We at “The Monty Heat Treat” have always maintained that our favorite heat treat exhibition outside of the USA is the annual “HK” show held October of every year in Cologne, Germany (before Cologne it was held in Wiesbaden, Germany).
For a variety of reasons, the show this year which took place from September 30th to October 2nd, moved back to Wiesbaden and took the form of a series of lectures with a few “tabletop” exhibitors. In spite of the much smaller format attendees deemed the show a success with slightly over 300 registered participants. The reduced attendance and the less formal exhibit hall meant smaller and less international but allowed for a more casual atmosphere.
We have these two photos of the show, both courtesy of Mr. Harald Roth of German furnace builder “KGO”. In the first photo we have from left to right: Harald Roth (KGO), Nedelijko Vucemilovic (KGO) and David Xu (FH casting).
In the second picture we have a number of members of the KGO Team including; “Harald Roth, Georg Cluse, Nedeljko Vucemilovic, Stella Vucemilovic and Max Merschen”. George is a KGO representative based near Kleve, Germany, Stella Vucemilovic is the daughter of the company owner Nedeljko Vucemilovic and Max Merschen is a design engineer for the company.
Our understanding is that the show will return to Cologne in 2026 and will be much larger than this year’s show.
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Collins Aerospace is an American technology company and global leader specializing in advanced aerospace systems and avionics, serving commercial, business, military, space, and airport sectors.
They design and manufacture avionics, flight control systems, and communication solutions for commercial and military aircraft. Collins Aerospace also develops innovative interiors that enhance passenger comfort and operational efficiency, along with software that streamlines data management for airlines, airports, and maintenance teams.
VESCO, part of the Busch Group, provides its expertise in installation and service for vacuum systems used in the heat treating and brazing of superalloys, processes trusted by leading aerospace manufacturers such as Collins Aerospace, which utilize Busch Vacuum Solutions technology.
Superalloys are preferred in aerospace for their exceptional resistance to high temperatures and corrosion. By using a dry vacuum system with reliable pumping speeds, Collins Aerospace has reduced maintenance costs and improved production efficiency by 80%.
Heat Treatment at Collins Aerospace
The alloy is heated in a vacuum furnace, a sealed chamber where most air and reactive elements are removed to prevent oxidation and contamination.
A vacuum system connected to the chamber extracts oxygen and nitrogen, creating a clean environment for precise material processing.
Common vacuum furnace processes include vacuum brazing, annealing, precipitation hardening, tempering, normalizing, and stress relieving, each tailored to the specific needs of the material being processed.
Vacuum Brazing Process
Collins Aerospace uses a very precise process that involves several key steps:
1. Clean: Remove dirt or impurities from all parts before brazing.
2. Assemble the Braze: Attach the filler metal (foil, paste, powder, or thread) to the parts.
3. Position: Place the parts on the furnace frame.
4. Heat: Use a vacuum furnace to heat the parts until the filler metal melts.
5. Allow Filler to Flow: Capillary action pulls the liquid filler into the joints between each piece.
6. Cool: Allow the filler to solidify and form a bond between the parts.
7. Inspect: Visually inspect parts for any issues.
8. Test: Perform any final tests on all parts.
Overcoming Challenges
Collins Aerospace previously used an oil-sealed rotary piston pump (OSRP) in its vacuum brazing process but faced several limitations. The pump’s large oil reservoir managed soot by-products, which created an oil waste stream that required time-consuming disposal about 3 times a year.
In addition to being labor-intensive and adding operational costs, the OSRP struggled to deliver consistent pump-down times and stable vacuum levels, both critical for high-precision brazing. Its noisy operation also contributed to an unpleasant work environment.
To improve reliability, efficiency, and overall working conditions, Collins Aerospace sought a cleaner, more advanced vacuum solution.
The Right Team, the Right Solution
To improve their vacuum brazing process, Collins Aerospace turned to VESCO, part of the Busch Group, for expert guidance and support. The VESCO team assessed the existing system and, in collaboration with a Busch Group representative, recommended replacing it with the Busch COBRA dry screw COMBI vacuum system, a cleaner, more efficient solution tailored to their needs.
COMBI vacuum pump units are the perfect vacuum generators to meet the precise requirements of Collins Aerospace’s manufacturing process. These compact systems combine a dry screw vacuum pump and a rotary lobe vacuum booster into a single unit. The working pressure and pumping speed can be finely tuned to match virtually any process condition or pumped medium thanks to the customization from the numerous configuration options.
COBRA vacuum pumps maintain high pumping speeds across the entire vacuum range while operating with exceptional efficiency. Their oil-free, contact-free design minimizes wear and significantly reduces maintenance requirements, making this the ideal solution for Collins Aerospace.

Since installing the Busch COBRA COMBI unit, the Collins Aerospace team has experienced several significant advantages:
Faster pump down: The new unit allowed their furnace to pump down 80% faster, resulting in quicker production cycles.
