BRAZING ALLOYS FOR HVACR INDUSTRY

September 21, 2022

Francesca

HVACR (acronym of Heating Ventilation AirConditioning Refrigeration) is one of the industries that uses a lot of different kinds of brazing alloys. Production, maintenance, and installation of Refrigerating, Air Conditioning and Heating plants depend on right brazing processes of the parts.

STELLA deeply knows HVACR industry: since 1994, in facts, we have provided more than 500 HVACR manufacturers with a wide range of brazing consumables, characterized by top quality and production efficiency. Copper-phosphorus alloys, silver alloys, brass, copper and aluminum alloys, and soft-soldering alloys, available in different dimensions and make-ups, are some of the most requested products. Moreover, thanks to our long experience in the field, we are able to offer high-level technical support in choosing suitable alloys and performing brazing operations for any specific application.

SECTOR CHALLENGES

Presently, the field is facing new challenges. New targets of HVACR are:

  • high and consistent quality,
  • energy saving,
  • healthy working conditions.

The attention to healthiness and safety represent the basis on which a new model of business should be established, in order to be prepared for the immediate future.

NEW NEEDS, NEW SOLUTIONS

STELLA suggests two product lines in order to meet these emerging demands.

  • PREFORMS FROM WIRE AND STRIP

Preforms are often used in automated processes, but they are also well suited for small series. They drastically reduce scraps and rework, that means saving time and money. In fact, each preform is studied and fine-tuned for a specific application, so the brazing joint is always as defined.

Find out more about BRAZING PREFORMS

  • FLUX CORED ALLOYS

Cored alloys represent an important improvement for products’ reliability and operators’ health. Thanks to this technology, the operator is not in contact with the flux that, located inside the alloy, is released when and where necessary, in just the right amount. So, the probability of flux inclusions is reduced and less fumes are released during the process of brazing. The use of flux cored alloys is still not very popular but it is destinated to spread to the most important applications, including HVACR.

Find out more about FLUX CORED ALLOYS

TEST US!

Do you use preforms and cored alloys for your brazing applications? Have you tested our products, yet?

If you are interested in testing a product that you have never bought before, you can do it without running rinsks. In fact, you can take advantage of SATISFIED OR REIMBURSED promotion: order a new product and you pay it only if you are satisfied. Otherwise, only shipping cost will be charged to you.

Contact us for more information or ask for a quotation: info@stella-welding.com


BRAZING FOR TOOL MANUFACTURING

September 9, 2022

Francesca

Read our brochure: BRAZING ALLOYS FOR TOOLS

The production of brazed tools, in every field and application, requires top quality row materials and a high level specialistic know-how.

But what do we mean by “brazed tools”? What are their applications and purposes?

WHAT “BRAZED TOOLS” MEANS

In every brazed tool, body and cutting edge are joined together through a brazing process.

The features of body and blade are different, so they are realized with different materials.

The body (resistant and durable) is usually made of steel. In case of breakage of the blade, the body is usually intact and reused. On the other hand, the blade could be often replaced in case of damage. Blade is made of materials that could be grouped into two macro-categories:

  • Based on powders of diamond;
  • Based on cemented carbides.

Brazing is able to guarantee a very strong joint between body and blade, the essential condition to respond to the great effort during material cutting.

A WIDE RANGE OF TOOLS

There is a wide range of brazed tools which have different shapes and dimensions, in accordance with their purposes. Some of the most common brazed tools are: saw blades, diamond wires, milling cutters, drills and core bits, but also chippers, tools for medical field, digging tools, agriculture tools… And the list is still long!

APPLICATIONS 

We find brazed tools in several fields, for working very different materials:

  • Wood

The purposes of wood-working tools are many: cutting of trunks, debarking, refinement of semi-finished products and profiling.

  • Aluminum
  • Plastic
  • Marble, granite and other natural stones

Tools are used for mining, cutting into stone slabs, shaping and finishing.

  • Concrete

Tools for working concrete are generally used for cutting, drilling or coring.

