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chaikwa,
http://www.tpub.com/steelworker1/5.htm
Here is a link that was posted on the forum a while back by flashburner1.
It shows the different types of sparks you would expect for different types of materials. Also try the search function for "sparks". There were several discussions about this subject.
Check out the link and let me know what you think about your material.
After you have an idea about which material you have then someone could offer a filler and a process of welding for you.
Happy Grinding :)
John Wright