Abstract
Strange silver white spots appeared in fracture sufrace of tensile test specimen of C.E.S. weld metal and hydrogen charged weld metal.
We studied on this phenomenon s are the results obtained are as follows.
(1) Those silver white spots are micro weld cracking and fish eye.
(2) Micro weld cracking includes small columnar structure and fish eye do not include columnar structure.
(3) Micro weld cracking is similar to so called "Ice flower structure.
(4) Weld cracking in the C.E.S. weldment has been considered as a hot crack, but that is a cold cracking induced by hydrogen.
