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    • 57. 发明授权
    • Electrical resistance-pressure welding process for welding parts of
workpieces made of aluminum materials and an apparatus and electrode
therefor
    • 用于焊接由铝材料制成的工件的部件的电阻 - 压力焊接工艺及其装置和电极
    • US4591687A
    • 1986-05-27
    • US469033
    • 1983-02-23
    • Werner Urech
    • Werner Urech
    • B23K11/18B23K11/30B23K35/02B23K11/00
    • B23K35/0205B23K11/3009Y10T428/12347
    • Spot- and projection-welding of aluminum sheets has always been connected with difficulties mainly because of the surface layers of aluminum oxide, and even by pickling, these difficulties could be only partly eliminated. The main difficulties have always been insufficient electrode life times, the unsatisfactory quality of the weld and especially the unsolved problem of achieving good quality welding and long electrode-life when using un-pretreated aluminum sheets. The problem has been solved in principle by using electrodes having profiled contact-surfaces, by means of which the layer of oxide is broken during pre-pressing and a direct contact between the electrode and unoxidized material of the workpiece is provided, the contact-resistance of which is lower than the portion of the overall resistance of the point of weld formed by the metal of the aluminum sheets to be welded together. In an appropriate welding machine, the means for switching-on the welding current are controlled in such a manner that the welding current is switched on only after a sufficiently large contact area and therewith a sufficiently low contact-resistance of this contact has been reached.
    • 铝板的点焊和投影焊接一直与困难有关,主要是因为氧化铝的表面层,甚至酸洗,这些困难只能部分消除。 主要的困难一直是电极寿命不足,焊接质量不合格,特别是使用未经预处理的铝片时焊接质量好,电极寿命长的未解决问题。 原理上已经通过使用具有异型接触面的电极来解决该问题,通过该电极,在预压期间氧化层破裂,并且提供了工件的电极和未氧化材料之间的直接接触,接触电阻 其低于由待焊接在一起的铝板的金属形成的焊接点的整体电阻的部分。 在适当的焊接机中,接通焊接电流的装置以如下方式进行控制,使焊接电流只有在足够大的接触面积之后才被接通,从而达到该接点的足够低的接触电阻。