DAVEX roll-joined special profiles

DAVEX profiles are manufactured to a special profile by linear roll-joining of two or more material strips without any additives. A material strip is thereby placed in a groove and a second one is then mechnically toothed through stamping at the contact edge. The toothed edge is then placed in the groove of the first material strip
and pressed tightly in by joining rollers running along the material strip. The belt material is thereby often thicker than the bar material. The strip material can be cut to the desired length from coils with thickness ranging from 3mm to 20mm. This DAVEX procedure allows for permanent mechanical joining of both steel strips. Small caracteristic grooves appear on the side of the inserted material due to the joining process.

The DAVEX technique combines either already ground material strips or completely different materials.

Compared to welded profiles, profiles created using the DAVEX procedure show special caracteristics and must therefore be tested with regards to their adequacy in load-bearing conditions. To this aim, the factory provides the load limit for each particular case of material combination, which may then be used by the structural engineer to evaluate adequacy.

DAVEX technology reduces costs

1| The DAVEX procedure is also employed for profiles that require a large scope of machining operations on one profile components since in this case it is cheaper to execute the machining on the flat material before joining the material strips.

 

 

 

 

2| Here is an example of a reflection-free mirror-polished profile of highly alloyed stainless steel. The individual components have been completely machined and subsequently joined using the DAVEX procedure. With this one-of-a-kind procedure, the surfaces are not damaged ; this allows for cost-effective manufacturing of profiles with the most stringent requirements.

 

 

 

3| This diagram shows a smaller, polished highly alloyed stainless steel profile for the use in the visible part of a luxury yacht.

 

 

 

 

 

4| Complex hole patterns can be obtained on the bar by stamping the individual material strips.

 

 

 

 

 

5| The DAVEX procedure shown above allows for the combination of totally different materials that cannot be welded together normally. The profile is composed of stainless steel belts with a GFK-bar.

 

 

 

 

The restrictions relating to the diverse combinations of this joining technology must be taken into account in individual cases.

In addition to enabling the use of new types of material combinations, in the manufacture of steel sections the roll-forming process offers the advantage that, prior to joining, the individual components can be machined in their two-dimensional state and are therefore generally more cost-effective. Machining often involves grinding and polishing processes that can be carried out considerably more cost-effectively on flat material than on three-dimensional sections. Sections manufactured in this way or polished sections made of stainless steel can be produced to any special dimensions and lengths and delivered both in small quantities as well as in large volumes for large-scale projects.

These sections exhibit the sharp edge characteristics of the input stock. The use of laser-cut or drawn material ensures very precise geometries are produced with small exterior and interior radii of less than 0.5 mm.

Open and closed sections can be produced. The maximum delivery length is limited only by the available input stock. If not otherwise specified, the sections are supplied in standard lengths of 6,000 mm -0/+200 mm and charged at €/kg. The sections can be cut flush (+/-5 mm) or cut exactly to length (-0/+2 mm). Specific lengths are also possible.

For technical reasons, it is necessary to maintain a minimum distance from the edge of the grooved base material when joining the set web. This makes it possible to produce asymetric T-sections and U-sections, but not true angles, with this process. Closed box sections are also possible. Two opposite sides are always displaced towards the centre of the section as an edge clearance is always required in the joining zone.

 

1| Grooving 2| Stamping 3| Adjusting 4| Joining 5| Form fit

DAVEX References

DAVEX technology finds its applications where materials that cannot be combined using conventional technologies must be joined to form a rigid profile. The source of the durable joint lies in the pressure stability of the inserted material. Even fiber-reinforced plastics can transmit greater loads.

A great cost advantage of this technology is the possibility of first grinding of even polishing the material strips that are to be joined together to form a profile.

Furthermore, it is even easier to execute complex operations such as drillings, functional or design millings early on so as to be able to costeffectively produce large and small quantities.


DAVEX-technology, recommendations for the dimensions

Type B -min. B -max. H -min. H -max. Length -max. S -min. S -max. T -min. T -max. Ra Angle
DVL-profile 40 400 40 400 15.000 2 20 4 40 0.5 90°
DVU-profile 40 400 40 400 15.000 2 20 4 40 0.5 90°
DVK-profile 40 400 40 400 15.000 2 20 4 40 0.5 90°
DVH-profile 40 400 40 400 15.000 2 20 4 40 0.5 90°
DVT-profile 40 400 40 400 15.000 2 20 4 40 0.5 90°
DVZ-profile 40 400 40 400 15.000 2 20 4 40 0.5 90°
DVPI-profile 40 400 40 400 15.000 2 20 4 40 0.5 90°

all measurement units in approx mm


Materials and accreditations

General accreditations

Regularly processed qualities:

Construction Steel

> S235 J2

> S275 J2

> S355 J2

Stainless Steel

> 1.4301 / 1.4307

> 1.4541

> 1.4401 / 1.4404

> 1.4571

> 1.4539

> 1.4828

> 1.4841

Duplex

> 1.4162

> 1.4362

> 1.4462

> 1.4410


This is how accreditation works

The DAVEX technology is generally approved by construction authorities. Montanstahl guarantees the respect of specifications provided by the client in the form of a technical drawing with all required geometries, information about materials quality and the the required connection values.


Information Material

   Montanstahl Image Brochure

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