A Study of the Improvement of the Sensitivity and the Reliability of the Arc Sensor in GMA Welding. (1st Report). Modelling of the Arc Sensor for DC MIG/MAG Welding in Open Arc Mode.
A Study of the Improvement of the Sensitivity and the Reliability of the Arc Sensor in GMA Welding. (1st Report). Modelling of the Arc Sensor for DC MIG/MAG Welding in Open Arc Mode.
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提高GMA焊接电弧传感器灵敏度和可靠性的研究。
DOI：
10.2207/qjjws.14.99
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
W. Mao
中科院分区：
文献类型：
--
作者：
M. Ushio;W. Mao
建立了一个非线性模型来描述输出之间的关系（焊接电流和电压）和输入（焊炬高度）的过弧传感器（简称为电弧传感器），其由以下五个等式表示：Ut=uao+（Ra+Re）I+（Eai+aiI）（Lt-Le）LwdI/dt+（Ks+Rc）I+Ut=UsdLe/dt=Vf-AI/（1-BJe）Je= Uttt-Δ tI 2（τ）dτRe= Uttle or r（Jz）dZ模型中的所有参数值都是在低碳钢和不锈钢焊丝焊接的情况下确定的（1.2mm直径）和100%Ar的保护气体。基于该模型的仿真结果与实验结果吻合较好，同时，在任意变量在给定工作点附近变化较小的假设下，由非线性模型导出了电弧传感器的线性化模型，其形式如下：dUt/dt-Kw 1dI/dt-Kw 2dLe/dt= Kw 3dLT/dtLwd 2 I/dt 2 + Kw 4dI/dt+ Kw 2dLE/dt=-Kw 3dI/dtd 2Le/dt 2 + Ke 1dLe/dt=-Ke 2dI/dt当然，一些其它特征，例如，研究了GMA焊接过程中焊丝熔化的动态特性。
A nonlinear model has been developed to describe the relationships between the output (welding current and voltage) and the input (torch height) of through-the-arc sensor (simply called arc sensor) in DC MIG/MAG welding in open arc mode, and it is expressed by following five equations:Ut=uao+(Ra+Re)I+(Eai+aiI)(Lt-Le)LwdI/dt+(Ks+Rc)I+Ut=UsdLe/dt=Vf-AI/(1-BJe)Je=∫t t-ΔtI2(τ)dτRe=∫Le o r(Jz)dZAll values of the parameters in the model were identified in the case of welding with both mild and stainless steel wires (1.2 mm diameter) and the shielding gas of 100%Ar. The simulated results based on the model have shown quite good agreements with the experimental.On ther other hand, a linearized model of the arc sensor has also been drived from the nonlinear model under the hypothesis of any variable only showing a smaller variation around a given operating point, and it's form is shown as follows:dUt/dt-Kw1dI/dt-Kw2dLe/dt=Kw3dLT/dtLwd2I/dt2+Kw4dI/dt+Kw2dLE/dt=-Kw3dI/dtd2Le/dt2+Ke1dLe/dt=-Ke2dI/dtOf course, some other features, for instance, the dynamic characteristics of electrode wire melting in GMA welding have also been made clear by the present work.