Why is it easy for transparent plastic to generate sparks or even burn glass when using laser welding machines?

Transparent plastics are prone to sparks and even burn pressurized glass when using plastic laser welding machine, mainly due to the combined effect of several key factors.

First, plastic laser welding is a highly concentrated energy transfer process, in which the laser beam is focused on the welding interface of the plastic, causing the plastic in that area to heat up and melt rapidly. However, if the laser parameters (such as power, focal length, etc.) are not set properly, or if the absorptivity, thermal conductivity and other characteristics of the plastic material during welding are not as expected, it may cause local overheating.

When the local temperature is too high, transparent plastic materials may undergo thermal decomposition, producing gases and volatile substances. These gases and substances expand rapidly at high temperatures. If they cannot escape in time, they will form a high-pressure state in the welding area. When the pressure reaches a certain level, it may break through the plastic surface and form sparks.

As for the burning of pressurized glass, this usually occurs in scenes where transparent plastic is in close contact with glass materials and is affected by laser welding. Due to the poor thermal conductivity of glass materials, the heat generated during laser welding cannot be quickly transferred out, resulting in a rapid increase in the local temperature of the glass surface. If the temperature exceeds the softening point or melting point of the glass, it will deform or even melt, forming a burning phenomenon.

In order to avoid these situations, it is necessary to accurately control the parameters of laser welding, such as power, focal length, welding speed, etc., to ensure that the temperature distribution during welding is uniform and controllable. In addition, for materials such as glass that come into contact with transparent plastics, appropriate insulation measures should be taken to prevent damage caused by heat transfer. At the same time, regular maintenance and inspection of welding equipment and environment to ensure that they operate in optimal conditions is also an important measure to reduce the occurrence of such problems.