Welding process of evaporator condenser copper tube elbow

Preheat:
Use the welding gun or welding machine to preheat the welding part, increase the temperature of the welding area, and reduce the welding stress.
Welding operation:
Select the appropriate welding parameters (such as temperature, time, pressure, etc.) according to the welding method (such as brazing, fusion welding, etc.).
The welding wire is dipped in an appropriate amount of flux and sent to the welding site, and the heat generated by the welding gun or welding machine is used to melt and fuse the welding wire and copper tube together.
Pay attention to control the welding temperature and time to avoid excessive heating resulting in copper tube deformation or welding defects.
Weld treatment:
After welding, wipe the weld surface with a damp cloth or special cleaner to remove residual flux and oxide.
Check the quality of the weld, ensure that there are no cracks, pores and other defects in the weld, and make necessary repairs.

Quality control

Appearance inspection:
Check whether the appearance of the weld is smooth and smooth, without cracks, pores and other defects.
Check whether the welding part is firm and reliable, no loosening or leakage phenomenon.
Tightness test:
Use nitrogen or refrigerant to pressure test the welding parts to check whether the welding parts are properly sealed.
If there is leakage, it should be repaired and re-tested in time.
Performance test:
After the system installation is completed, the overall performance test is carried out to ensure that the welding process of the evaporator condenser copper tube elbow meets the design requirements and the system operation requirements.