  • Ferrous materials

Again, the aims are various: from rough grinding, to finishing and super-finishing.

  • Heterogeneous materials

It is the case of well drilling, tunnel excavation, mining processing or tillage. For heterogeneous materials, tools should be resistant but also economical, because they are subject to unavoidable breakings and replacements.

Some applications

BRAZING ALLOYS FOR TOOLS

A lot of brazing alloys, of different materials and make-ups, are used to realize the wide range of tools. Also the brazing process is not always the same, but it depends on specific needs of production.

  • Materials

There are a lot of suitable alloys, from the most expensive alloys with high amount of silver, to more economical ones with a small amount of silver or even without it. In addition to silver alloys (the most common ones), there are normal or special brasses, copper alloys and nickel alloys.

  • Make-ups

The make-ups are numerous: rods, wires, strips, trimetals strips, powders, pastes, preforms from wire or strip.

  • Brazing processes

The joint between tool’s body and cutting edge can take place through torch brazing, generally in case of non-automated processess, or induction brazing, for series production. Sometimes resistance brazing is used and, in specific cases, also furnace brazing, with protective and vacuum atmosphere.

Some brazing alloys

DIFFERENT NEEDS, ONLY ONE SUPPLIER 

Every company requires different technologies in order to respond to market demands: Stella offers complete solutions to each one of them. We supply more than 500 manufacturers of tools worldwide, with high quality alloys and prompt technical assistance.

If you are looking for a supplier of brazing alloys, but also a reliable, expert technical partner, contact our sales department. We put our experience to the service of your business.

info@stella-welding.com

Read our brochure


LIGNA 2023 – COME AND VISIT US!

September 2, 2022

Francesca

Hannover, 15-19 May 2023

STELLA will exhibit at LIGNA, the international trade fair of innovations for wood industry.

We are waiting for you in Hannover to show you the latest technologies about brazing, the specific alloys for manufacturers’ demands and the most performing processes.

Are you a manufacturer of tools? Would you like to find out more about our supply? LIGNA is a great opportunity to meet us!

Come and visit us!


COPPER BRAZING PASTES: THE MOST ECONOMICAL CHOICE FOR SERIES PRODUCTION

May 24, 2022

Francesca

Copper brazing pastes are homogeneous mixtures obtained from filler material in powder, flux and binder, chosen according to base materials to be joined and oven atmosphere. They are perfectly suitable for low carbon steel and stainless steel. The brazing method that uses copper brazing pastes is particularly appreciated for reasons of productivity and costs.

It can be applied only in some contexts and fields… Let’s find out more!

APPLICATIONS AND ADVANTAGES

Before starting the process, copper paste is distributed on surfaces with specific hand or automatic dispensers: they release only the right amount of paste for brazing.

Brazing takes place in static, vacuum or continuous furnaces with controlled atmosphere (protective or reducing). So, you can easily understand that brazing with copper pastes is well-suited for series production, for a great number of standardized joints.

Compared to traditional methods with solid alloys (rings and other preforms from wires and strips) in furnace, copper pastes permit higher productivity and a good saving of costs, but they also require a particular attention to operating procedures.

Fields that use this brazing process are the same that involve series productions, especially automotive, refrigeration and heating systems, electrical industries.

OUR OFFER

The offer of Stella srl includes high quality copper brazing pastes, but it is not limited to products: in fact, we provide technical and prompt assistance in suggesting the most suitable alloys and the right operating processes for your specific needs.

Moreover, don’t forget we offer other pastes and powders for copper-phosphorous, nickel, aluminium, silver alloys and soft solders, too.

Are you interested in copper brazing pastes or would you like to receive more information about products and applications? Your sales technician will help you to find the best solutions for your needs.

Contact us!

Find our more about COPPER BRAZING PASTES


FLUX CORED ALLOYS: THE INNOVATION COMES THIS WAY

May 17, 2022

Francesca

We talk about flux cored alloys when flux, an essential element for the success of brazing, is located inside the alloys. Recently developed, flux cored alloys are an alternative to traditional processes, that require flux separated from alloy, or flux coated rods. The aims are to increase the final results, to reduce costs and to safeguard operators’ health.

