Mainly from the aspects of solder joint morphology, tensile load and fracture morphology of the solder joint, the thickness of the 0.07mm metal tantalum foil cross-point laser micro-spot welding process was preliminary studied, and the solder joint was obtained under the optimal process parameters.The structural parts that are well formed and have a certain tensile strength are summarized to draw the following main conclusions.
First , The pulsed laser micro-spot welding was used to successfully connect the cross-shaped tantalum foil weldment with a thickness of 0.07 mm, and the optimal process parameter range was obtained: when the pulse width was 8 ms, the laser pulse power was 0.2 to 0.24 kW.
Second , It was found that the maximum tensile load of the tantalum foil cross solder joints under the optimal process parameter range is 7.77N, which can fully meet the requirements of the collimator installation process.
Third , Laser micro-spot welding tantalum foil cross-spot welding spot fracture mechanism is brittle fracture along the crystal, more obvious elements were found on the surface of the fracture
The phenomenon of segregation is the main reason for brittle crystalline fracture.