There was some welding work happening in the building. Here are some shots captured at various shutter speeds.
I would really be interested if any pro photographers can leave comments on such shots can be captured in a better mode. I have captured them on the “Tv” mode keeping the aperture on auto mode and manually kept increasing/decreasing the shutter speeds.
Kapil's Korner 
Well, a few things I’d recommend that you do with “sparks” are:
# Run a long exposure; so that one captures trails, instead of individual sparks
# Manually focus on the spot that’s the “head” of the spark, and obtain some depth of field macros that way.
# Manual macros, with a zoom lens; help. Try to get a (safe) shot of whatever’s being welded. Color abstracts of that surface are interesting.
# If your camera allows it, lock the color to yellow and let everything else go to monochrome.
Hope this helps!
Sujeet
Sujeet: These sound very interesting to experiment. But I think the welding work is now over, so I will have to find some other interesting subject to try a few of these suggestions.