FAQ

The parameters that affect the quality of solder joints for intermediate frequency DC spot welding opportunities are: 

1. Preload time; 

2. Slow rise time: 

3. One welding time:

4. Primary current: 

5. Primary cooling time 

6. Secondary welding current: 

7 、Secondary welding time; 

8.Secondary welding current 

9. Slow down time; 

10. Maintain pressure holding time.

Pre-pressure time, this stage includes two parts: electrode pressure rise and stability. In order to ensure that the electrode pressure is constant when the spot welder is energized, the preload time must be guaranteed, especially for continuous spot welding, the time required for the action of the welder’s motion mechanism must be fully considered, and it cannot be shortened indefinitely.

When multi-point welding, in order to ensure that the pressure of each welding machine is uniform and the welding current passed through, the pre-compression time should be correspondingly longer. The heating principle of the welding current root insulation resistance knows that the heat generated by the resistance is proportional to the square of the current. The magnitude of the current affects the efficiency of heat generation, and the density of the current is also very important.

Under a certain pressure, the surface state of the welding material directly determines the size of the contact resistance, that is, the small unevenness and oxide film on the surface of the metal welding material will have a great impact on it: the small unevenness is conducive to achieving the desired The resistance heating effect, but the oxide film will increase the resistance, causing the local heating to be too high and need to be removed.