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Butt welding pipe fittings usually used widely in kinds of pipes, the production process of carbon steel elbows is to adopt propagating high temperature synthesis by centrifugation, that is to put the elbows in the pipe mould of the centrifuge, add a mixture of iron red and aluminum powder, this mixture is called aluminothermic. When the centrifugal tube mold is rotated at a certain speed, the aluminothermic agent burns immediately