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《机械制造文摘-焊接分册》2014,(4)
正异种难焊材料的焊接及工程应用李亚江、王娟等编著*本书针对工程结构中异种材料的焊接特点、焊接材料的选用和焊接工艺要点等进行分析,突出了异种材料在各工程领域中的应用,力求突出新颖性、实用性和先进性等特色。给出了具体的焊接工艺参数、相关技术数据及针对一些典型异种材料工程结构的焊接应用实例,可以指导焊接生产和新产品开发。本书内容涉及的是生产一线的焊接工作者经常遇到的焊接问题,为读者掌握异种材料的焊接及应用提供理论基础和实践中成功的经验。 相似文献
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真空电子束焊接具有高能量密度、束斑直径和位置精确可控,焊接残余应力小,焊缝无污染等优点,因此,电子束焊接在异种材料连接领域的应用成为近年来研究的热点,并取得了大量的研究成果,部分已经在工业生产中得到了应用.由于电子束焊接属于熔化焊接,因此在异种金属连接中也存在冶金过程带来的困难.文中对异种材料的真空电子束焊接的研究现状进行了分析,对不同类型的异种材料接头真空电子束焊接中存在的问题和解决方法进行了总结,并提出了今后异种材料真空电子束焊接的研究重点. 相似文献
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由于异种钢理化特性的差异,在焊接过程中导致焊接接头的界面分布和裂纹失效机理与同种钢有所不同。文中从异种钢焊接接头的失效机制入手,介绍碳迁移导致熔合区出现软化和脆化现象,分析在焊接过程中导致其力学性能降低的本质原因,详细解释Type-II晶界和“白亮层”的形成机理,分析在高应力水平下异种钢焊接裂纹的形成机理和抑制措施。通过对异种钢焊接接头失效的本质原因进行系统性论述,为异种钢焊接失效机制的深入研究和工程应用提供理论指导,并提出针对异种钢焊接接头常见失效问题的解决方案。
创新点: (1)从焊缝过渡区域的特性着手,分析异种钢焊接接头失效机制的研究进展,提出抑制过渡区域中Type-II晶界的形成、缩小“白亮层”的宽度是提高焊接接头性能的关键措施。通过整理前人对异种钢焊接过程中的碳迁移过程的定量研究,明确了由于碳迁移造成的异种钢焊接接头软化和脆化机理。(2)提出基于精确施加冷源从而定量控制焊接热应力和残余应力的分布情况,是可能改善异种钢焊接裂纹失效问题的有效措施。 相似文献
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《热加工工艺》2017,(17)
以三种不同的异种金属焊丝和同质焊丝为填充材料,采油手工钨极氩弧焊(TIG)的方法对X65管线钢进行了焊接处理,对比分析了不同填充材料下焊接接头的显微组织、力学性能和耐腐蚀性能。结果表明,三种异种焊丝的焊接接头的焊缝组织都是以马氏体为主,并含有少量残余奥氏体,而同质焊丝焊接接头的焊缝组织为针状铁素体和贝氏体;异种焊丝焊接接头的屈服强度和抗拉强度都高于同质焊丝焊接接头,且随着焊丝中Cr/Ni比例的增加,异种焊丝焊接接头的的屈服强度和抗拉强度逐渐增加;三种异种焊丝焊接接头的耐腐蚀性能优于同质焊丝焊接接头,且随着异种焊丝中Cr/Ni比例的增加,焊接接头的耐腐蚀性能变好。 相似文献
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正单一金属结构通常很难满足工业生产的需求,而异种材料的焊接结构能够兼有两种材料的优点,能最大限度的降低成本和提升结构性能。在航空航天发动机制造中常采用异种金属的组合结构来保证其冷却高强与轻量化的综合性能。异种金属焊接一直是焊接领域的热点与难点之一。异种金属间的热物理性能与化学结晶性能的差异导致其焊接冶金相容性差,易在接头处萌生裂纹,弱化了焊接接头性能。基于异种金属的冶金特点和焊接结构特征,通常采用钎焊及固相连接的方法来解决异种金属的连接问题。目前,异种金属的熔焊连接 相似文献
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本文对异种金属(铝-钢、铜-钢、钛-钢、Mg/Al、Ti/Al、Cu/Al)的焊接研究现状、异种金属的焊接应用、异种金属的焊接发展等方面进行了分析,希望对异种金属的焊接研究有所裨益。 相似文献
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Artificial neural networks have been studied for applicability for modeling of spot welding process. Some basic concepts relating to neural networks are explained as well as how they can be used to model welding quality parameters in terms of the welding process parameter. The performance of the neural networks for modeling is presented and evaluated using actual welding data. It is concluded that neural network modeling is a good means of estimating spot welding quality on-line. 相似文献
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The present study investigates the friction stir welding (FSW) process of extremely curved surfaces using a high payload industrial robot. The welding process of aluminum alloys in a butt joint configuration has been investigated over convex surface radii ranging from 104.5 to 14.5 mm. The weld qualities of the produced joints have been assessed by macrographs and tensile tests. It was shown that the FSW process needs an optimization of the welding path as well as an optional adaptation of the process parameters in the curved region in order to produce sound and reproducible joints without inner or outer defects. The results contribute to further fields of application where non-linear welds have to be produced. 相似文献
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A lot of experimental methods have been brought forth to assess the dynamic character of the arc welding power source, but up to now, this issue has not been solved very well. In this paper, based on the fuzzy logic reasoning method, a dynamic character assessing model for the arc welding power source was established and used to analyze the dynamic character of the welding power source. Three different types of welding machine have been tested, and the characteristic information of the electrical signals such as re-striking arc voltage, low welding current and so on of the welding process were extracted accurately by using a self-developed welding dynamic arc wavelet analyzer. The experimental results indicate that this model can be used as a new assessing method for the dynamic character of the arc welding power source. 相似文献
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介绍了一种新型铸件补焊机的研制过程、设备的组成、工作原理以及主要特点 ,并介绍了用补焊机进行的常规的补焊工艺和典型应用实例 相似文献
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For high-power CO_2 laser welding, besides two well known stable welding processes, i.e. stable deep penetration welding (DPW) and stable heat conduction welding (HCW), the authors have found the third welding process, i.e. unstable-mode welding (UMW) under the certain condition. UMW has its basic feature that the two welding modes (DPW and HCW) appear intermittently, with jumping of penetration depth and weld width between large and small levels. In this paper, effects of welding parameters (focal position, laser power and traveling speed) on laser welding mode and weld appearance have been comprehensively studied Double-U curves of laser welding mode transition have been obtained, which indicate the ranges of the three mentioned welding processes. This work affords science foundation for selecting the welding process parameters correctly and obtaining stable laser welding. 相似文献
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主要介绍600MW改进机组高压内缸铸件结构特点,分析铸件热节凝固难点,气道粘砂难点,结合MAGMA模拟及铸造工艺、焊接热处理工艺解决其技术难点问题。 相似文献