News

Submerged Arc Welding (SAW)

SAW welding - Submerged Arc Welding

Various names for the same process.

This is an automated arc welding process, which involves feeding a wire, just like with an electrode, but in which the coating of the electrode is replaced by a protective powder. The machine applies a blanket of granular fusible material on the work just before the welding process, and sucks it up again once it is completed.

It is a very powerful welding process, also allowing high welding speeds. It is especially suitable for longitudinal and circumferential seams, especially when multiple passes are necessary.

23 January 2020

Welding job of thick sheets - up to 100 and 200 mm

While most of the welds laid in our workshop are between 6 to 10 mm and 20 to 30 mm, some welds are well above that. We can also weld plate thicknesses from 150 to as much as 200 mm. If a continuous weld is required, it goes without saying that a great many welding layers are necessary.

We can never afford mistakes, so you understand that the quality of the welds is all the more important. Imagine that RX testing performed on such a welded joint reveals welding defects deep inside...

28 December 2019

Submerged Arc Welding (SAW)

SAW welding - Submerged Arc Welding

Various names for the same process.

This is an automated arc welding process, which involves feeding a wire, just like with an electrode, but in which the coating of the electrode is replaced by a protective powder. The machine applies a blanket of granular fusible material on the work just before the welding process, and sucks it up again once it is completed.

It is a very powerful welding process, also allowing high welding speeds. It is especially suitable for longitudinal and circumferential seams, especially when multiple passes are necessary.

04 December 2019

New! Plasma keyhole welding derrick

Our new plasma keyhole welding derrick has been installed and initial tests look promising!

The welding derrick uses the same technology as our existing plasma keyhole welding installation, but has an automatic clamping system with integrated backing and cooling so that a flat or centred plate no longer needs to be spot welded, and just needs to be clamped together before welding.

Flat sheets thus remain straight and flat during welding; the machine produces a perfect continuous weld (for stainless steel, within a range of 2 to 10 mm) in one single pass and works at a very high speed. 

07 October 2019

Aluminium structure

In the autumn Deprest contributed to an artistic project, which consisted in an aluminium structure for a major show.

The structure involved one large central ring with a diameter of 8 metres and 4 hinged metal legs.

Watch the video to get a good feel of what went on in our workshop. It also demonstrates how the articulations of the structure were tested.

30 June 2019

Another pressure vessel has left the building

It’s not suprising to see a pressure vessel leaving Deprest. We at Deprest are specialized in pressure vessel. Each week some vessels – large or small – leave the site. Our pressure vessels are made in steel, stainless steel and special alloys. We elaborate and follow projects from A to Z, inclusive technical calculations, design, testing, complete execution, and the testing and follow-up of the necessary inspections.

05 October 2018

Plate filters

Deprest regularly makes plate filters. A unique feature of our plate filters is that they can be retightened during the filtering process, without releasing the pressure or interrupting the process.

09 April 2018

Large ducting project

The attached photos show part of a large ducting project recently welded by Deprest.

Given the application (gas at a temperature of 600°C will flow through these pipes), the end customer had set extremely high quality requirements.

09 March 2018

Chocolate tank

Here's an interesting video found on the Internet/YouTube:

11 December 2017

Skilled professionals

Deprest has spent several years installing cutting-edge technology and equipment.

Ever since 2013 when we added a new building, we have equipped ourselves with the latest technology in the areas of cutting, rolling and welding, and our new building has even been extended because it was too small. Notwithstanding all this new technology, we wouldn’t have gotten where we are without skilled professionals.

16 September 2017

New pickling hall

Our new pickling hall was put into use in the autumn of 2016.

03 July 2017

Deprest has invested in a new heavy-duty profile bending machine

In the context of the workshop expansion, Deprest has invested in a new heavy-duty profile bending machine, of the Sahinler HPK 100 type. This new bending machine allows us to significantly expand our capabilities.

This machine will be used for our own production, but also for subcontracting projects.

13 June 2017

New PED regulation

After more than 10 years, a new Pressure Equipment Directive (PED) recently came into force, PED 2014/68/EU, which replaces the former 97/23/EU.

This applies to all pressure vessels which are sold on the European market after 19/07/2016. It goes without saying that Deprest will apply the new regulation.

It would take us too long to explain all the differences here, but feel free to contact us should you have any questions.

14 April 2017

New! Plasma keyhole welding installation broadens Deprest technical range

It’s operational! Our new plasma keyhole welding installation!

Once our people were trained, they tried it out in real-life production conditions with very good results, for both butt welds and fillet welds.

The installation offers opportunities for plasma keyhole welding as well as TIG welding.

13 December 2016

Focus on sheet metal work

In addition to pressure vessels and boilers, Deprest also regularly produces sheet metal and constructions.

The attached photos show a hopper in stainless steel, pickled.

12 April 2016

Project in the spotlight: ice buffer vessel

Ice buffer vessel, stainless steel 304, externally insulated. The pressure vessel is designed for pressures up to 4 bar.

The vessel has a capacity of 94,000 litres, is 10 metres in length and 3300 mm in diameter without insulation.

08 April 2016

Gouging

Spurred by growth in the number of projects with greater wall thicknesses, Deprest has invested in a 1000 A gouging machine

21 October 2015

Recent realisation: pressure vessel with halfpipe

The attached photos show a recently manufactured pressure vessel consisting of boiler steel plate with halfpipe. Part of the vessel was assembled using the submerged arc welding process, while the remainder was manually welded.

A half coil jacket is made by welding a half pipe around the vessel.  A plug flow with a heat transfer fluid passes through this pipe, allowing for a fast and uniform regulation of the vessel temperature. 

19 October 2015

Recent realisation: compressed air tank

Deprest created a compressed air tank for Total. This pressure vessel was made from ASME SA516 grade 60 pressure vessel steel plate in accordance with VLAREM II regulations.

13 October 2015

Stereo welding

Stereo or simultaneous welding is a method regularly used at Deprest. As the word suggests, this is a method where 2 welders weld a sheet or pipe on both sides at the same time in order to achieve a perfect lap. The difficulty here is to have the welders welding at exactly the same speed, so they need to be adjusted to match each other perfectly.

25 April 2015