共查询到20条相似文献,搜索用时 0 毫秒
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It is shown that a mushroom-shaped waveguide is most suitable for the contour ultrasonic welding of components made of ABS plastics. The optimum shape of the working tip of the contour waveguide resulting in securing of the welded components in relation to the axis of the waveguide on their external contour is determined. 相似文献
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S.S. Volkov 《Welding International》2013,27(4):329-332
The kinetic mechanism of the formation of welded joints with ‘preferential penetration’ and ‘preferential melting’ in ultrasonic welding of plastics is described. It is shown that the preparation of weld edges in ultrasonic welding of rigid plastics increases the welding speed. 相似文献
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摩擦焊作为一种先进的固相连接方法,因其优异的焊接性能引起了人们的广泛关注,近年来航空航天等高新技术与装备的发展促进了这种焊接方法的不断进步。针对近年来国内外超声无损检测技术在摩擦焊领域中的研究应用作了详细分析阐述,并对未来摩擦焊领域中无损检测方法的应用进行了展望。 相似文献
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采用多场耦合模型对超声波塑料焊接过程中的摩擦热和粘弹热进行了数值计算,并分析了超声振幅对焊接区温度场的影响. 基于计算结果,提出了超声波焊接过程存在临界振幅,当超声振幅低于该临界振幅时,不管焊接时间多长,都不能形成熔融焊接区. 制备了相应的试件并搭建测温系统对焊接过程进行测温试验,试验结果与数值计算结果具有较高一致性,进一步对临界振幅附近的临界温度场进行了分析和探讨. 研究临界温度场,有助于解决超声波塑料焊接过程中温度场难以控制的难题,同时为超声波塑料器件非熔融连接方法奠定基础. 相似文献
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The arc characteristic of ultrasonic assisted TIG welding 总被引:1,自引:0,他引:1
Many applications of ultrasonic-assisted methods were used during metal solidification, but they could not be introduced into weld pool. In this paper, a way of ultrasonic assisted TIG welding is introduced. By directly imposed ultrasonic vibration on welding arc, the vibration interacts with arc plasma and passes to the weld pool. Measurement results show that arc pressure is significantly increased with the ultrasonic vibration and the arc pressure distribution models are changed. Bead-on-plate welding tests on SUS304 confirm that this technology can influence the style of metal melting and increase weld penetration depth. 相似文献
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铜/铜超声波焊接的相对运动及断面微观演变 总被引:1,自引:0,他引:1
采用激光位移传感器对铜/铜超声波焊接过程中的工具头、上铜板及下铜板的振动进行实时测量.依据各部分的相对运动及断面的微观演变对焊接过程进行了分析.结果表明,焊接过程中,焊头振幅变化不大,上铜板振幅先增大后减小再增大,下铜板振幅逐渐增大.上铜板振幅增大阶段,上/下铜板的相对运动使界面产生大量摩擦热,界面形成局部微连接.上铜板振幅减小阶段,焊头与上铜板的相对运动显著增大,促使铜板发生剧烈的塑性变形,焊接界面连接面积迅速增加.最后阶段,上下铜板呈等振幅运动,焊接接头断面出现大量韧窝. 相似文献
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S. S. Volkov 《Welding International》2016,30(7):563-568
The types of weld edges are classified in dependence on the requirements on completed products. The method of ultrasonic welding of circular components made of polycarbonate using the V-shaped edge preparation with the formation of a strong hermetic-welded joint around the entire contour is described. 相似文献
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进行了1 mm厚铝/铜异种金属超声波焊接试验研究,分析了不同焊接能量输入对接头形貌、接合区塑性变形、原子扩散的影响.结果表明,工件在高频振动作用下,连接界面间会发生漩涡状塑性变形,形成局部机械自锁,有助于实现超声波接头的有效连接.焊接能量较小时,结合区域塑性变形量小,局部区域无法形成连接;焊接能量过大时,接合区域会出现空穴.SEM和EDS分析表明,能量过高时(2000 J),接触界面区域会形成薄金属间化合物层,其主要成分为Al4Cu9. 相似文献
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Finite element method was adopted to investigate the temperature profile during ultrasonic welding of PEEK (polyetheretherketone ). The comparison of temperature fields was made among the triangular, semicircular and rectangular energy directors. The results show that the highest temperature appears on the sample surfaces in the welding interface. For triangular and semicircular energy directors, the gradient of their temperature fields become larger with welding amplitude increasing, and the temperature decreases along the normal line of surface. The melting point can be rapidly reached before large scale plastic deformation occurs as welding amplitude exceeds 25 μm for triangular energy and 35 μm for semicircular energy director. But for the rectangular energy director, its temperature field is dispersed even under 35μm welding amplitude. 相似文献
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电阻点焊在汽车工业是一种最常用的焊接方式。电阻点焊焊接过程短暂而复杂,焊接过程中熔核的形成不可见,容易出现各种不同类型的焊接缺陷。因此,对点焊接头进行监测和检测是非常必要的。点焊无损检测中最重要的手段是超声波检测。首先对汽车车身点焊的质量检测与监测手段进行综述,然后着重论述点焊超声波检测技术、点焊超声波检测系统的分类与产品现状、点焊超声波检测的信号处理方法、成像技术等关键问题,最后总结当前面临的主要难题,并预测未来的发展趋势。 相似文献
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A technology of ultrasound seam welding of polyethylene terephthalate films has been developed and ultrasound welding equipment and waveguides with spherical working ends constructed. The amplitude–frequency characteristics of acoustic systems are analysed. The dependence of the strength of welded joints on frequency, welding pressure, welding speed and the amplitude of ultrasound oscillations is determined. 相似文献
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A measurement system for high power electrical variables with ultrasonic frequency was established. It can measure the effective values of the voltage and the current, the active power, the phase difference of voltage and current, the frequency of the transducer during ultrasonic welding and cutting. In sampling circuits of the system, the measured current is sensed by using a no-capacitance and no-inductance precision resistor and is treated with a difference amplifier, the measured voltage is processed by using a proportional amplifier. For achieving good amplitude-frequency characteristics and rapid measurement of high frequency signals, the resistors, capacitors and amplifiers used in the system are rationally selected. Calibrating experiments show that relative errors are less than 1% for voltage and current effective values and less than 2.5% for active power, and absolute errors are ±1 Hz for frequency and ±1.7°for phase difference of voltage and current in the range of 17~23 kHz. 相似文献