This technology is especially suitable for silver and aluminium alloys, but also for brass and copper alloys, in rods, wires and preforms from wire (rings) make-ups. By its very nature, it can’t be used with very thin wires (less than 1 mm in diameter).

In cored alloys, the flux is in powder presentation form, in order to avoid oxidation, and it is along the entire lenght of wire.

This new approach is still not very popular, but it is destinated to spread to the most important applications, where quality of final result and safety of operators are priorities. We can easily understand that innovation of brazing comes this way.

TRADITIONAL METHODS OF BRAZING: STRONG POINTS AND LIMITATIONS

The most familiar method for brazing consists in using flux separated from alloy. This process is very versatile: it is suitable to join every alloy, of any make-up, size and material, with every flux, in powder, past or liquid form. The most important weakness of this method concerns final results, that are linked closely to the technical skills of operator. The common trend to use more flux than necessary can affect the quality of final product and, in any case, it involves high cost for post-braze cleaning. Another limitation is about the safety of operator: during the process of brazing, he is in contact with chemicals and exposed by fumes of flux.

The use of alloys covered by flux is certainly less versatile (it is suitable only for rods), but very frequent, too. Maintainers and installers, who often operate in situations of low practicability, tend to choose this convenient method. The use of coated rods has the same limitations of separated flux. The final resut depends on operator, who must avoid inclusions caused by the large amount of flux around the alloy. For this reason, post-braze cleaning is an expensive process. Then, this method of brazing is unhealthy for the operator, who has to protect himself from physical contact of chemicals and from flux inhalation.

FLUX CORED ALLOYS: STRONG POINTS AND LIMITATIONS

Problems of traditional brazing methods can be overcome by the use of flux cored alloys. In fact, thanks to flux cored alloys, we can obtain these advantages:

  • QUALITY IMPROVEMENT AND STABILITY: inside the alloy, there is the right amount of flux (the quantity you need), that is released when the alloy starts to melt (when you need) and, with appropriate tips, only in predetermined points (where you need). So, flux inclusions are reduced and quality of joints doesn’t depend on operator’s expertise anymore.
  • COST SAVINGS: minimum amount of flux means minimum costs for post braze cleaning, too.
  • MORE ATTENTION TO HEALTH: with the use of cored alloys, safety risks are minimized. The operator is no more in contact with the flux, which is inside the alloy, and less fumes are released.

The main weak point of flux cored alloys is the high cost of production, much higher than separated alloys and coated rods. By the way, you should remember that this technology guarantees top quality of final results, and reduces failures, reworks, scraps and post-braze cleaning.

Flux cored alloys: some applications

APPLICATIONS AND FUTURE PERSPECTIVES

Now, flux cored alloys are used in cutting-edge fields, where high-quality standards are required. In particolar, we are talking about aerospace, automotive, refrigeration and appliances and electrical industries.

For the important advantages on productivity and safety, we are sure that the future of brazing will follow this path, both in fields that already use this tecnology and in new areas that are looking for high performances.

Are you interested in flux cored alloys or would you like to have more information about products and applications? Contact your sale technician or send and email to info@stella-welding.com.

 

Find out more about FLUX CORED ALLOYS


Q&A - BRAZING: NEWS AND FUTURE SCENARIOS

May 10, 2022

Francesca

  • What exactly are brazing alloys and what are they used for?

Brazing is a particular welding system, used to obtain hermetic, with very good mechanical properties and of excellent aesthetic appearance joints.

Brazing differs from welding by the fact that the base materials are not melted during the process, and by the fact that, by this system, it is possible to easily join together also different metals (e.g.: steel to copper, copper to brass, copper to aluminum, etc.).

