Lack of Fusion after galvanization
Lack of Fusion after galvanization
(OP)
Hello All;
we have noticed many lack fusion welding defects on caisson shoes after galvanization (on white metal). These defects were not detected and UT inspection was passed when these shoes were tested on black metal (before galvanizing). What type galvanization parameters could have caused these defects?
Thanks in advance
Demsha
we have noticed many lack fusion welding defects on caisson shoes after galvanization (on white metal). These defects were not detected and UT inspection was passed when these shoes were tested on black metal (before galvanizing). What type galvanization parameters could have caused these defects?
Thanks in advance
Demsha





RE: Lack of Fusion after galvanization
RE: Lack of Fusion after galvanization
RE: Lack of Fusion after galvanization
Before the member is HDG, it is subjected to a hot pickling operation that can introduce diffusible hydrogen into the area welded.
Best regards - Al
RE: Lack of Fusion after galvanization
Your post heading "LOF after galvanisation" is erroneous if NDT (UT and MPI) was suitable prior to galvanisation.
If items were proven to be defect-free prior to galvanisation then I suggest that metengr and gtaw are likely correct and these are not LOF defects.
Of course there is always the possibility that NDT was not done suitably in which case the caisson shoes may have LOF defects.