No, because nano tubes are more organized in various patterns and shapes dependent a lot on how they are engineered... Those fuzzy looking "wispy thingy's" probably are some kind of interstitial element(s) as Metarinka mentioned earlier with the possibility of silica strands being the culprit... They can also be imagined as precipitates also...
However, being always skeptical when not enough data is available, I'm not convinced...
I remain only about 50% convinced that they are indeed strands of silica because of what electrode has posted... And I tend to agree with his observation in questioning whether or not those clumps of particles of unknown origin shown, bonded together somehow to make the shape of a sphere which would represent spatter - are metallic... My mind isn't convinced of those clumps and their rounded edges look to be a bunch of recrystallized grains of mild steel shaped as a ball of spatter since the grains are usually columnar & dendritic in shape upon solidification...
Instead of smoothly edged clumps which are not tightly packed or mixed with various components like austentite, pearlite, or either martensite or bainite as one would find in different combinations depending on Time and Temperature @ Transformation from one phase to the other in the grains of low carbon steel welds ... Then again, I'm not 100% convinced of the latter either because there just isn't enough evidence for the elimination of any doubts I have...
I was leaning towards electrode's opinion of this ball of spatter having a possible meta,l core and the outer shell being made of solidified flux turned to slag coating along with some type of strand like material... But Plasma56 posted earlier that the ball originated from solid wire which if true, blows that theory out of the water... I would need to confirm it's origin and then theorize what it might be made of - so I'm back to square one...
Now if there was a written explanation/description available along with this image, or even an EDS graph indicating the chemical composition - my opinion could change somewhat but not yet.
Respectfully,
Henry