Increased production: With the improved pump-down cycle, the customer achieved higher production throughput.
Reduced noise: The noise level significantly decreased, making an easier work environment.
Consistent performance: Reliable pump-down times and stable vacuum levels enhanced process consistency.
Reduced maintenance: The oil-free and contact-free design requires far less upkeep than the previous system.
Cost savings: Eliminating oil disposal and related maintenance tasks cut operating costs.
Keeping it simple: Maintenance has been simplified by eliminating filter replacements and valve deck adjustments.
Streamlined operations: No more 55-gallon oil drum storage or handling.
VESCO Vacuum Expertise
These improvements were made possible by the expert team at VESCO, who managed the installation and integration of the Busch COMBI system. VESCO continues to support Collins Aerospace through preventative maintenance programs that help ensure long-term efficiency, reliability, and vacuum system performance.
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Vacuum & Continuous Furnace Brazing services
- Vacuum & Atmosphere Heat Treating Services
- Honeycomb Brazing services
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Fluoride Ion Cleaning (FIC)
“At the Metal Treating Institute (MTI) fall meeting, Bob Hill, President of Solar Atmospheres of Western PA and Michigan, received the prestigious Heritage Award—the highest honor presented by MTI. This award recognizes an individual’s lifetime commitment and significant contributions to advancing the commercial heat treating industry.
For additional information about Solar Atmospheres, contact Mike Johnson at 855-934-3284 x2223, email at [email protected], and visit us at solaratm.com.”
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The “Bodycote”, Livonia location in Michigan has always had a strong focus on vacuum carburizing of automotive transmission components and features a number of “ECM” systems.
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Solar Atmospheres HFL-5748-2EQ Vacuum Furnace, 2850-F, 2 Bar, Diffusion Pump
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High Temp Fan Assembly
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2 Bar Quenching Vacuum Furnace-Excellent Condition 36″ X 22″ X 22″
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Busch “Cobra” Dry Screw Vacuum Pumps (2 available)
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Struers Axitom-5 Automatic Saw 14”
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August 14th of this year it was announced that “AICHELIN Group” of Mödling / Austria would be acquiring the NTS & UPC business units from NITREX Inc., a portfolio company of Novacap “Blockbuster Acquisition in the Global Heat Treat Furnace Industry”. This press release tells us that this acquisition has now been finalized.
The question on heat treat industry insiders lips these days is now; “how will Aichelin reconcile two competing sales networks, that of the Aichelin Group and that of the former Nitrex NTS & UPC divisions”? Rest assured that when decisions are made “The Monty Heat Treat News” will be the first to let you know.
“Mödling / Austria – The AICHELIN Group, one of the world’s leading providers of heat treatment solutions, has finalized the acquisition of the NTS & UPC business units from NITREX Inc., a portfolio company of Novacap, a leading North American private equity investor. The HTS division of NITREX is not part of the transaction.
With around 250 new employees in the USA, Poland, Germany, France, and China, the AICHELIN Group is expanding to more than 1,350 employees in total, generating combined revenues of approximately 230 million euros. This represents the largest acquisition in the company’s history and marks another milestone in the implementation of its Strategy 2030.
The acquisition expands AICHELIN Group’s technology portfolio with leading expertise in nitriding furnaces and strengthens its presence in key industrial regions. The integration of the NITREX sites will take place step by step, in close coordination with the respective local leadership teams.
Consistent Implementation of Strategy 2030; With its Strategy 2030, the AICHELIN Group has set a clear roadmap for sustainable growth and technological advancement. The focus is on diversification into new industries and applications, driven both by in-house development initiatives and targeted acquisitions. Under the motto “think global, act local”, the emphasis lies on tailoring products, services, and structures to regional market requirements in order to strengthen customer proximity and responsiveness.
With the integration of NITREX, the Group is consistently executing this strategy: the portfolio is being expanded with leading nitriding technologies, while at the same time strengthening its presence in the Americas, Europe and Asia with additional sites.
About the AICHELIN Group The AICHELIN Group, headquartered in Mödling near Vienna and part of the Berndorf AG, is one of the world’s leading providers of heat treatment solutions. Its portfolio includes industrial furnaces, industrial heating systems, nitriding systems, control and automation systems, Industry 4.0 solutions, as well as service offerings. The company’s roots date back to 1868. In addition to the traditional AICHELIN brand, the Group includes AFC-Holcroft, SAFED, BOSIO, NOXMAT, and NITREX, making it one of the world’s top three heat treatment companies with around 1,350 employees. The AICHELIN Group operates subsidiaries in Austria, Germany, Slovenia, France, Poland, Turkey, China, India, and the USA. Its global presence is further strengthened by an international sales network. www.aichelin.com“
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