Purple copper pipe welding process, not only to choose the appropriate welding method, but also to pay attention to the optimal welding temperature, the temperature is too high or too low, will have a certain impact on the entire welding.
The optimal temperature of welding is not a layer of invariable, and the temperature of the local city, water vapor and so on have a certain relationship, after these factors are considered, the main thing to consider is the temperature of the flame.
Carbonization flame is currently used in the flame more, it is actually oxygen and ethyl gas mutual combustion, chemical reaction, it can be used as metal cutting and welding, and claimed that the white oxidized solid. When using a carbide flame for welding, under normal circumstances, it is recommended that the temperature be controlled at 2700 degrees up or down.
Neutral flames are now beginning to use less, it is characterized by the flame core of the flame is directly related to the composition in the combustion gases, flow rate and flame diameter. Neutral flame can be roughly divided into three layers, the flame core is cone-shaped, the color is white, the inner flame is blue, the overall look, is lavender to blue. The temperature of the neutral flame under normal circumstances, it is recommended to control at least 3000 degrees above, the maximum is not higher than 3400 degrees.
Oxidation flame operation requirements are very high, gradually replaced by other flames, it is the use of oxygen and ethyl block gas for flame burning, and strictly control the gas pressure at 0.5Mpa up and down, and then open the oxygen valve and ethyl block gas valve at the same time ignition, the mixing ratio of the two gases is generally based on the material, construction requirements to decide, it is not a particularly fixed take the value of the flame temperature.
Copper pipe welding precautions
First, welding is strictly prohibited tungsten electrode and wire or tungsten electrode in contact with the molten pool, this problem is a lot of builders did not notice, if there is a "tungsten" situation, copper pipe may appear in different sizes of cracks, and in severe cases, it will lead to copper pipe directly scrapped. If there is "tungsten", stop welding as soon as possible, handle and polish the copper tube, and replace the tungsten electrode as soon as possible.
Second, control the temperature. Here the control temperature refers to the interlayer temperature between the layers of copper pipe, in the formal construction, once the operator found the melting is very difficult, should increase the preheating temperature, can be carried out again on the copper pipe preheating, preheating temperature should be higher than 520 degrees. Welding in the case of temperature does not meet the requirements, it is easy to occur adverse welding reaction, directly affecting the quality of the purple copper pipe welding.
Third, mainly after the end of welding some small details, this is also the most likely to be ignored by the operator, welding arc off, the welding torch can not immediately leave or lift, to wait a little 5 minutes or so, to continue to use the lagging gas shutdown protection function to protect the solute, on the welding gun or, for the copper tube itself, are favorable.
The above three welding precautions are very small, but also construction operators are often easy to ignore.
