Infrared Radiation Diffusion Bonding

It's a process where you heat the part evenly in a vacuum with infrared radiation until the materials weld together. Since no oxygen gets in, there are no oxides and the seam is really clean and tight. It's good for heat-sensitive stuff or when you don't want deformation, because the heat goes in evenly. You just have to make sure the vacuum is really tight and the temperature is right, otherwise the structure gets coarse or you get pores. The radiation has to be cleanly aimed at the joint, then it works.