Well if you want NO sparks an air saw is about all I can think of..
Something like this...
http://www.sears.com/shc/s/p_10153_1...eyword=air+saw
A metal shear wont really work very well, but I suppose you could try..
http://www.sears.com/shc/s/p_10153_1...rd=metal+shear
I use a cut off wheel or a plasma cutter....but those all produce alot of sparks.