超长复杂的光伏支撑架焊接工作站系统设计

超长复杂的光伏支撑架,往往采用人工焊接的方式,产品的质量和效率得不到保证,给企业的发展和自动化转型带来了极大的阻碍。为了提高焊接效率,设计了一种基于激光视觉传感器的机器人焊接工作站。首先,确定了焊接工作站的总体方案;其次,设计了焊接工作站的控制系统,重点设计了焊缝识别控制系统;最后,根据工件焊接特性,确定焊接参数,进行焊接性能测试。测试结果显示,该焊接工作站能够满足光伏支撑架的焊接要求,效率提高69%,可为钢结构类的机器人自动焊接工作站系统设计提供参考。

手弧焊焊接速度测试装置研究

综合分析了手弧焊焊接速度测试中的问题，研制出了光电元器件式焊接速度测试装置，有效地提高了手弧焊焊接速度测试的精度。

基于双处理器的超声波焊接电源设计

文中设计一种基于DSP和ARM9双处理器控制的超声波焊接电源并介绍了双处理超声波焊接电源的硬件组成和软件设计流程。采用DSP控制器对超声波焊接电源外设工作状态以及焊接工艺过程控制。采用ARM9控制器设计了基于Linux系统的人机界面控制系统。采用双口RAM技术实现双处理器的数据共享,确保超声波焊接电源工艺参数、状态信息等数据的快速、实时、可靠传输,以适应用户对超声波焊接电源远程监控和故障诊断等大量数据处理的需要。搭建超声波金属焊接试验平台进行焊接测试,实验结果表明,研制的超声波电源具有良好的人机交互性并能得到较好的焊接效果。

全焊接球阀封闭焊缝质量的控制措施

针对天然气长输管线用全焊接球阀的焊缝质量安全问题,提出了焊缝质量安全的控制措施,重点阐述了焊缝的焊接应力消除和焊接后免热处理的方法评定,通过焊接试样的焊接应力、HIC、SSC、CTOD等检测和评定,验证了封闭焊缝质量控制措施的可行性和稳定性,全面提高了全焊接球阀焊接性能,为解决全焊接球阀生产过程中免热处理技术难题提供理论支撑。

电站压力钢管凑合节焊缝的应力试验

通过对某电站压力钢管与蜗壳凑合节合拢焊缝的焊接全过程进行拘束应力监测和焊接残余应力测试,得出拘束应力和焊接残余应力处于正常水平的结论,由此掌握合拢焊缝的拘束应力情况和锤击法消除焊接应力实际效果,确保合拢焊缝焊接的顺利实施。

Comparison of explosive welding of pure titanium/SUS 304 austenitic stainless steel and pure titanium/SUS 821L1 duplex stainless steel

Pure commercial titanium was welded with two types of stainless steel,namely SUS 304 austenitic stainless steel and SUS 821L1 duplex stainless steel.The wavy interface of SUS 821L1 was smaller than that of SUS 304.The vortex zone was observed from both longitudinal and transverse directions,and its composition was analyzed.The interface of Ti/SUS 821L11 was able to bear 401−431 MPa shear load while that of Ti/SUS 304 could withstand 352−387 MPa.The weldability window was used to analyze experimental phenomenon.Furthermore,the smoothed particle hydrodynamics(SPH)numerical simulation method was used to simulate the wavy interface.The trend of wavelength and amplitude change with strength and the stand-offs was consistent with the experimental results.

海上风机塔架的振动和超声波时效技术应用

介绍了海上6 MW-100 m风力发电机组塔架的主要技术参数,通过振动时效和超声波冲击时效工艺在该项目的实际应用,说明该项技术能在消除塔架焊接残余应力中取得明显的效果,对同类风力发电机组塔架的制造有一定的借鉴意义。

Comparing the reinforcement capacity of welded steel mesh and a thin spray-on liner using large scale laboratory tests

Steel mesh is used as a passive skin confinement medium to supplement the active support provided by rock bolts for roof and rib control in underground coal mines. Thin spray-on liners(TSL) are believed to have the potential to take the place of steel mesh as the skin confinement medium in underground mines.To confirm this belief, large scale laboratory experiments were conducted to compare the behaviour of welded steel mesh and a TSL, when used in conjunction with rock bolts, in reinforcing strata with weak bedding planes and strata prone to guttering, two common rock conditions which exist in coal mines. It was found that while the peak load taken by the simulated rock mass with weak bedding planes acting as the control sample(no skin confinement) was 2494 kN, the corresponding value of the sample with 5 mm thick TSL reinforcement reached 2856 kN. The peak load of the steel mesh reinforced sample was only2321 kN, but this was attributed to the fact that one of the rock bolts broke during the test. The TSL reinforced sample had a similar post-yield behaviour as the steel mesh reinforced one. The results of the large scale guttering test indicated that a TSL is better than steel mesh in restricting rock movement and thus inhibiting the formation of gutters in the roof.

Weld Characteristics and NC Bending Formability of QSTE340 Welded Tube

The mechanical characteristics of the weld joint were investigated by tensile test, microstructure test, and microhardness test. The welded tube NC bending tests were carried out to evaluate the weld on the formability of the QSTE340 welded tube. The results show that the wall thinning degree, cross-sectional deformation and springback angle increase significantly as the weld line is located on the outside of the bend compared with that located on the middle and inside, and the welded tubes produce nearly identical performance as the weld line is located on the middle and inside. The wall thickening degree decreases much as the weld line is located on the inside of the bend. So the welded tube can acquire good bending formability as the weld line is located in the region away from the outside of the bend.

厄瓜多尔CCS水电站配水环管残余应力检测

以厄瓜多尔CCS水电站配水环管现场焊缝热影响区的焊接残余应力检测为例,介绍了焊缝残余应力的检测方法及运用标准,对检测结果进行了分析,为今后类似工程的残余应力检测提供了可借鉴的经验。

Health condition monitoring with multiple physical signals in tensile test for double-material friction welding

The manifold physical signals including micro resistance,infrared thermal signal and acoustic emission signal in the tensile test for double-material friction welding normative samples were monitored and collected dynamically by TH2512 micro resistance measuring apparatus,flir infrared thermal camera and acoustic emission equipment which possesses 18 bit PCI-2 data acquisition board.Applied acoustic emission and thermal infrared NDT(non-destructive testing) means were used to verify the feasibility of using resistance method and to monitor dynamic damage of the samples.The research of the dynamic monitoring system was carried out with multi-information fusion including resistance,infrared and acoustic emission.The results show that the resistance signal,infrared signal and acoustic emission signal collected synchronously in the injury process of samples have a good mapping.Electrical,thermal and acoustic signals can more accurately capture initiation and development of micro-defects in the sample.Using dynamic micro-resistance method to monitor damage is possible.The method of multi-information fusion monitoring damage possesses higher reliability,which makes the establishing of health condition diagnosing and early warning platform with multiple physical information monitoring possible.

3D finite element analysis of the residual stresses in butt-welded plates with modeling of the electrode-movement

In this paper the residual stresses in a butt-welded plate of 2.25Cr 1Mo has been analyzed using a 3D and transient finite element (FE) model.Also the effect of the welding-electrode speed has been studied using death and birth of FEs.For this purpose,a coupled thermo-mechanical FE solution has been used to obtain the temperature distribution and the resulting residual stresses.Also,the variations of the physical properties of the material with temperature have been taken into account.Results show that the residual stresses in the heat affected zone (HAZ) are maximum and change along the weld and also in the plate-thickness.It has been shown that use of the 3D and transient model will lead to more accurate and realistic results which are well compared with the experimental test data.

基于实例与仿真技术的电子线路设计教学改革

根据独立学院人才培养的特点和电子线路设计课程的教学目标,本文提出了基于实例与仿真技术相结合的教学方法,并以电子线路设计模拟电路部分的知识为例,详述实例与仿真技术相结合的教学设计思路,根据理论内容选择和设计实例的方法以及教学方法的具体实施过程。调查结果表明,学生整体上对教学效果非常认可,达到了教学改革的预期目标。