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    • 45. 发明授权
    • Method and apparatus of projection welding
    • 投影焊接方法和装置
    • US6054668A
    • 2000-04-25
    • US895526
    • 1997-07-17
    • Robert G. Van OtterenSamuel E. LewisDarin M. Gilbert
    • Robert G. Van OtterenSamuel E. LewisDarin M. Gilbert
    • B23K11/14B23K11/18B23K11/24
    • B23K11/185B23K11/14B23K11/241B23K2203/10
    • A process and apparatus for projection welding of overlapping nonferrous sheets, particularly thin aluminum sheets. One of the sheets is provided with a projection therein, and the sheets are positioned so that the tip of the projection contacts a surface of the other sheet. The sheets are not subjected to surface pretreatment to remove the surface oxides therefrom. A projection welding head assembly is positioned with the electrode thereof engaged with one of the sheets, and the other sheet is positioned against a stationary backup or electrode. The electrode of the welding head imposes, in rapid time succession, a series of welding pulses to the overlapping contacting sheets. The series of welding pulses includes two and preferably three pulses which progressively step up in amperage to provide for precise control of the heating of the projection and the associated contact area on the other sheet to cause heating to the plastic state, and then forging (i.e. collapsing) of the projection with subsequent and progressive creation of the desired weld nugget. The series of weld pulses also preferably includes, at the end of the series, one or two pulses which progressively step down in current magnitude to permit greater control over the plasticity of the projection and the forging together of the overlapping sheets to create the desired weld bead.
    • 用于重叠有色金属片,特别是薄铝片的投影焊接的方法和装置。 其中一个片材在其中设置有突起,并且片材被定位成使得突起的尖端接触另一片材的表面。 片材不经过表面预处理从其中除去表面氧化物。 定位投影焊接头组件,其电极与其中一个片材接合,另一个片材抵靠固定的支撑或电极定位。 焊接头的电极以快速连续的方式施加一系列对重叠接触片的焊接脉冲。 一系列焊接脉冲包括两个并且优选三个脉冲,其以安培数逐步升高以提供精确控制突起的加热和另一个片材上的相关联的接触区域,从而导致加热到塑性状态,然后锻造(即 崩溃)投影,随后逐渐创建所需的焊点。 该系列焊接脉冲还优选地包括在该系列的末端的一个或两个脉冲,其以当前幅度逐渐降低,以允许更大程度上控制突起的可塑性和将重叠片材锻造在一起以产生所需的焊缝 珠子。