FAQ

You will find all answers to questions that have been asked here.

General information

  • Where are the interfaces between PVA and my production line?

    You define the interface between your production line and the service offering in our plants. For instance, you can deliver the components for brazing to us fully machined, we clean them, perform the vacuum brazing process, and conduct any checks that may be necessary (e.g. impermeability). Naturally, we can assist with queries about material selection and creating component designs that are suitable for brazing.

    The decision is yours—just talk to us. We will work with you to develop the optimum manufacturing strategy for your products.


Vacuum Brazing

  • Is it also possible to perform vacuum brazing for large quantities?

    Vacuum brazing is equally as suitable for joining single parts as it is for series production. Depending on the size of the component or the furnace, up to several hundred components can be processes simultaneously in a single furnace cycle. Fully-automated process management allows the systems to operate without supervision and ensures reproducible component quality.

  • Can I also have entire assemblies manufactured and brazed at PVA LWT?

    We are also happy to manufacture entire assemblies for you based on your drawings. We can also assume responsibility for scheduling, material procurement, storage, mechanical fabrication (turning, milling, grinding, eroding, etc.), and quality assurance.

  • What requirements must components for brazing fulfill?

    A design that is adapted to suit the brazing technology used is a key criterion for successful vacuum brazing. This includes the dimensioning and position of the brazing gap as well as the choice of solder and the associated process parameters. Offering advice on designs that are compatible with brazing technology is part of our core expertise—just talk to us.


Diffusion Bonding

  • Is it possible to bond multiple components in a single furnace cycle?

    The furnace cycle is the primary driver of costs in diffusion bonding. By combining multiple components (of the same height and the same material), this process can become extremely efficient.

    Contact us for a non-binding quotation.

  • What requirements must the component fulfill?

    In diffusion bonding, the surface of the join is a key criterion for ensuring a secure material joint. The general rule is that the lower the surface roughness and waviness of the component, the better the joining result. Macroscopic damage such as scratches or cracks should always be avoided to ensure the highest levels of impermeability and strength.

  • Can the service also be used for development projects?

    This system is also available for individual development projects. Furthermore, our engineers can offers assistance in creating designs that are suitable for diffusion bonding.

  • Is series production also possible?

    The diffusion bonding system at PVA Löt- und Werkstofftechnik GmbH is also available for series production. A corresponding annual batch size has a positive impact on pricing.

  • I am not sure if this joining technology is suitable for my component. Who can I contact?

    • For general questions about diffusion bonding, please contact Mr. Melechin (lwtinfo@pvatepla.com).
    • For specific questions concerning the technical design of components for diffusion bonding, please contact Dr. Pfeiffer (lwtinfo@pvatepla.com).
  • Which material combinations are possible?

    Successfully joined similar material pairings:

    • Austenitic steels (1.4301, 1.4404, etc.)
    • Tool steels (1.2344, 1.2343, 1.2083, Böhler M333, etc.)
    • High-alloy aluminum materials (e.g. AW 6061)
    • Copper (oxygen-free)
    • Titanium, and many more.

    Successfully joined dissimilar material pairings:

    • Tungsten to copper
    • Titanium to copper
    • Steel (e.g. 1.2767) to copper and many more.
  • How much material allowance should be included?

    Since buckling of the material occurs due to the process, an allowance of 1% to 5% should be included.

  • How long does a diffusion bonding process take?

    A furnace cycle lasts around 24 hours—including heating up and cooling down.

  • What is brazing supported by pressing force?

    Large-scale joints cannot be brazed without distortion. Material distortion during vacuum brazing is problematic insofar as it can lead to brittleness and therefore a loss of strength due to the enlargement of the brazing joint. The application of sufficient pressing forces in the hot press can prevent this distortion. The result is securely brazed material joints.


Vacuum Heat Treatment

  • Can highly reactive materials such as niobium, titanium, and zirconium be treated?

    Our vacuum furnaces meet the highest requirements in terms of process stability and an ultra-pure vacuum atmosphere. As a result, it is also possible to handle highly-reactive materials while preventing undesirable reactions with the surrounding atmosphere.

Contact Details

Dr.-Ing. Pfeiffer

Board of Management
Fax: +49 641 68690 810

Mr. Melechin

Sales/Marketing
Fax: +49 641 68690 810

Immediate Contact

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PVA Löt- und
Werkstofftechnik GmbH

Im Westpark 17
35435 Wettenberg, Germany

Phone: +49 641 68690 750
Fax: +49 641 68690 810