Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: flame cutting of steel frame

[Subject Prev][Subject Next][Thread Prev][Thread Next]
If your stresses are high in the region of the cut, I would suggest that
you consider grinding all of the face of the cut to remove the metal melted
when the surface was cut.

When steel is cut the metal is melted or heated enough to cause a change in
the grain structure of the metal.  When the remaining material cools you
may find yourself with residual metal that has a different grain structure
and is much harder than the original metal.  These hard regions in the
metal are often the sources of subsequent cracks.  

On one project the metallurgist/welding engineer had the hardness of the
metal measured on the cut surface, and had removed any metal that was too
hard.

Mark Gilligan