These pipes are produced by steel lamina S235 JR which is shaped progressively in order to shape roll and are stacked with the technique of Electric resistance welded in utmost of the lamina which has already the form of pipe without the use of additional adhesive material. Then passes in from a line and takes the desirable form, square or parallelogram and is checked with ultrasounds for by any chance of wrongs in welding.
The hollow section are produced according to model [EN] 10219.
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Table Rectangular Hollow Section