[strictlypersonl]

My concern is not with the weld, nor the inner mounting system.

On braking, the upper ball joint is pulled forward quite strongly. The a arm is badly triangulated and the front link is jointed at both ends, offering negligible help in stabilizing the ball joint mount. As the upper ball joint moves forward, the front link is torquing the ball joint plate clockwise, with the highest reaction forces taken at the connection of the rear link and the plate. It's a lot of bending moment on a rod that's liable to be weakened by welding.

The system can be "fixed" by having both front and rear links having a centerline intersection as close to the center of the ball joint as possible. Instead of bending forces, you'll have only tension and compression.