error through experimen... Crimping is widely adopted in the production of large-diameter submerged-arc welding pipes. Traditionally, designers obtain the technical parameters for crimping from experience or by trial and error through experiments and the finite element(FE) method. However, it is difficult to achieve ideal crimping quality by these approaches. To resolve this issue, crimping parameter design was investigated by multi-objective optimization. Crimping was simulated using the FE code ABAQUS and the FE model was validated experimentally. A welding pipe made of X80 high-strength pipeline steel was considered as a target object and the optimization problem for its crimping was formulated as a mathematical model and crimping was optimized. A response surface method based on the radial basis function was used to construct a surrogate model; the genetic algorithm NSGA-II was adopted to search for Pareto solutions; grey relational analysis was used to determine the most satisfactory solution from the Pareto solutions. The obtained optimal design of parameters shows good agreement with the initial design and remarkably improves the crimping quality. Thus, the results provide an effective approach for improving crimping quality and reducing design times. 展开更多
关键词 crimping welding pipe optimization grey system theory genetic algorithm
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