I' m working on the toughness estimation of the weld metal in the case of a FCAW welded HSLA steel. On the fracture surfaces of Charpy specimens (notch is on the weld metal), the following topography is obtained. The main problem is that i cannot understand is the globular-like clusters are a result of the agglomeration of non-metallic inclusions inside the weld metal or they are corrosion products formed after the fracture??
Additional information:
-EDS analysis is not available
Such globular agglomerations are not present inside the surface of the broken base metal specimens.
-The toughness of the weld metal is lower than the respective of the base metal
Specimen contamination. Either after fracture or on surface of some pre-existing crack.
For better observation use lower kV (not 20, but something like 5). EDS and BSE can certainly help.
This paper may be helpful in your case: Jun Seok Seo, Ka Hee Kim, Hee Jin Kim, Changhee Lee Characteristics of inclusions in rutile-type FCAW weld metal // Weld World (2013) 57:65–72 DOI 10.1007/s40194-012-0009-z
SEM JCM-6000 with EDS is available. If you are interested in collaboration please write to [email protected]
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