Electrical assemblies for downhole use
Methods, systems, devices, and products for manufacturing an electrical assembly, such as a completed downhole circuit board, for use in well logging. Methods include attaching an electrical component to a printed circuit board by mechanically fastening the electrical component to the printed circuit board. Methods may include using a laser to attach a plurality of legs to contact surfaces. Methods may include applying light from the laser to a material of the printed circuit board to produce heat, including mitigating reflection of the light from the material. Methods include forming a connection between a first electrical component of the electrical assembly and a second electrical component of the electrical assembly by causing heating of an additive manufacturing material by applying light from a laser. The connection may be at least one of: i) an electrical connection; ii) a structural connection; iii) an electrical insulation.
1. A method for manufacturing a downhole circuit board for use in well logging in a hot environment, the method comprising:
forming an electrical assembly including attaching an electrical component to a printed circuit board by applying light from a laser to a light absorbent graphene-composite solder to produce heat sufficient to melt the graphene-composite solder.
2. The method of claim 1 wherein the solder comprises a metal.
3. The method of claim 1 wherein the light has a wavelength of less than 450 nanometers.
4. The method of claim 1 wherein the light is produced at a first wavelength, the method further comprising applying light from a second laser to a flux material of the circuit board, wherein the light from the second laser has a second wavelength different than the first wavelength, and controlling the laser separately from the second laser.
5. The method of claim 1 wherein the electrical assembly is configured for use in a downhole well logging tool.