Purple copper tube is widely used in the industry's major fields, purple copper tube welding process many times will directly affect the use of purple copper tube, exactly which welding is the most appropriate, we have to do a simple inventory.
(1) Electromagnetic welding
In the absence of external pressure is applied, the weld out of the base metal for high-temperature melting, and then welded. Electrofusion welding is the use of the heat source of the heated part of the joints of the welded parts without pressure to fuse with each other, cooling and solidification will form a solid joint.
Electrofusion welding can be divided into: electrode arc welding, submerged arc welding, fusion electrode gas shielded welding, screw fusion electrode column welding and so on. Currently in the industrial field is widely used, and the operation is fast, the cost is slightly higher!
(2) brazing
Brazing and electric welding principle is very close, brazing will often be used than the melting point of the base material 20 degrees or even 50 degrees lower than the metal material for brazing material, the material to be welded heated to a certain temperature, the temperature is lower than the melting point of the base material temperature, and then use the liquid brazing material to wet the base material, so as to achieve it in the gap between the continuous welding.
(3) Pressure welding
Before welding, the weldment should be heated, and in some cases, it is pressurised. Pressure welding can be divided into resistance welding and cold pressure welding, both of which are more widely used, for the higher technical requirements will be used resistance welding. The advantage of pressure welding is that the two combined surfaces of each other, after welding will be tightly combined, there will rarely be gaps.
Copper pipe welding process in recent years began to gradually promote to the intelligent, using pure mechanical equipment to partially replace the manual operation has been gradually achieved.
Copper tube quality identification
(1) Look at the colour and lustre
Currently on the market the better refrigerant copper tube is purple copper tube, in the air conditioning, home decoration, and even industrial production is also the most used. The general provisions of the purity of the purple copper pipe in 99% or more, known as pure copper, which presents a rose-red colour. Some purple copper pipe presents the colour is partial rusty, then the quality of this purple copper pipe is poor.
Other copper pipes on the market are mostly alloy copper pipe, such as brass pipe, by 7.2:2.8 copper-zinc ratio synthesis, the colour will show yellow.
(2) Hand feel
Good quality purple copper pipe feel smooth, and no cracks, bumps and other such cases, and no sand holes, no oxidation rupture and other defects.
(3) Bending copper pipe
Good quality copper is not easy to bend, there is a certain toughness, which is the chemical properties of copper. But after the addition of other chemical elements to the copper pipe, after bending, there are significant traces, and even colour differences.
(4) Processing technology
Now the production of copper pipe is mainly divided into extruded process copper pipe and tensile copper pipe. Extruded copper tube wall is relatively thick, and from the top to the bottom, the thickness is relatively uniform. The wall of the stretched copper tube is not as uniform as the extruded one, the wall is not uniform, and the centre of the long copper tube is relatively thin, which is also a normal phenomenon.
When running with R410A refrigerant, stretching type copper pipe wall thickness at the weak spot is easy to burst.
(5) Purchase way
General selection of purple copper pipe, we will choose the local more famous, large-scale production enterprises, try to avoid small-scale production enterprises, the same batch price is particularly low enterprises are not recommended for purchase. We can learn more about the source of copper, which is directly related to the quality of good and bad.
