Cold welding and hot welding of LED display screens are two different welding methods.
They have significant differences in welding principles, processes, required conditions, and impacts on LED display screens.
The following is a detailed introduction to these two welding methods:
I. Welding principles
1. Hot welding:
- Definition: Hot welding refers to the welding of workpieces (in LED display screens, it may be LED lamp beads, circuit boards and other components) at high temperatures.
- Principle: By heating the workpiece to its melting point, the molten metal (or other materials) forms a molten pool on the contact surface, which solidifies into a weld after cooling, thereby achieving connection.
- Common methods: including gas welding, arc welding, laser welding, etc.
2. Cold welding:
- Definition: Cold welding refers to welding at room temperature or lower temperatures, and the workpiece does not need to be heated to the melting point to achieve connection.
- Principle: Cold welding usually uses physical or chemical methods (such as pressure, ultrasound, chemical reaction, etc.) to cause local plastic deformation or chemical reaction on the surface of the workpiece to achieve connection.
- Common methods: including cold pressure welding, cold spray welding, cold shrink welding, etc.
II. Welding process and required conditions
1. Hot welding:
- Process: It is usually necessary to preheat the workpiece, and then use welding equipment (such as welding gun, laser, etc.) to heat the workpiece until it reaches the melting point.
- Required conditions: A high temperature environment, welding equipment and corresponding protective measures (such as protective glasses, protective clothing, etc.) are required.
2. Cold welding:
- Process: It is carried out at room temperature or lower temperature without preheating the workpiece. The specific process depends on the cold welding method, such as cold pressure welding is to connect the workpiece surface by plastic deformation through pressure; cold spray welding is to use high-speed airflow to spray molten or semi-molten metal particles onto the workpiece surface to form a coating.
- Required conditions: Special cold welding equipment and materials (such as cold pressure welding machine, cold spray welding equipment, etc.) are required, as well as control of the operating environment (such as avoiding dust, moisture and other impurities).
III. Impact on LED display screens
1. Hot welding:
- Advantages: High welding strength, suitable for occasions that need to withstand large mechanical stress.
- Disadvantages: Due to the need for high-temperature heating, thermal damage may be caused to components such as LED lamp beads and circuit boards, affecting the performance and life of the display. In addition, hot welding may also cause problems such as thermal stress concentration and deformation.
2. Cold welding:
- Advantages: No need to heat the workpiece, avoiding problems such as thermal damage and thermal stress concentration. At the same time, cold welding has less impact on the workpiece, which is conducive to maintaining the performance and life of the display.
- Disadvantages: Compared with hot welding, the welding strength of cold welding may be slightly lower, and special equipment and materials are required. In addition, the scope of application of cold welding is relatively limited and may not be suitable for all types of LED display components.
IV. Summary
There are significant differences between cold welding and hot welding of LED displays in terms of welding principles, processes, required conditions, and effects on the display.
When choosing a welding method, it is necessary to comprehensively consider factors such as specific application scenarios, component types, and performance requirements. For occasions that need to withstand greater mechanical stress, hot welding may be more suitable; while for occasions that need to avoid thermal damage and thermal stress concentration, cold welding is more advantageous.