Due to the use of low-power ultrasonic welding machine, many people will adjust the pressure greatly and take a long time when debugging the ultrasonic machine, because they are worried that the welding is not firm, which just aggravates the deformation of the product.

The solution is: use a high-power ultrasonic welding machine, the power is large, the amplitude is strong, and complete the welding with less pressure and shorter welding time, so that the product will not deform.

Welding deformation certainly exists. The normal deformation is about 2-4 wires. The deformation caused by different materials and the structure of welding tooling is also different. The deformation of the product must be caused by the pressure of the ultrasonic equipment or the plastic wall of the product is too thin to bear large pressure. In short, it can be improved by adjusting the parameters of the ultrasonic welding machine and the liner ultrasonic fixture.

If the welding deformation is too large and the size difference before and after welding is too large, the tightness of tooling shall be considered. Generally speaking, we believe that the reason why the total length and width become larger after welding is that the tooling base is too loose; The total length and width become shorter after welding because the tooling base is too tight. In addition, excessive drop pressure of the welding head will also aggravate the deformation.

Therefore, no matter what kind of deformation, first reduce the welding pressure to an appropriate value. If the size is too large after welding, stick some thin tin foil at the limit of the tooling base to tighten the positioning; If the size is too small after welding, grind loose the tight position of the tooling, and do not pad thick film during welding.