Welding
Process > Welding
Welding | ||
Mechanical seals, adhesives and welding processes are used to form joints between plastics. Mechanical seals provide a fast connection, but little resistance to leakage and localized stresses can cause material detachment. The adhesives, on the other hand, can provide solid bonding properties, but sometimes they are difficult to handle and have a slow cure. In addition, they require a prior preparation of the surface to ensure good results. In contrast, welding is used to produce joints with mechanical properties similar to those of the original material with excellent strength, strength and shelf life. The welding of plastics can be divided into processes involving mechanical movement (ultrasound, friction, vibration) and those involving external heating (hot plates, hot gas and laser). Find in this article a brief description of the most used methods, as well as a glimpse of some of the novelties in the market that allow to modify the design of parts, contribute to reduce the cost of tooling in processes such as injection and also reduce the consumption of supplies such as adhesives and subsequent assembly processes. For more information about our welding machines contact us at the following email: tech@mexpolimeros.com | ||
Welding techniques | ||
In general, the different ways of joining plastic pieces by welding can be grouped into four large blocks: By the contribution of heat from an external heating element: a technique that is intended for thermoplastics that, due to the increase in temperature, melt, being able to join by compression the molten surfaces; By emission of high frequency and ultrasound: a method that consists of emitting waves of a certain frequency in the surfaces to be joined, generating a vibration effect between the molecules of the material, which causes an increase in temperature and softens it. By emission of laser beam: a system that is reserved for joining small pieces in certain areas, emitting a laser beam that heats the surface to be welded; By vibration: a highly reliable process that allows you to handle large pieces of demanding materials or multiple pieces per cycle with ease. Another technique of welding of plastics that could be mentioned, which is used at both industrial and domestic levels, is chemical welding using solvents. |