USB电连接器激光钎焊工艺

Laser Soldering Process of USB Electrical Connector

通过金相、扫描电镜和拉伸试验研究了USB电子连接器激光钎焊工艺参数对接头连接质量和强度的影响.结果表明,在激光器的离焦量为27.5 mm、电流为120 A的情况下,随着脉宽的增加接头强度先增大后减小,当脉宽范围为1.4~2.0 ms时接头强度满足行业标准,且当脉宽为1.7 ms时接头的最大拉伸力达到29.63 N;在激光器的离焦量为27.5 mm、脉宽为2.0 ms的情况下,随着电流的增加,接头强度先增大后减小,当电流范围为130~150 A时接头强度满足行业标准.最优焊接参数下的金属元器件管脚和芯线被钎料充分润湿,且焊点的钎料飞溅、少锡和连锡缺陷较少.

The effects of laser soldering process parameters on the quality and strength of joints of USB electronic connectors were studied by metallography,scanning electron microscopy and tensile tests.The results show that when the defocusing amount of the laser is 27.5 mm and the current is 120 A,the joint strength increases and then decreases with the increase of the pulse width.The joint strength meets the industry standard if the pulse width ranges from 1.4 to 2.0 ms.And the maximum tensile force of the joint reaches the max of 29.63 N while the pulse width is 1.7 ms.When the defocus of the laser is 27.5 mm and the pulse width is 2.0 ms,the joint strength increases with the increase of current.The joint strength meets the industry standard if the current range is set at 130~150 A.The pin and wires under the optimal welding parameters are fully bounded by solder,and the joint has nearly no defects,such as spatters and bridging defects.