WilsonLaidlaw......your checks will not reveal cracking WITHIN the weld. To check the surface you could use a dye penetrant kit. This link shows the process. https://youtu.be/xEK-c1pkTUI
I am dubious about dye penetrant testing. I had a failure of a titanium spherical joint on a rear track control arm on my Ralt F2 car, on the first event of the year, after penetrant testing over the winter. This resulted in the car going into Armco at considerable speed and 45º on a hill climb in the Ardennes. From the post breakage metallurgy by Rose joints, it appeared that the crack had propagated from the inside surface of the outer housing of the joint, which dye testing would not have detected. The titanium had not been properly heat treated/stress relieved after forging and the whole track control arm was found to be a counterfeit part, using joints probably made in the far east. Needless to say, I replaced all the other spherical joints on the car afterwards. Three of these, all titanium ones, were also found to be counterfeit. The stainless steel ones were all genuine.
