How to weld the interface between copper pipe and iron pipe
Did the refrigerator repair are: welding of copper and iron keenly aware of the hard interface. You have a good test section pressure, connect the system on the OK, I planted the iron brazing mouth, sometimes a few hours later, no welding is not too good, accidentally put a high-pressure pipe compressor can also get a paste. So, how do you solder the copper and iron interface? The following describes experience of copper and iron welding interface, the main interface is a problem for welding of copper and iron on iron copper silver electrode affinity is not enough, roasted red iron solder is not sticky after iron, some borax may be better, but it is easy to form a leak.
Know a little knowledge of welding the users know that in fact the iron phosphorus brazing affinity is very good, very beautiful mirror can be formed with borax when phosphorus brazing soldering iron. But the iron and the melting point of copper is not the same, we use copper tube and pipe welding interface, you will find that when the temperature rises to pipe can dissolve phosphorus brazing, copper has reached the melting point.
If you lower the temperature, you can easily get a beehive. What shall I do? In fact, we change a way of thinking on the line, I do: first the need for welding pipe with sandpaper clean, and then use the stick phosphorus brazing of Borax in place from the mouth of 1cm thin welding lap, attention must not leak welding. The high places of work. With a file, with sandpaper polished and clean the welding flux; the brass pipe of course is not easy to go into the tube, and this can be used to expand the reamer copper tube, the iron pipe into the tube; now we can be like a kind of welding brass with silver brazing welding the interface of copper and iron, as iron had been welded on the copper interface, the roasting temperature, we will find the welding wasn't difficult at all.