Brazing alloys are usually available in a wide variety of chemical compositions and of presentation forms, in order to satisfy even the most stringent requirements.
It is possible, anyway, to group them in the following families:

Silver based alloys: used to join all metals, with the exception of aluminum and magnesium, they find their applications in many different sectors, such as general construction, refrigeration and air-conditioning industries, silverware and do-it-yourself.
Copper-phosphorus alloys: dedicated to the joining of copper and its alloys, they are widely used in the refrigeration and air-conditioning sector for the brazing of copper pipes and connections.

Aluminum alloys: used for the low temperature joining of aluminum.

Tin-based alloys: usually known as soft-solders, these alloys find the most applications in the electronic and electrotechnics sectors, as well as in the general construction.

 

  • Which parameters are needed for an optimal choice for the proper alloy to be used?

First it is necessary to identify the base metals which have to joined. After that it will be possible to select the most appropriate family of alloys to be used. Finally the exact alloy will be chosen considering the desired brazing temperature and fluidity.

It is here important to note that lower melting alloys possess higher fluidity and are usually easier to be used, being ideal for capillary brazing jobs.
Higher melting alloys, on the other hand, are less free-flowing and more suited for build-up and for filling of large joints.

 

  • When looking to the brazing alloy market, what is the main strength and advantage of Stella Welding Alloys compared to its competitors?

Stella Welding Alloys is always recognized for the very ample range of products that are offered to Customer. This includes not only the different alloy compositions, but also the complete line of presentation forms (rods, flux-coated rods, wires, strips, powders, pastes, rings and preforms).
In addition we can offer a very fast service without minimum order requirements for the major part of the offered products.

  • What is the most important industry news? What has Stella Welding Alloys done to remain updated ?

The most significant news has been the regulatory updates regarding the chemical substances used in the formulation of the brazing fluxes.
Since some years Stella Welding Alloys has been ahead of times, being today able to provide fluxes which do not contain substances considered of concern for the human health and for the environment.
Stella Welding Alloys, moreover keeps itself always on the cutting edge, by studying and implementing new alloys to satisfy the multiple and specific requests received from numerous Customers.

 

  • What do you see in the future of brazing alloys industry ?

In the coming years we will see, from one hand, the development of new alloys with reduced silver content while, from the other hand, it will become more and more important the compliance with increasingly stringent technical and environmental regulations on the existing products.
Both aspects will require additional research and development activities: Stella Welding Alloys is already dedicating considerable energy and commitment to these elements.


NOT ONLY BRAZING: OUR CONSUMABLES FOR WELDING

April 22, 2022

Francesca

With almost 30 years of experience, our company is specialized in providing brazing alloys, in all compositions, make-ups and sizes, both standard and special. Quality, flexibility and prompt service: thanks to these features, we supply more than 2000 customers worldwide.

In addition to brazing consumables, Stella proposes also a supply of consumables for welding, that respect the same quality standards.

CONSUMABLES FOR DIFFERENT WELDING PROCESSES 

Stella offers a wide range of consumables, useful for different welding processes.

Here the processes involved.

  • TIG (Tungsten Inert Gas): this is an arc welding process that uses a turgsten electrode, protected by an inert gas. It is used when high quality of final result is more important than high speed of production.
  • MIG (Metal Inert Gas) / MAG (Metal Active Gas): they are wire welding processes, most commonly used in industry, because they respond to two essential needs: affordability and productivity.
  • Oxyacetylene Welding: this process uses acetylene as primary fuel. For this reason, it is employed when electricity can’t be used.
  • MMA (Metal Manual Arc): in this case, welding doesn’t take place with the protection of a gas, but of an electrode. For this reason, it is called Electrode Welding.

OUR WELDING CONSUMABLES

Our offer of welding consumables includes mostly rods and wires, for:

  • Aluminium based alloys;
  • Copper based alloys;
  • Low alloyed steel;
  • Stainless steel;
  • Nickel alloys;
  • Cast Iron.

Brazing remains our core business, but now our customers can find also the welding alloys they use in production or maintenance.

