THE SCOPE
OF SILVER SOLDERINGS  

The following are general purpose brazing alloys, suitable to join easily a wide range of ferrous and non-ferrous base materials (iron, steel, copper, brass, etc.). At increased operating temperatures, the strength of the joints almost always decreases considerably. Short-term overruns are permitted if there is no noticeable load on the joints at an elevated temperature. If, in addition to high mechanical loads, there is an increased operating temperature, do not use hard soldering zinc containing. Continuous service operating temperatures of joints brazed with these alloys range up to approx 200°C. When joining stainless steel in wet environments, in order to avoid failure of the joint due to interfacial corrosion, it is recommended to use zinc-free alloys, or alloys with Nickel additions. Available in many different presentation forms (rods, flux-coated rods, wires, strips, rings, preforms, pastes and powders), these alloys are very free flowing, ductile and strong. All these alloys do not contain Cadmium. They are divided in two categories: alloys with Tin and alloys without Tin. Tin being used to lower the melting temperature of the alloy. When brazing in an oxidizing environment (that is: in air), the use of a proper flux is required. 

CADMIUM FREE BRAZING ALLOYS

Cadmium-free brazing alloys can be used at operating temperatures from -200 ° C to + 200 ° C. All solders can be used for any type of steel, copper and copper alloys and nickel and nickel alloys. When soldering on stainless steel, zinc corrosion can occur due to the zinc content in the solders. Tin-free solders are especially useful for joints with dynamic workloads and are resistant to overheating.

BRAZING ALLOYS WITHOUT TIN

SILVER BRAZING ALLOYS FOR SPECIAL USE

Thanks to their special composition it can be used for other applications where the usuals alloys are not recommended. The below mentioned brazing materials are appropriated for furnace brazing (URSO Ag7228), including vacuum, and for unusual and special applications: URSO Ag8515 or URSO Ag7200 is suggested when ammonia-resistant joints are requested; URSO Ag6030 when the use of zinc is not allowed. 

The wide range of cadmium free silver solders can be supplied as fluxcoated rods as well. The content of their bare brazing rod meets the composition indicated in the cadmium free brazing alloys table. Fluxcoated rods can have several external coating layers (more or less flux quantity) to meet specific customer's needs.
 

These alloys are widely used for the brazing of tungsten carbide and poorly wetting materials, such as molybdenum, tantalum, chromium and wolfram. The strength of the solder we want to achieve depends on the base material. They are cadmium-free.

When there are large inequalities between the sizes of the components composing the joint, sometimes a joint failure resulting from thermally inducted stress occurs. Perhaps the best known example of this problem is when large pieces of tungsten carbide are brazed to steel backing pieces. Braze filler composites that have a core of copper with a coating of filler metal on both surfaces (1:2:1) are frequently used to reduce the risk of cracking (sandwiched or trifoil material). 

They can be used at operating temperatures from -70 °C to +150° C. Solders are suitable for connecting copper with copper or copper alloys. When connecting copper with copper, the use of additional fusing due to the phosphorus content is not necessary. They are not suitable for steel and nickel alloys due to the formation of a fragile phase. 

FLUXES 

In order to ensure homogeneous and consistent quality, our fluxses are manufactured from the highest quality raw material with a quality guarantee. The choice of the appropriate flux depends on the melting range of the solder as well as on the characteristics of the flux itself (flow, capillary and lifetime). 

BRASSES

These filler metals are employed with good effect in the brazing of mild steel assemblies such as bicycle frames and wheelchairs. They can be used on steels, copper and copper alloys, nickel, nickel-based alloys and stainless steel where corrosion resistance is not a major requirement. The difference in composition between one filler material and another have poor effects on their performance and brazing characteristics. The addition of silicon enhances the smoothness of the resultant fillet. The addition of silver and tin helps flowing characteristics despite melting range is not much lowered. These filler metals with the addition of manganese and nickel are substantially stronger than the conventional copper-zinc alloys. URSO Brass 110 is often used for brazing tungsten carbides. A high temperature flux is required or the use of fluxcoated rods is suggested. 

Fluxcoated rods are also available. They are a good alternartive to the use of liquid flux for its performances and for the final quality of the joint. The coating flux guarantee a better protection against the oxidation arise from the heating process of the filler metal during the brazing operation. 

ALUMINIUM BRAZING ALLOYS

The URSO ALU filler metals are used to join brazeable aluminium base metals. Silicon and copper lower the melting point of aluminium and these elements are added to pure aluminium to produce suitable brazing filler metals. These alloys can be used because they melt below the solidus of brazeable base metals. URSO ALU 12 is a general purpose filler metal, it is used with all brazing processes, with some casting alloys and where limited flow is required. It is supplied in wire or rod for manual application. URSO ALU 2 and URSO ALU 22 are developped for aluminium soldering too (copper-aluminium and brass-aluminium joints). These alloys have wide use in tube joining for heat exchangers applications and automotive. URSO ALU 2 and URSO ALU 22 are supplied also fluxcored. 

SOFT SOLDERS

The primary criterion used to select the soft solder alloys is its melting properties. URSO Sn63Pb37, URSO Sn40Pb60 and URSO Sn50Pb50 are the most widely used in electronics (assembly of circuits boards) and structural applications such as the assembly of conduits for non potable water, industrial fluids, compressed gas products and vacuum assemblies.URSO Sn20Pb80 has a wider pasty range that provides greater workability. URSO Sn99,9 is suggested where lead-tin alloy are not allowed. The adding of the silver or silver-copper improves the strength and spreading and lowers the melting temperature, when compared to URSO Sn99,9. URSO Sn96,5Ag3,5 and URSO Sn95Ag5 are used extensively in plumbing applications for potable water and food handling equipments. In URSO Sn95Sb5 the adding of antimony improves monotonic and creep strength of the solder. All these soft solders must be used with flux FLOW 707, that removes the thin tarnish layers during the initial stages of the soldering process, thereby permitting the molten solder to react to substrate and to spread. 

FLUXES FOR SOFT SOLDERING

SOLDER PASTE

URSO Sn96.5Ag3.0Cu0.5 , in jars 500g

URSO Sn98.5Ag1.0Cu0.5, in jars 500g

URSO Sn99.3/Cu0.7 in jars 500g

URSO Sn62/Pb/Ag2, in jars 500g

Solder paste lead free in syringes 5 ccm; 10 ccm; 30 ccm

Stencil cleaner (STC) ;
PCB-cleaner (PCBC) (1l, 5l, 10l)
SMT adhesive 10R or 25R SC61-series
SMT adhesives are used in surface-mount assemblies on PCB to fix components to the board during wave soldering or double sided reflow. The adhesive is used to bond the Surface-Mount Device (SMD) to the PCB, in order to avoid displacement of components during high speed processes. 

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Uporablja se kot talilo in je mešanica talila, veziva in praška za mehko spajkanje. V vsakem primeru je potrebno uporabiti še mehko spajko URSO Sn97Ag3 ali URSO Sn97Cu3. Pakirano po 250g s čopičem.

Prednosti paste za mehko spajkanje Sn97Cu3-Cu-Rofix3:
Zelo dobro zapolni spajkalne reže in tako zagotavlja najboljšo trdnost
Ostanki talila se zelo preprosto odstranijo, ker so topni v hladni vodi in jih preprosto izperete skladno s

Ker omogoča jasno prepoznavanje taljenja spajke in s tem ustrezno temperaturo spajkanja, preprečuje pregrevanje cevi in armatur

RAZPOLOŽJIVE OBLIKE