逆变弧焊机电弧推力自适应控制系统

在焊接电流确定的条件下,引弧瞬间的焊机输出电压反映了焊接电缆长度、截面积以及连接情况等重要信息。本研究装置是基于MC68HC11单片机控制的逆变焊机电弧推力自适应的控制系统,首先通过对引弧瞬间焊机输出电压的实时检测,实现了电弧推力拐点电压随焊接电流及焊接电缆长度,截面积等改变而自动;然后通过对焊接电弧 实时检测与模糊处理控制焊机的输出电流,从而使MMA手工电弧焊的以推力控制具有很强的自适应能力。     

Stability of pulsed-arc consumable electrode welding

Experiments were carried out to determine the conditions of the stability of the processes of pulsed-arc consumable electrode welding without short-circuiting the arcing gap for rectangular pulses. The experimentally determined conditions of the relative constancy of average or effective current are used to determine the conditions for the stability of the processes of pulsed-arc consumable electrode welding for rectangular pulses in welding in argon and argon-containing mixtures.     

加电弧推力的多功能逆变焊机

通过控制电路的巧妙设计改变弧焊电源外特性（即静特性），给出了多功能焊机手工焊接时加电弧推力的一种方法及其电路原理。     

Metal transfer and arc behaviour of novel consumable and non-consumable electrode indirect arc droplet welding

Abstract

The consumable and non-consumable electrode indirect arc droplet welding is a novel method that applies an indirect arc generated between a consumable electrode and a non-consumable electrode to welding. It was successfully used to overlap join the thin zinc coated steel plate. In the point to point (consumable electrode and non-consumable electrode) configuration, the stable metal transfer was obtained. The globular, projected spray and streaming spray transfer modes were promoted. With the increase in welding power, the metal transfer became faster and more stable. At the same time, the indirect arc became brighter, smaller and more stable. The arc self-regulation guaranteed the stable burning of the indirect arc. The desire stability was observed from the fluctuation of the welding current and the arc voltage waveforms. The side concentrated melting on the root of the droplet produced high pinch effect, which facilitated the detachment of the droplet.     

铸铁冷焊的弧焊电源的研制

介绍了将ZX5-250弧焊电源改制为脉冲电源进行铸铁冷焊的方法。经实验试焊证明，改制后的电源能完全满足铸铁冷焊的要求。     

Integrated model for assessment of electromagnetic force field due to arc welding

Abstract

Computation of the electromagnetic force over a wide range of consumable arc welding parameters is difficult with available models because of the need for experimentally evaluated electrode extension for every individual set of parameters. This becomes more complicated in case of submerged are welding, because the welding arc remains buried beneath flux. This study presents a new approach of integrating mechanistic model of electrode extension with the computational model of electromagnetic force, wherein the apparent electrode extension is obtained by solving the electrode melting rate equation. The proposed approach is demonstrated through a case on submerged arc welding. The effect of current, voltage, electrode diameter, contact tip to workpiece distance and polarity, on the electromagnetic force, is determined and analysed. This investigation shows that detrimental effects of welding electromagnetic force can be restricted without compromising productivity because after initial rapid increase, no considerable change in melting rate is caused by the force under consideration.     

高压环境下电弧电特性及管道焊接工艺的研究

利用自制的高压干法水下焊接模拟试验平台,首次研究了高压空气环境下的GTAW电弧电特性,研究表明:随着环境压力的升高,气体密度增大,电离度降低,弧柱电场强度增加,导致电弧静特性曲线上移.利用多元线性回归方法,建立了高压空气环境下的电弧电压教学模型,并在此基础上进行了高压模拟管道焊接工艺试验.研究表明,随着环境压力的增大,焊接电流减小,Ar流量增大.在0.1,0.3,0.5和0.7 MPa压力下,选用合理的焊接工艺参数,对于X56管线钢,均获得单面焊双面成形的良好效果.     

Effect of exothermic additions on heat generation and Arc process efficiency in Flux-Cored Arc welding

The focus of this research was to determine the effectiveness of exothermically reacting chemical additions to the flux in the Flux-Cored Arc (FCA) welding process. The heat delivery and weldbead morphologies of exothermically assisted FCA welding were experimentally studied with a self-shielded FCA flux formulation. The exothermic additions consisted of stoichiometric mixtures of aluminum, magnesium and aluminum/magnesium (50/50 wt.%) flux with the mineral hematite systematically displacing iron powder. Exothermic flux additions to FCA welding can assist in the generation of heat and improve arc efficiency. The Al/Mg (50/50) electrodes were significantly more effective than aluminium or magnesium flux additions in composite gain value. The weldment dilution increased with exothermic addition. However, overall dilution with exothermic addition was not higher than baseline value except with a 10 wt.% magnesium addition. Weld deposition was most enhanced by Al/Mg (50/50) additions, showing a greater electrode melting efficiency and a larger weldbead than with magnesium-rich and aluminum-rich additions, respectively.     

