Production line for hot water tanks

Hot water tanks with heat exchanger are increasingly in demand. This is because they offer an efficient and environmentally friendly way of producing hot water. The heat exchanger makes it possible to make optimum use of heat from various energy sources, such as solar energy, waste heat or heating water. This leads to better energy utilization and can reduce operating costs. In addition, such stainless steel systems are often durable and reliable, making them an attractive solution for households and businesses.

Would you like to benefit from this market development for heating appliances with new technology and efficiently manufacture stainless steel boilers with heat exchangers?
In medium or large batch sizes?

With our systems, you are way ahead of the competition!

With our circumferential seam welding stations for shell-bottom-manufacturing, you can join the top and bottom with attachments from upstream production - including heat exchanger - to the schell in a fully automated process. Joining, edge detection, tacking, welding and seam testing all take place in a single process. Depending on the material and design, different lines with possible internal gas flushing are available.

The shell production can be integrated upstream by longitudinal seam welding from the coil to the shell.

Your advantages with our production steps

in longitudinal seam welding from the coil to the jacket
> Cut to length with laser: clean cutting edges thanks to laser shears for duplex steels etc., no set-up and wear of mechanical shears when cutting to length
> Laser cutting of holes for later connections: tool-/equipment-free and flexible fixing of the holes
> Roll forming and longitudinal seam welding: Material savings thanks to the production of tubes in sheet thicknesses of 0.8 - 1.5 mm, changing the diameter during round bending without changing parts or set-up, less deformation on the shell due to lower heat exposure during laser welding of the longitudinal seam
> Laser trimming of edges: ideal preparation for the slim, high-quality design of the circular seam with laser-only

in circumferential seam welding for shell-to-bottom production
> Assembly shell with bottom and top: fully automated joining line
> Laser welding of bottom and top under shield gas: higher productivity due to possible laser welding speeds of up to 6 m/min, significant reduction in rejects, as exact butt weld seams without leaks and therefore no reworking in the T-joint area, cost savings compared to conventional welding processes (e.g. MAG), as laser welding generally does not require process consumables such as filler wire

We implemented this system technology:

Cycle times 15 – 90 sec
Wall thicknesses 0,8 – 1,5 mm
Laser only
TIG/Hybrid

You too can benefit from our more than 35 years of experience with laser welding applications. Numerous proven solutions in the field of laser-welded pressure vessels with worldwide reference installations since 2001 speak for themselves.

Our solutions for your production

Longitudinal seam welding: Flexistar
The proven Flexistar concept is a flexible production line for thin-walled shells up to a maximum thickness of 1.5 mm, diameters of up to 630 mm and shell heights of up to 2000 mm. As a compact machine that combines multi roll forming and a continuous laser welding station, the Flexistar does not require a tool change when changing the shell diameter. Flexistar can be extended with a cut-to-length line, a 2D laser cutting station and laser trimming. The Flexistar line can produce up to 150 shells per hour.

Circumferential seam welding: Bottom-Shell-Production MBF 600
The MBF circumferential seam welding station MBF is ideal for connecting the top and bottom to the shell of a container by laser butt welding. Proven clamping devices and seam tracking ensure the best possible welding results. The MBF impresses with short changeover times and the possibility of automating the loading of bottoms and casings as well as the unloading of the welded container. Depending on the machine version, diameters of up to 600 mm can be welded. Various laser welding processes can be offered on customer request. Up to 60 tanks/hour can be produced with one MBF 600 station. The addition of a 2nd MBF station increases the output.
The MBF can be linked with Variostar or Flexistar to form a fully automatic system.