CHENG Xiaolei, TANG Wenmin, WANG Xuanguo.Research on Laser Welding Process and Microstructure of H62 Brass and T2 Copper[J].Electric Welding Machine, 2023, 53(7): 52-59. DOI： 10.7512/j.issn.1001-2303.2023.07.08.
Research on Laser Welding Process and Microstructure of H62 Brass and T2 Copper
It is often necessary to weld brass and copper in aerospace, automobile, refrigeration equipment and other fields, because the dissimilar metal composite structure formed by the two has the mechanical properties of brass and the thermal conductivity of copper. In this paper, the laser welding of H62 brass and T2 copper plate was studied by fiber laser. The influence of laser power, welding speed and other main process parameters on the forming properties and mechanical properties of the weld was studied, and the welded joint with good appearance was obtained. When the heat input was greater than 105 J/mm, the penetration depth increased greatly , and the welding mode changed from laser thermal conductivity welding to laser keyhole penetration welding. When the laser power was 1800 W and the welding speed was 13 mm/s, the maximum depth to width ratio was 2.51.The distribution and evolution of the composition and structure of welded joints and interfaces were analyzed, and the relationship between the microstructure and mechanical properties was explored. It is found that the flow of molten pool is mainly annular, forming the component distribution of zinc content in the weld center is higher than that in the weld edge. It was suggested that the non-uniformity of the composition caused by molten pool flow and component segregation was the main reason for the non-uniformity of the joint properties. The hardness test at the weld center showed that there was a large hardness gradient near the interface of the two materials, and higher heat input could promote the mixing of two materials and reduce the difference of mechanical properties of two materials at the interface.
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