With the demand of high-quality and aesthetical products in the domain of medical microbiology, it’s more and more important to join micro weld. Due to traditional joining methods’ difficulty in meeting the demands, laser transmission micro-joining is of great significance. The materials used to laser transmission micro-joining based on the mask are PET, and the experiments are conducted on diode laser. The weld geometry with different gap widths on the mask is demonstrated at the same process parameters. In addition, the causes of forming different morphologies are analyzed. The formation mechanism of weld is analyzed as well. Moreover, process parameters’ effects on joint strength and joint width are deeply explored when gap width on the mask is 0.3mm. The results show that100 um micro weld joint is realized. At the same time, the range of process parameters is determined.

In this paper,the laser transmission joint strength is studied with semiconductor laser based on the surface pitting of 304 stainless steel and PA66.Unevenly distributed pits are formed on the surface of 304 stainless steel with 10% ferric chloride solution for two hours, which have certain morphology, depth and size. Different laser power, welding speed and welding pressure are used in laser transmission joining 304 stainless steel and PA66,which 304 stainless steel contains pitting corrosion before and after. The tensile strength test of joined samples shows that: the joint strength of pitted 304 stainless steel and PA66 with laser transmission joining is improved at least 135%; the riveted structure formed at the joining interface improve the joint strength.

In order to improve the machining accuracy of machine tools, it is important to obtain the geometric profile information of the parts after clamping, in order to plan the machining path again. Line laser measurement has the advantages of non-contact and large single measurement area, so it has higher measurement efficiency than traditional contact measurement. However, due to the influence of measurement environment, laser measuring angle, tested workpiece surface quality and other factors, the measurement errors of each point on the laser measuring line are different, so it is important to compensate the error and set the working parameters of the in-situ laser sensor measurement system. In this study, the influence of the line laser measuring angle factors is researched. The physical model of the laser light path is deduced based on the laser triangulation principle. Then the measuring angle compensation model can be expressed quantitatively. At the same time, the algorithm to obtain the measurement angle based on free-form surface measurement results is used, as it is an important parameter of compensation model in practical application. On this basis, a set of line laser sensor in-situ measurement process is put forward. The influence of the working environment factors on the stability of line laser in-situ measurement data is explored through experiments, such as tested workpiece surface material and ambient light intensity. The process conforms to the actual engineering requirement and provides experience reference.

This article uses semiconductor laser for mask assisted laser transmission micro joining PET and PET with clear weld absorbents, the mask slit width is 0.3mm, using CCD to plan experimental design. The mathematical model of joining process parameters with joint strength and joint width was established using response surface methodology. Experimental verification was also done. The actual joint width was compared to mask slit width and the process parameters were optimized. The results show that the mathematical model can response the relationship between process parameters and joining quality, the mask can effectively control the joint width, reasonable process parameters can obtain high-precision, high-intensity joining quality.