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直流焊机由于它的使用场合决定了人们非常注意其在焊接过程中的性能,焊机特性中的外特性与动特性都是焊机焊接适应性的因素。直流焊机的焊接适应性虽与外特性有关,但在很大程度上更取决于动特性指标。本文主要分析了焊机动特性与焊接适应性之间的关系,寻找评定直流焊机焊接适应性实用的动特性指标。 相似文献
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《焊接学报》2001,22(3):12-16
熔滴短路过渡的CO2焊,其焊接过程的电信号是随机的,并且是各种电弧物理现象丰富信息的载体.对于随机信号采用统计分析方法,便于把信号化为简缩和容易理解的形式,反映整体焊接过程的情况,并提取出与实际焊接效果相关的特征信息,用明确的图、表表示出来,据此可望对电源的动特性进行客观的评定.因此,本文阐述了电弧焊统计分析方法的原理,进行了CO2电弧焊电源动特性的试验研究,在此基础上,研究利用统计分析提取评定弧焊电源动特性的特征信息的方法,提取了评定动特性的统计特征信息及其特征向量.研究结果表明,当动特性发生变化时,统计特征向量中各特征信息的显著性亦按一定的规律变化,这为根据各统计特征信息的变化评定弧焊电源的动特性奠定了基础. 相似文献
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《机械制造文摘:焊接分册》2010,(3):28-29
逆变CO2气体保护焊机动特性及控制,通过CBT方法开发低热输入低飞溅CO2/MAG交流焊接系统,基于ARM和CPLD的弧焊电源数字化面板,DSP控制的IGBT邀变式GMAW焊接电源主电路设计,基于DSP和FPGA实现三相整流焊机数字控制和触发…… 相似文献
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本文介绍了逆变C2气体保护焊机的电源动特性指标,分析了动特性指标对飞溅的影响.在不同电压、电流参数下进行焊接,测量焊接电压、电流波形,并收集了各种规范下的飞溅,分析了短路电流上升速度di/dt、短路电流峰值,Im、短路到燃弧电源电压恢复速度对飞溅的影响,实验表明短路峰值电流、电压恢复速度对飞溅有一定的影响;随着焊接电流的增大,短路电流上升率的减少,飞溅量显著上升;并指出瞬时短路是造成飞溅的重要原因,并论述通过调节电子电抗器电感可以获得各种规范下所需的电感值,从而使逆变C2气体保护焊机具有良好的电源动特性,以减少C2焊接飞溅. 相似文献
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指出不同的焊接方法应选用不同静外特性的焊接电源,介绍了电弧焊机的选用和使用方法,并对电阻焊机电源特性和焊接回路的基本特点进行了系统的分析。 相似文献
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交流弧焊机是一台特殊的降压变压器,具有陡降的外特性.为了保护外特征陡降及交流电弧的稳定燃烧,在电源内部应该有较大的感抗.获得感抗的方法,一般是靠增加变压器本身的漏磁或在正常漏磁变压器的次级回路中串联电抗器来实现.交流弧焊机主要是通过调节焊机的感抗值来调节焊接电源,其基本变动铁芯或动绕组的位置或调节芯的饱和程度等.交流弧焊机主要有动铁芯式、同体式和动圈式三种. 相似文献
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Pulsed MIG welding is suitable for aluminum alloys welding, because spray transfer and excellent profile can be arrived during whole welding current range, and the energy of droplet can be controlled to overcome losing of alloy elements with lower melting and steam point by controlling pulse current and pulse time. Because of the special physic properties of aluminum alloys, there are different requirements for pulsed MIG welding between starting arc short circuit and drop transfer short circuit, pulse period and base period. In order to satisfy the need of aluminum alloys MIG welding, self-adjusting dynamic characteristics are designed to output different dynamic characteristics in different welding startes. The self-adjusting dynamic characteristics of pulsed MIG welding are achieved through a short circuit controller and a dynamic electronic inductor. The welding machine(AL-MIG 350) with self-adjusting dynamic characteristics has a high rate of successfully starting arc up to 96%, and the short circuit time during transfer is less than 1ms, in the mean time, the arc is stiffness, spatter is low and weld appearance is good. 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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利用温度与变形实时测量系统,对铝合金5A12薄板氩弧焊接动态角变形过程进行了试验研究,探讨通过特征值来描述角变形动态行为.通过对温度及变形动态曲线的分析,提出了焊接动态角变形过程的两个特征值,即下挠最大值点和上翘平衡点.并采用正交试验法,研究不同焊接参数条件下动态角变形曲线的变化规律,构建焊接角变形的动态特征曲线的数学模型.结果表明,动态变形特征曲线的数学表达式能够反映焊接角变形的动态变化趋势,下挠最大值、上翘平衡值及下挠和上翘过程中曲线斜率的变化是描述动态变形曲线变化趋势的关键因素. 相似文献
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The dynamic process of welding angular distortion in the overlaying welding of 5A12 aluminum alloy and BT20 titanium alloy was investigated. Information of dynamic distortion was got via self-made welding dynamic measuring system. Research results show that the characteristics of dynamic distortions at various positions of the plate edge parallel to the weld of 5A12 and BT20 alloy are different. Comparison between 5A12 and BT20 alloy shows that transverse shrinkage and downward longitudinal bending are main factors influencing the dynamic angular distortion processes of 5A12 and BT20 alloy under welding heat input of 0.32 kJ/mm. The angular distortion of 5A12 alloy is completely inversed with welding heat input increasing to 0.4 kJ/mm, and the position of weld center and buckling distortion become the primary factors. 相似文献
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在分析CO_2气体保护焊过程中电弧动特性的基础上,提出了焊接回路时间常数τ和短路电流峰值与焊接电流之比(I_(sd)/I_f),可以作为衡量整流器式CO_2气体保护焊电源动特性的指标。 相似文献
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通过熔池的动态观测可以获得焊接过程的稳定性和连续性等信息.熔池的动态观测目前基本上停留在试验室阶段,焊接现场对熔池进行观测在改进工艺和指导生产等方面更具意义.针对焊接现场焊接电源不能修改,非计算机可控,电流电压波形未知等问题,在焊接现场建立了一套焊接熔池图像动态检测系统.根据焊接现场脉冲GTAW的特点,采用"外同步取像"方式确定了焊接现场取像的关键制约因素--取像时刻;并利用电弧光谱分析建立了减小弧光干扰的复合滤光系统;在适合的取像时刻,CCD摄像系统配合复合滤光系统,在焊接现场检测到了清晰的熔池图像. 相似文献