FIRST OF ALL, COMPETENCE, FLEXIBILITY AND QUALITY

We have increased our range of products in order to offer an even more comprehensive service to our customers, that now can buy the brazing and welding alloys they need from one single supplier (and save on shipping costs, too). However, our values are still the same: flexibility, high-level technical support, Made in Italy quality.

Also for welding products, you can take advantage of the “Satisfied or reimbursed” promotion: you can order your first supply and pay only if you are satisfied. Otherwise, only shipping cost will be at your expense.

Test us! Contact the sales department: info@stella-welding.com


CHILLVENTA 2022 – VISIT US!

April 8, 2022

Francesca

Nuremberg, 11th-13th October 2022

This year too we will exhibit at Chillventa, international meeting place dedicated to last technologies about refrigeration, AC, ventilation and heat pumps.

For Stella srl, Chillventa will be the unmissable opportunity to present our wide range of brazing and welding alloys, meet customers from all over the world, establish new contacts… And live three days in name of innovation!

Visit us!


MARMOMAC 2022 – VISIT US!

April 8, 2022

Francesca

Verona, 27-30 September 2022

Stella srl will exhibit at the 56th edition of MARMOMAC, the world fair dedicated to stone production chain, from the quarry to the processed product, from the technologies and machinery to tools.

For our company, Marmomac always represents an important opportunity for meeting experts in the field, especially manufacturers and retailers of diamond tools for marble processing.

Come and join us!

HALL 7 – STAND C9


BRAZING ALLOYS FOR ARTISTIC PRODUCTION

March 14, 2022

Francesca

WHO ARE THE ARTISTIC BLACKSMITHS 

A real art form arises when metal meets craftsmanship tradition and creativity. This art form is realized by artistic blacksmiths, experts in metalworking who create unique pieces of uncontested aesthetic value.

Where the name “artistic blacksmith” comes from is easy to understand: he is specialist in metalworking and he puts his talent at the service of beauty.

MAIN MANUFACTURES 

Artistic blacksmiths realize unique and original pieces on the basis of customers’ demands. Some of the most frequent applications are: tables, chairs, different furniture accessories, lamps, gates and barriers, silverware and jewellery (teapots, frames, accessories…), elements of funerary art, musical instruments etc.

Customers who rely on artistic blacksmiths look for custom-made solutions, likable and resistant at the same time. For this reason, the artistic blacksmith needs top quality materials, which don’t compromise the look of final products.

BRAZING: A PROCESS AT THE SERVICE OF BEAUTY

The process for joining materials (also very small parts) used by artistic blacksmiths is brazing. Unlike other techniques, brazing doesn’t leave traces in final product and aesthetic aspect is not compromised.

For specific needs of artistic blacksmithing, Stella Welding offers a wide range of brazing solutions, both standard and customized.

PRODUCTS FOR SPECIFIC NEEDS OF ARTISTIC BLACKSMITHING 

For artistic blacksmiths’ requirements, we offer a wide range of brazing alloys, soft solders and brasses, in different make-ups and sizes. We manufacture also rods and wires so thin to be invisible in final products.

Another important aspect about aesthetics is the colour of alloys, which have to be in line with the other elements of product. Moreover, we will choose specific fluxes, easily removable, that don’t leave traces.

Quality of our alloys ensures strenght and aesthetic harmony of final products. Zero porosity and step-brazing option, for close brazings, are two important features of our alloys.

In our products, you will find true italian tradition, passion and innovation.

A RELIABLE AND COMPETENT PARTNER

With more than 25 years’ experience, we are specialized in providing solutions in brazing applications. Our company is focus on customers’ satisfaction and we offer them flexibility, technical support, quick and customized solutions.

Are you an artistic blacksmith? Are you looking for a reliable partner for high quality brazing solutions? Contact the sales department in order to find out our reality and our products: info@stella-welding.com.

We don’t require minimum production batches and you can take advantage of the “Satisfied or reimbursed” promotion: if you want to try a new product, you will pay only if you are satisfied. Seeing is believing!