Brazing & Soldering Products

solderingBrazing & Soldering Products
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers.  Electronics Soldering Flux: If you`re soldering printed circuit boards (PCB`s) or doing wire or component lead tinning, semi-conductors or component lead tinning, you belong in this section. Welding Flux: As with the other categories, welding is broken down according to application. Our Anti-Borax Fluxes division has been selling welding flux to blacksmiths for over a century. Sometimes a phone conversation or e-mail is all it takes for us to identify the right flux.Copper brazing alloys are well known for their excellent resistance to corrosion and high electrical and thermal copper conductivity.  In some cases we ask customers to send us components, and we experiment with them in our laboratory to determine the optimum metal joining process. Often we not only recommend which flux to use, but make recommendations on solder alloy, base metal and the actual metal joining process. We have a lot of experience with metal joining and are happy to offer our expertise.The brazing of copper, and in particular oxygen-free copper in a vacuum is a relatively trouble-free process when compared to some of the more difficult-to-braze materials such as the refractory metals, but nonetheless there are still some basic brazing principles which should be followed as a matter of best practice. It is also not uncommon for us, depending on the application and location, to send a metal joining specialist to your factory floor to analyze your specific metal joining process for the purpose of recommending a flux solution. We also offer Flux Consulting and Lab Services in which we provide in depth professional analysis of your metal joining processes at your site or professionally analyze your joining or tinning applications in our laboratory. A major advantage of brazing is the ability to join the same or different metals with considerable strength.For many years the two most common methods of joining copper tube and fittings have been soldering and brazing.  These Terms of Use govern Your use of the Web Site and all applications, software and services (collectively, Services”) available via the Web Site, except to the extent such Services are the subject of a separate agreement. Bluewater may also change or impose fees for products and services provided through the Web Site at any time in its sole discretion. Bluewater may establish or change, at any time, general practices and limits concerning other Bluewater products and services in its sole discretion. Accessing the Web Site or Services after such termination, suspension or discontinuation shall constitude an act of trespass.Last issue, one brewer presented a brief overview of options for welding stainless steels.  Further, You agree that Bluewater shall not be liable to You or any third party for any termination or suspension of Your access to the Web Site and/or the Services. Services” means the thermal processing and/or other services performed by Bluewater Thermal Services (BTS”) to the customer ordering or requesting such Services (the Customer”). Goods” means any products of Customer upon which BTS has performed or will perform the Services in accordance with the terms of an Order.
The filler metal flows into the gap between close-fitting parts by capillary action The filler metal is brought slightly above its melting ( liquidus ) temperature while protected by a suitable atmosphere, usually a flux It then flows over the base metal (known as wetting) and is then cooled to join the work pieces together. A variety of alloys are used as filler metals for brazing depending on the intended use or application method.The filler metal for a particular application is chosen based on its ability to: wet the base metals, withstand the service conditions required, and melt at a lower temperature than the base metals or at a very specific temperature. Ammonia (AWS type 5, also called forming gas ): Dissociated ammonia (75% hydrogen, 25% nitrogen) can be used for many types of brazing and annealing.For brazing copper, brass, nickel alloys, Monel, medium and high carbon steels and chromium alloys. Nitrogen+hydrogen, cryogenic or purified (AWS type 6A): 70-99% N2, 1-30% H2. For copper, silver, nickel, copper-phosphorus and copper-zinc filler metals. There are three main categories of torch brazing in use: 10 manual, machine, and automatic torch brazing.For brazing copper, brass, nickel alloys, Monel, medium and high carbon steels and chromium alloys, cobalt alloys, tungsten alloys, and carbides. For brazing copper, brass, nickel alloys, Monel, medium and high carbon steels chromium alloys, titanium, zirconium, hafnium. It is best used in small production volumes or in specialized operations, and in some countries, it accounts for a majority of the brazing taking place.Torch brazing of copper can be done without the use of flux if it is brazed with a torch using oxygen and hydrogen gas, rather than oxygen and other flammable gases. Machine torch brazing is commonly used where a repetitive braze operation is being carried out. This method is a mix of both automated and manual operations with an operator often placing brazes material, flux and jigging parts while the machine mechanism carries out the actual braze. It is common to use either controlled atmosphere or pre-applied flux in continuous furnaces.
The use of flux is also required for this method as there is no protective atmosphere, and it is best suited to small to medium production volumes. There are four main types of furnaces used in brazing operations: batch type; continuous; retort with controlled atmosphere; and vacuum. Vacuum brazing is also used heavily with refractory materials and other exotic alloy combinations unsuited to atmosphere furnaces. Due to the absence of flux or a reducing atmosphere, the part cleanliness is critical when brazing in a vacuum. The method uses a silver- and flux-containing brazing pin, which is melted in the eye of a cable lug.Typical vacuum levels for brazing range from pressures of 1.3 to 0.13 pascals (10−2 to 10−3 Torr ) to 0.00013 Pa (10−6 Torr) or lower. Silver brazing, sometimes known as a silver soldering or hard soldering, is brazing using a silver alloy based filler. These silver alloys consist of many different percentages of silver and other metals, such as copper, zinc and cadmium. Braze welding is the use of a bronze or brass filler rod coated with flux to join steel workpieces.One special silver brazing method is called pinbrazing or pin brazing It has been developed especially for connecting cables to railway track or for cathodic protection installations. The equipment needed for braze welding is basically identical to the equipment used in brazing. Vacuum brazing is a material joining technique that offers significant advantages: extremely clean, superior, flux-free braze joints of high integrity and strength. The process can be expensive because it must be performed inside a vacuum chamber vessel.Vacuum brazing is often conducted in a furnace; this means that several joints can be made at once because the whole workpiece reaches the brazing temperature. Dip brazing is especially suited for brazing aluminum because air is excluded, thus preventing the formation of oxides. The parts to be joined are fixtured and the brazing compound applied to the mating surfaces, typically in slurry form. Some brazing applications require the use of adequate fluxing agents to control cleanliness.Then the assemblies are dipped into a bath of molten salt (typically NaCl, KCl and other compounds), which functions as both heat transfer medium and flux. One of the main disadvantages is: the lack of joint strength as compared to a welded joint due to the softer filler metals used. At above 40% Zn the ductility and strength drop, so only lower-zinc alloys of this type are used. This allows diffusion brazing, and lets the joint be used above the brazing temperature.