Experimental analysis of heat conditions of the laser braze welding process of copper foil absorber tube for solar collector elements

In the case of laser braze welding, the heating technology and temperature distribution in the joint have a significant impact on the joint quality of solar collector elements, especially for joints of copper foil as thin as 0.2mm and with very low heat capacity with copper tube with a diameter of 8.0mm and a thickness of 0.5mm, thus being an element of much larger heat capacity. Electrolytic copper has a high thermal conductivity in the range of 400W/mK, which further impedes the heating