Heat welding seams in resilient sheet flooring or tile is one of the more specialized talents an installer can possess and is a service that a dealer or flooring contractor can offer for a virtually “seamless” floor.  A great deal of skill is involved, so not a lot of installers do heat welding.  The ones who can weld are in demand because health care continues to be a strong market for resilient flooring and that is the number one area where heat welded seams are called for. 

Read more at Floor Covering Installer.