Abstract
Continuous Yb:YAG laser keyhole welding of the pure copper plate to steel 316L sheet is performed for different laser parameters. The laser‐generated welding keyhole and weld melted zone are observed by a high‐speed camera. The image is treated by MATLAB and simple code is built to calculate the keyhole and melted zone area. This treatment is validated by the actual welding measurements, and the accuracy of the measurements is tested by the confidence interval law. The images obtained of keyhole and melt zone area in dissimilar laser welding are treated and analyzed to study the effect of changing the laser parameters.
Highlights
High-quality dissimilar welding has many applications in power generation, and in the chemical, petrochemical, nuclear, and electronics industries for the purposes of tailoring component properties or weight reduction
To find a 95% confidence interval for the mean melted zone length based on the experimental measurements by CCD camera for M.W, M.L, and M.A, the melt pool width, melt pool length, and melt pool area, respectively, as illustrated in Figure 9, first the images for melt pool parameters obtained by camera are treated by using our MATLAB code for all the 18 samples. e same parameters are calculated by Binocular microscope. e ratio R is obtained as for all the 18 samples
E keyhole length, width, and area for different shift distances from the butt joint are reported in Figure 17. is figure shows that the minimum keyhole area occurred at zero shift distance. e shift between the beam axis and the steel/copper interface line shows that the minimum keyhole shape parameters occurred at zero shift distance, the change of shift laser by 100 μm to 500 μm in steel and −100 μm and −200 μm in copper
Summary
High-quality dissimilar welding has many applications in power generation, and in the chemical, petrochemical, nuclear, and electronics industries for the purposes of tailoring component properties or weight reduction. Ere are many applications for the dissimilar copper/ stainless steel welding like the chemical industries, power generation, electric, electronic, and cryogenics. It is very useful in the case of resulting hybrid products which merge the excellent electric and thermal conductivity of copper with essential weight and cost saving [4]. E first difficulty is the large differences of physical properties between the stainless steel and copper like melting point, thermal conductivity, and thermal expansivity. The laser beam welding method is used to avoid these problems [5]
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