Closed or Welded Steel Profiles:

Mother Tube: To ensure the least possible tooling for your customized steel welded section it is important to try as far as possible to adhere to the circumference off a fast moving or standard round steel tube.

Tubecon uses the Electric Resistance Welding Process (ERW) which implies that a steel strip is formed incrementally, through a progressive set of rolls, along its longitudinal axis to produce a round hollow section.

The ends of the slit strip is heated with high frequency welding, thereafter being forced together by weld rolls to create a continuous weld over the length of the tube. After the structural hollow section has been welded the seam is cooled before moving through a set of sizing and shaping rolls. The sizing rolls are used to incrementally press the round tube into the desired shape. Most common shapes are rectangular and square steel tubes. The round tube, before going through the sizing rolls, is referred to as the mother tube.

Each cold formed profile steel tube, no matter what the dimensions, has to be formed from a round mother tube. If the mother tube is a standard it would imply that we do have the forming rolls and the tooling cost can be kept down to only the last couple of passes to form your desired structural hollow section.

Radii: As a rule of thumb the radii should not be less than the material thickness that the steel tube has to be rolled from. Though it is not impossible to achieve small radii it will also lead to breakage if pressure is applied to the tube.

Tolerances: Tight tolerances on your customized welded sections may have an increased price. If a customized profile tube is rolled for the first time, tighter tolerances will be difficult to achieve and wider tolerances are therefore preferable.