楔形焊接工艺简介.pptVIP

焊接质量分析 莫卓亚 2007.8.20 1 焊接过程出现的问题以及解决方法 1 焊接过程出现的问题以及解决方法 1 焊接过程出现的问题以及解决方法 1 焊接过程出现的问题以及解决方法 1 焊接过程出现的问题以及解决方法 1 焊接过程出现的问题以及解决方法 1 焊接过程出现的问题以及解决方法 1 焊接过程出现的问题以及解决方法 2 Three factors affecting the bonding result Three factors that will affect the bonding result should be considered in the design of the wire bonder ： FAB forming technology Bonding technology Loop technology ( from JauLiang Chen, Member IEEE) 2.1 FAB forming technology The parameters which affect the gold wire ball formation include: 1.Tail length left after second bonder 2.Type and shape of capillaries used 3.Material characteristics of gold wire 4.Supplied voltage, current and time of EFO unit 5.Gap between tail and electrode plate 6.Relative position between capillary and electrode plate 2.1 FAB Modeling for Gold WB for different WD Different EFO settings can achieve the same FAB size for the same wire diameter Fig1.EFO time-FAB charts for 1.0 mil Au at 30mA, 40mA and 50mA EFO currents These results conclude that the different levels of EFO settings deliver the same input energy to produce the same FAB or output energy 2.1 FAB Modeling for Gold WB for different WD EFO输入的能量理想表示为： 对于一个确定的bonding系统，R是确定的， 当EFO放电击穿空气间隙时，可以将R忽略 因此: 理想情况，能量完全传递时，n=2 因为存在能量损失，所以n=1~2 2.1 FAB Modeling for Gold WB for different WD 理想情况下，输入能量=输出能量 输出能量可由FAB size 表示 输入能量可由EFO current and EFO time 表示 在相同的设置和环境下 2.1 FAB Modeling for Gold WB for different WD The energy transfer efficiency charts in Figure show a direct relationship between the FAB size and the EFO input energy for each reference wire diameter. Fig2:Energy Transfer Efficiency charts for: 0.6mil, 0.8mil, 1.0mil, 1.5mil, 2mil, 2.3mil, 2.7mil and 3.2mil Au wire 2.1 FAB Modeling for Gold WB for differ