Twin-wire indirect arc welding by modeling and experiment

Argon-shielded twin-wire indirect arc (TWIA) welding is a method with a high melting rate, high welding efficiency, low welding deformation and low penetration depth of the weld joint. In this paper, the arc behavior of the twin-wire indirect arc (TWIA) for current values of 100 A, 150 A and 200 A and their influence on the welding process were discussed, and the reasons of the previously mentioned advantages of this welding method were analyzed. The plasma temperature was measured to verify the correctness of the simulation. The results indicate that the arc behavior is mainly controlled by the welding current. With the increasing current, the arc parameters in the anode and cathode regions significantly increase, whereas those in the arc column region vary by a smaller degree. The rate of increase of the arc parameters in the entire arc region is smaller than that of the welding current. The isotherm shifts toward the anode side and the shift of the isotherm increases when the welding current increases. The advantaged of TWIA welding was discussed according to the calculated result.     

埋弧自动焊在大口径钢卷管焊接上的应用

为把埋弧焊应用在大口径钢卷管焊接上,分析了焊接工艺设计、焊接工装设计和纵缝、环缝焊接的施工要点,经过实际施工验证了这种方法是成功的,效益是高的。     

一机多枪氩弧自动点焊机的研制

介绍由一台直流焊枪,多把焊枪及氩弧自动焊控制器组成的自动点焊机,该焊机自动进行各把焊枪的引弧－焊接－熄弧以及焊枪间顺序转换,对结构复杂的构件实现多点全位置氩弧占焊,与制作较复杂的转台夹具来转动构件或制造高精度机械手械手焊枪转动实现氩弧点焊相比,其制造成本低,容易实现。     

Mathematical modeling of melting rate in twin-wire welding

The paper treats four mathematical models for calculation of melting rate in arc fusion welding with a wire in coil form. The mathematical models permit calculation of melting rate in direct current welding with single-wire and double-wire electrodes (both polarities).

For single-wire welding the models treated have been improved with regard to the ones published in the literature, for twin-wire welding, these are the first models for calculation of melting rate. The mathematical models have already been tested in practice and the results obtained show that they are very accurate, simple and applicable to practice.     

与弧焊逆变器兼容的高频引弧器的研究

本文介绍一种能与弧焊逆变器良好兼容的新型高频引弧装置。文中分析了该引弧器的原理以及影响引弧高频强度的因素及其调节，试验结果表明，该装置引弧容易，控制调节方便，并实现了高频主电路的无触点切断。     

BX1－160型便携式交流弧焊机的设计与计算

本文介绍了新型ＢＸ１－１６０型便携式交流弧焊机主要技术参数的设计计算方法，该焊机结构合理、紧凑、重量轻，便于携带，且使用灵活，电流能连续调节，是一种新型便携式的交流弧焊机。     

DSP控制的单位功率因数弧焊逆变电源

为了使弧焊逆变电源具有单位功率因数和恒电流输出特性,在研究PWM整流、逆变技术的基础上,提出了采用DSP实现弧焊逆变电源功率因数校正控制和后级逆变桥路控制的策略。前级功率因数校正环节采用基于三相dg旋转坐标下的双闭环PI控制整流技术,后级全桥逆变器采用传统的PWM调制技术。采用Matlad)软件simulink电源模块,对前后级控制电路进行校正和仿真分析,并得到仿真波形。通过对实验样机验证了方案的可行性,输入电流总谐波畸变率能控制在10％以内,功率因数接近1。     

弧焊机器人的应用与发展

简要介绍了弧焊机器人特点和应用现状,着重论述了弧焊机器人应用新技术,并对弧焊机器人的应用技术难点进行了分析以及对弧焊机器人的发展趋势进行了概括。     

弧焊机器人的应用与发展

简要介绍了弧焊机器人特点和应用现状，着重论述了弧焊机器人应用新技术，并对弧焊机器人的应用技术难点进行了分析以及对弧焊机器人的发展趋势进行了概括。     

双丝脉冲MAG焊不同外特性组合下的工艺试验

提出2种比较适合脉冲焊外特性的组合方式,即U-I和I-I.结合双丝焊电源外特性组合方式的理论分析,系统地进行了主从机的3种典型外特性组合的工艺试验,并总结出了双丝焊电源焊接电流、电弧电压分布的一般规律,即主机电流约大于从机电流20～30A,从机电压约高于主机电压2V.通过试验,加深了对双丝焊电弧间热作用、双丝焊工艺特点以及不同外特性组合优缺点的认识.     

TIG and A-TIG welding experimental investigations and comparison with simulation

Abstract

In this part II, the comparison of physical mechanisms between tungsten inert gas (TIG) and active TIG (A-TIG) welding is shown. The plasma was monitored by a high speed camera to present the arc constriction phenomena while passing from TIG to A-TIG. The elemental analysis and the arc temperature measured by optical emission spectroscopy were performed according to the type of welding and the different fluxes in A-TIG welding. The two-dimensional axial symmetric model presented in part I was used to simulate the flow behaviour in the melting pool realised on a stainless steel disc (304L) melted by a stationary heat source and to study the influence of energy density.     

Thermal and force effects of the arc on the weld pool in non-consumable electrode (TIG) welding in inert gas mixtures

The results of investigations of the relationship of the distribution of the arc pressure on the weld pool with the composition of the shielding gas and the characteristics of cathode processes are presented. It is shown that the most favourable pressure curve from the viewpoint of formation of defect-free welded joints is produced using the electrodes forming a diffuse cathode spot and by increasing the helium concentration in the shielding gas in welding with a conical electrode.