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What is brazing process

Soldering process, soldering process is to use with low melting point metal with high melting point metal, lower than the parent metal filler metal, namely solder, after heated to melt, using liquid solder wetting parent metal, and then fill the gap between joint, and parent metal diffusion, to realize the connection of a welding method. So what's the use of brazing?


In fact, in addition to the soldering process, there is a kind of fusion welding process, vacuum heat treatment furnace brazing process at work, solder will melt, and weldment won't melt, the welding temperature with the different choice of solder, and at room temperature to nearly the parent metal melting temperature range of constant change. When soldering, welding is often a whole heating or brazing seam around a wide range of uniform heating, so the relative distortion of welding and brazing welding head to much smaller than welding residual stress, so it is easier to ensure welding precision of size.


There are many heating methods, including flame heating, impregnating heating, heating of soldering iron, resistance heating, heating in furnace and induction heating etc.


vacuum brazing furnace.jpg


The process of brazing process is as follows:


1、cleaning before welding, welding, the first thing to remove the surface of the weldment and its joint oxide, clutter, and oil, heat wire and aluminum plate surface also have to be clean with a clean piece of, this will increase the welding surface coarse paste, allows it to increase after welding joint together.


2、besmear brushs flux, flux and water in the first place made into paste, and then applied to the aluminum plate, want to have a layer of evenly and cannot have tuned powdered flux, solder on the besmear after waiting.


3、 Upper solder: put the heat pipe and aluminum plate in order, and then apply the solder evenly to the heat pipe and the welding surface of the aluminum plate. Install the aluminum plate and heat pipe in the predetermined position of the base and wait for welding. When assembling the heat pipe, you should pay attention to the position, and you can't have a deviation.


4、welding cooling: after preheating heat pressure, complete welding on brazing machine, at the time of welding should pay attention to control welding of pressure, temperature, heating and the preheating time, after welding, make its natural cooling.


Vacuum aluminum brazing.jpg


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