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排序方式: 共有212条查询结果,搜索用时 15 毫秒
1.
数字信号处理器DSP主控GMAW焊接 总被引:2,自引:2,他引:2
阐述了焊接过程信息数字处理控制思想,实际研究了数字信号处理器9DSP)在CO2气体保护焊机中的应用,将数字信号处理器(DSP)在送丝系统的柔性化调节,引弧和收弧模式,焊接参数的一元化自调节等方面的应用作了研究和试验,通过研究和样机试验,建立了一套焊接电源的数字化,信息化,柔性化控制平台,并探讨了数字信号处理器(DSP)在CO2焊接领域中的应用优点和前景,并提出了DSP主控GMAW焊接电源全系统框图,试验证明该系统工作稳定可靠,较好地满足了工艺性能,实现了焊机控制的数字化。 相似文献
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A predictive functional controller based on ARMarkov model structure has been designed to control welding current and arc voltage in a GMAW process. The closed loop system performance is investigated through computer simulations and is compared by those achieved from implementing two commonly used controllers i.e. PI and feedback linearization based PID. The local stability of the closed loop system is analyzed in the presence of uncertainties in the linearized model of the process as well as the control parameters. Finally it is shown that the proposed controller performs like a PI controller along with a pre-filter compensator. 相似文献
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Krishna P. Yagati Ravi N. Bathe Koteswararao V. Rajulapati K. Bhanu Sankara Rao G. Padmanabham 《Journal of Materials Processing Technology》2014,214(12):2949-2959
In this work, joining of aluminium alloy AA6061-T6 to Interstitial Free steel using pulsed gas metal arc welding process has been attempted. The effect of different surface conditions of steel (viz, galvanized, galvanealed and uncoated) and gap between the sheets on braze joint formation have been investigated. Galvanized steel surface showed good bead width, joint formation and lap shear strength compared to the other two combinations. Interface gap has not affected the wetting behaviour significantly but presence of a gap of 300 μm or so helped in escape of zinc vapour during the process there by avoiding formation of any crevice or macroporosity in the joint. Features and properties of the joint are characterized by metallography, fractography, energy dispersive spectroscopy (EDS) and lap shear tests. Load carrying capacity of Al-Galvanized steel was highest (222 N/mm of seam length) compared to other combinations, aided by better wetting due to presence of Zn on the surface and minimum porosity due to interfacial gap provided during brazing. 相似文献
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Investigate Weld Quality of Gas Metal Arc Welding Process Through Online Monitoring of
Input Parameters 下载免费PDF全文
Gas metal arc welding (GMAW) is also referred as the metal inert gas (MIG) welding which is a process of welding done by the formation of an electric arc between the consumable wire electrode and the workpiece. Through the welding process, a continuous flow of inert gas is supplied, and it avoids the weld being subjected to react with at-mospheric air. The process can be automatic or semi-automatic where the main input parameters like current and the voltage can be direct and constant, respectively. Not only the current and voltage the welding quality depends on some more input parameters such as arc gap, velocity, and temperature. In this paper, we explain about a setup which is capable of real-time monitoring of input parameters mentioned above and selecting the best MIG welding parame-ters for the mild steel. The setup is composed of several sensors and microcontrollers for the collection and the measurement of the input parameters. The samples were categorized according to the federate and the voltage ad-justment of the selected welding machine. Then the final objective was to identify the samples of the weld with dif-ferent parameter changes which are monitored through the system. For the analysis, the samples were subjected to tensile and hardness tests, and microstructure tests to find the dependence of the input parameters which effect for the weld quality. Finally, the experimental results verified the effectiveness of the system for the selection of the quality weld. 相似文献
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A scientific application oriented classification for metal transfer modes in GMA welding 总被引:1,自引:0,他引:1
Américo Scotti Vladimir PonomarevWilliam Lucas 《Journal of Materials Processing Technology》2012,212(6):1406-1413
In this work, metal transfer in solid wire GMA welding was studied. Several experiments with different combinations of gas-wire-parameters were carried out to observe metal transfer and to characterize the various transfer modes. A laser shadograph system with synchronized electrical signals and high speed filming were used. New modes were observed and their particular characteristics described for completeness. A classification for metal transfer, oriented to scientific personnel (researchers, scholars and students), is proposed, in which the modes are independent of the type of shielding gas or welding power source. 相似文献