Microlaser welding

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Hi guys,My name is Rogelio H. Aguirre, a grad student from the University of Waterloo working on MEMS sensors. Currently, I am working with micro laser welding suppliers to fabricate the packaging of a pressure and a temperature sensor. I have some experience on weldings, but not in micro laser one. I am welding a TO Header Substrate made of KOVAR with a Steel case. The device should resist a high pressure of 600 psi; however ,I have some leak issues on the assembly at 300 psi approx. I am not sure if the leak is on the welding line, for me, looks like is in the center of the device. To check this, I check the sample using a microscope with a MPlan APO 20 lens, here is where I need your expertise guys. I am attaching a file with 4 pictures, two are from the microscope, do the images attached shows a fracture on the welding line? According to my knowledge is not a crack, but I want to check with you guys.Thanks a lotRogelio Attached ImagesWelding forum3.pdf (110.7 KB, 126 views)