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Brazing Process and Brazing Machines
When you want to purchase a brazing machine professionally or do brazing in your factory proficiently, you have to know some technical words and its terminology. It goes without saying it is almost impossible to understand technical points without knowing those words or phrases. So, we have brought some of key words and explain and describe them in an easy way.
What are differences between Brazing and welding?As you may know Brazing is a kind of welding but there are some differences. We can categorize welding, brazing and soldering in some ways from temperature point of view, base metals and process. First from point of view of temperature. For welding process, temperature is more than 700 or 800 C˚ almost, for brazing, less than 700 C˚ and for soldering less than 300 C˚. From Base metals point of view, in welding process you normally joint two same metal in metallurgical but in brazing you are also able to join permanently the parts which basically are not the same as each other in metallurgical such as iron to cupper, cupper to aluminum, stainless steel to steel and even cast iron to stainless steel. There are also differences in process for example in brazing you are able to joint parts to each other using furnace for mass production but in welding you are not able to use furnace.
base metal, Part, MaterialWhen you want to purchase a brazing machine, supplier will ask you what the parts are and what base metals are. What is really deference between part and base metal? In brazing process, a part may have one or two components (we are not referring to Alloy or made of materials here). As joints could be either lap joints or butt joints, the joints are considered important to select proper filler or method of heating.
CapillaryCapillary action makes molten filler metal moves toward the small gaps or clearness of the two parts. The small gap is filled with the molten filler metal. So, sometimes there is no need to put the filler metal everywhere there is a gap.
Forms of fillersIn Brazing Process and soldering process fillers are Rod form, ring form (washer form or wire form), ribbon form, paste form (cream form)
Types of fillersThe main types of fillers are Aluminum-silicon, Copper , Copper-silver ,Copper-zinc (brass) ,Copper-tin (bronze) ,Gold-silver and Nickel alloy but there are far more than those listed here. The percentage of material in alloy distinguishes applications of fillers in brazing process too.
FluxWhen you burn or heat something, you are making changes on chemical structures of the substance. Oxygen molecules want to react or influence on the chemical reaction. As we know oxygen is destructive in some ways and we have to prevent it. We are able to prevent it either by vacuuming the environment or an agent. In brazing process, we use both (creating vacuum mostly brazing in furnace and using agent such as flux in other process). So, flux is an agent preventing oxidation and dissolve the oxides already present on the base metal. There are two types of fluxes: white brazing flux and black brazing flux. Flux can be in form of powder, paste, liquid and coated on filler metal bras or inside of filler metal bars (flux core).
What are main points in purchasing a Brazing Machine?
The first thing you should notice, in purchasing a brazing machine, is capacity. Capacity determines which process is more suitable for your production line. For small capacity, semi-automatic machine, for medium capacity automatic such as rotary station and for big capacity and mass production, brazing furnace should be considered. It goes without saying we have to define small, medium and big quantity here and we have to consider the sizes of parts here. We define capacity here saying, less than 500 PCS per day, small capacity, less than 2000 PCS per day medium capacity and more than 3000 is considered big quantity for small parts (200x200x200 mm)
What is gas saver device in Manual torch brazing?when operators are doing brazing parts in manual torch brazing process, they may need to change positions of the parts at least in loading and uploading. While they are changing the positions or loading and uploading the parts, they do not turn off the flame as adjusting takes time. So, gas and oxygen get wasted. So, in order to save the gas and oxygen while the operators are not doing brazing, there is a device called “gas saver” save gas and oxygen. The gas saver equipped with a stopper, electrical igniter, electronic circular and solenoid valves prevents gas and oxygen wastage without need to adjust flame for every time. In order to get more idea ,please check the supplier manufacturing the gas saver as follow: