IF welding machine mainly controls the core size through welding time. When other welding parameters remain unchanged, the longer the welding time, the larger the core size.
In occasions where welding strength is required, a relatively large welding energy and a relatively short welding time should generally be chosen. It should be noted that increasing the welding time will increase the energy consumption of welding machine , and it will also increase the wear of the electrode and reduce the service life of the equipment.
Prepressure time refers to the period from the time the foot switch gives the signal, the cylinder starts to be pressed to the power supply for welding. The principle is that the cylinder presses the workpiece and the gas source pressure rises to the set value and enters the welding time.
Factors affecting the prepressing time include the length of the cylinder's action stroke and the movement speed of the cylinder's . If the prepressing time is too short, it may be possible that the welding may be turned on when the pressing is not tightened, causing burning of the welding electrodes and workpieces, and the welding quality cannot be guaranteed. If the pressing time is too long, it will reduce the production efficiency and even cause deformation of the workpiece.
Maintenance time refers to the period from the period from the time the cylinder is lifted and reset after welding is completed. Since the newly formed melting core needs to be pressurized for a period of time, it is also possible to apply a pressure greater than the pressure during welding to the workpiece that has just been welded. The period when the pressure is increased is the forging time, and the maintenance time without changing the pressure time is the maintenance time. This time is generally not very strict in terms of welding process, as long as the welding strength can be met, it is enough. The maintenance or forging time of spot welding process is generally controlled at about 0.1 to 1 second.
