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What’s the advantage of TIG over MIG?
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facing beam fabricators is that base plates must have drilled holes. When a hole
is drilled, it requires cooling oil for the cut. All of that oil that has now stained
the base plate needs to be cleaned free of residue before a paint primer can be
applied. So not only is sanding and grinding needed for prep, but the removal of
all oil.; It’s not just ‘blow and go,’ unfortunately,” Hansen said.
SSPC-SP 10, Near-white
SP 10 is an abrasive blast cleaning standard. “We call that near-white metal,”
SSPC’s Berish said. “By the nature of the definition of the standard, it’s gone
through abrasive blasting, would completely remove all old paint, mill scale, and
rust, leaving no more than 5 percent of staining—discoloration with no volume.”
The surface profile that results depends on the type of abrasive used. “
Abrasives can leave anywhere from a 0.5 profile to a 5- or 6-mm profile,” Berish said.
“You’ll have the best paint adhesion with that finish, because it’s run at a
slower speed through the machine,” Berghouse said.
“SP 10 is the standard for bridge builders, because bridges are exposed to the
elements and support transportation,” Menke added. “For bridge components,
special types of paint are applied in addition to the primers to avoid rust and
so that when the original coat starts to peel, paint can be reapplied in the field
How to Know If Achieved?
How do fabricators know and verify that they have achieved the desired surface condition? A trained and certified inspector evaluates the surface to the
standards in the contract. Visual guides and written industry standards provide
the evaluation criteria, Berish said. “Without proper training, they would not be
qualified to provide the evaluation with a clear understanding of the standards.”
The SSPC is an ANSI-accredited organization, and the consensus standards
have been developed through an ANSI process.
Contributing Editor Kate Bachman can be reached at firstname.lastname@example.org.
Bass Mechanical, 717-367-0890, www.bassmechanical.com
Cortec® Corp., 651-429-1100, www.cortecvci.com
Hansen Steel Services, ;562-692-6900, www.hansensteel.com
Peddinghaus Corp., 815-937-3800, ext. 1145, www.peddinghaus.com
The Society for Protective Coatings, 412-281-2331, ext. 2235,