KTVU KTVU 6 OClock News June 15, 2013
detector or the probes that can find the tiniest of imperfections. >> as you run the probe down the weld very slowly, you're looking for something to peak above that green line. and when it does, then you know that you have something to look at, which may or may not be significant. >> reporter: nonetheless, each and every imperfection is mapped for additional inspection and investigation. the bridge building code says small imperfections do not need repairing. >> the code gives you a threshold. it gives you a limitation of what is acceptable and what is rejectible. >> so not even the...