Copper tube welding technique

When welding copper pipes, the following tools should be used:

Welding gas or wind stone – Gas (stone: C2h2 acetylene, Wind: oxygen, gas: ordinary gas)
– Borax
– Silver soldering iron (low melting point, easy to spread, easy to stick)
– Silver soldering iron (low melting point, easy to stick, very easy to flow)
– Files and sandpaper.

How to weld copper pipes:

– Use wax and sandpaper to clean the surface to be welded and sanded.
– Use a welding torch for hot welding, dot less welding on the surface to be welded to clean.
– Incorporate the welding rod into the welding position.

Often when welding copper pipe with oxygen, the fire will catch evenly and the temperature is stable. But when welding with torches will cause flickering fire to irregular hot copper pipes.

If you make the first copper pipe joints are hot to the standard and then connect the copper pipe together. For the welding torch until you see the joints are reddish in color tomatoes, the welding rod to fill the welding joints! Do not allow the weld to stick to the position is too high.

An extremely important thing in cold-drawn copper pipes is to clean the tube after welding. To ensure no soot is trapped inside the tube after welding, use nitrogen gas to blow through the copper pipe during welding to clean the tube.

Incident in copper tube steam welding is mainly due to the explosion of oxygen cylinders, the cause may be due to C2h2 or gas running back towards the oxygen bottle then hit the fire. Therefore, in order to ensure safety, it is necessary to ensure that the excess pressure in the oxygen bottle is not exhausted. Burning to the gas or acetylene bottle burns to the end of the bottle valve.

At the end of the welding process, it is necessary to turn the oxygen valve down until the flame fires and then turn off the fuel valve (the flame emits a beep), then turn off the oxygen valve. For small welding nozzles, the valve is closed and the oxygen valve is closed. The goal is not to let oxygen pressure be less than the fuel pressure.