Copper pipes are usually welded by oxygen, acetylene or nitrogen shielded welding. Oxygen and acetylene welding are suitable for loose connections, such as the connection between pipelines and low-pressure pipelines, copper pipe joints, under-door capillaries and static pressure plates. Nitrogen shielded welding is suitable for high-voltage components, such as condensers and evaporators.
Next, taking the welding of oxygen and acetylene as an example, the welding method of copper tube in refrigerator is introduced.
1. Cutting copper tube
When cutting the copper tube according to the demand, it should be noted that sharp edges and corners should not be left when cutting, so as not to affect the tightness of welding.
Polished copper tube
Grind the cut copper tube for connection at the joint.
3. Welding copper tube
Put the copper tube into the corrugated plate and clamp it with tools to ensure that the copper tube does not move during welding. And then welding with oxygen and acetylene. It should be noted that the copper tube should be heated uniformly at high temperature during welding to ensure the welding strength and tightness.
4. Sealed copper tube
After welding, seal it with sealant or welding material and press it by hand until the sealant or welding material is cured.
check
Carry out pressure test on the welded copper tube to check the strength and tightness of the weld.
The above is the basic process of welding the copper tube of freezer refrigeration. In addition, in practice, we need to pay attention to the following aspects:
1. In the process of copper pipe welding, the operation must be carried out according to the process requirements and cannot be changed at will.
2. In the welding process, the temperature and time must be strictly controlled to avoid poor welding caused by overheating or supercooling.
3. Before the air tightness test, pressure must be prepared to avoid the influence of insufficient pressure on the test results.
4. When cutting the copper tube, keep a sharp blade to avoid excessive damage to the copper tube when cutting.
5. After the welding is completed, use sealant or welding material for tight sealing to avoid copper tube leakage.
In a word, the welding technology of refrigerator copper tube needs to be attached great importance to ensure the standardized operation and strict implementation. Only in this way can the refrigeration effect and service life of the freezer be guaranteed.