１　引言　　早在１９６９年激光就被用于汽车电子零件电阻的修整和陶瓷基板的划线，这是首次发现激光振荡９年以后的事。七十年代中期，美国进行了两大开发，即由福特汽车公司开发的车体钢板激光焊接和由通用汽车公司开发的动力转向装置齿轮罩的激光淬火。这些开发为以后汽车 1 Introduction As early as 1969, the laser was used to trim the resistance of automotive electronic components and to scribe the ceramic substrate. This was the first time nine years of laser oscillation was discovered. In the mid-1970s, the United States conducted two major developments, the body-plate laser welding developed by Ford Motor Company and the laser quenching of the power steering gear cover developed by General Motors. These are developed for later cars