I have been welding for about 60 years and have never seen a chipping 
hammer with a flat or diamond cut face as you see here and the point is 
too thick as well. In my opinion that thing would be useless for a 
welder. A chipping hammer require a chisel edge and sharp point As a 
shrinking hammer the face is too small and the checkering too course you 
would quickly destroy the sheet metal with that thing. I also have 60 
years experience with that work as well. It is not for a welder and not 
for body work. I cannot guess what it might really be for.

Nick