Ultrasonic welding is a very common plastic welding technique that can be welded quickly. Because of its fast welding characteristics, many people are concerned about whether the welding speed will have a negative impact on the welding quality. Let's briefly elaborate on this concern.
Let's first understand the working principle of the ultrasonic plastic welding machine: the ultrasonic energy is transmitted to the welding area through the upper weldment, and the sound resistance at the interface between the two welds is large due to the welding area, which is the interface between the two welds, so a local high temperature will be generated. Due to the poor thermal conductivity of plastics, they can not be dissipated in time for a while, and they gather in the welding area, causing the contact surface of the two plastics to melt rapidly, and after adding a certain pressure, they are fused into one. When the ultrasonic wave stops working, let the pressure continue, and there is a little holding time to solidify it, so that a strong molecular chain is formed to achieve the purpose of welding, and the welding strength can be close to the strength of the raw material body.
The speed at which it is welded depends on the actual application, and it can be selected as fast or slower.
The rapid welding of ultrasonic plastic welding machines usually does not have a direct impact on the quality of the product, but the rapid welding may have some indirect effects on some specific aspects.
1. Fast welding can improve production efficiency and reduce production time, but rapid heating and cooling during the welding process may have some impact on the performance of plastic materials. For example, heating and cooling too quickly can cause the plastic material in the weld area to melt inadequately, affecting weld strength and sealing performance.
2. Rapid welding may increase the stress and deformation of the welded joint, which will affect the size and shape of the product.
Therefore, when using ultrasonic plastic welding machine for rapid welding, it is necessary to comprehensively consider the quality requirements of the product, the performance of the welding material and the welding process parameters and other factors, and reasonably select the welding speed and process to ensure the welding quality.