display cases Welding rod and flux
display cases Welding rod and flux
When welding the pipelines of display cases, welding rod and flux are indispensable auxiliary materials. At present, the commonly used electrodes for welding display cases are mainly copper-phosphorus electrodes, copper-silver electrodes, and copper-zinc electrodes. When welding the pipeline, it is necessary to select electrodes of different materials according to the material of the welding pipeline. For example, if the pipes to be welded are all copper pipes, it is best to use copper-phosphorus welding rods; if the copper pipes are welded to pipes of other materials (such as steel pipes), it is best to use copper-silver welding rods. Use flux. The function of the flux is to generate slag from the metal oxide or non-metallic impurities on the weldment during the welding process, and to cover the surface of the weld to isolate the air, thereby enhancing the quality of the welding.
The three-way inspection meter valve must be used when evacuating the
display cases, charging refrigerant, and measuring pressure. It is mainly composed of a one-way valve and a pressure gauge. The interface 1 of the three-way valve has threads for installing the pressure gauge; the interface is connected to the refrigeration system of the display cases: the interface 3 is used to charge nitrogen during maintenance. Connect with the vacuum pump to vacuum the system and allow refrigerant injection. When the control valve is closed, the interface 3 is in the closed state, and the interface 1 and the interface 2 are still connected. At this time, the pressure changes in the refrigeration system can be monitored at any time, which is very convenient to use. The maximum range of the pressure gauge is generally 2.5MPa to 2.8MPa, and the negative pressure is 0~0.1MPa.
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