In laser plastic welding, the light transmission of the plastic is decisive for the quality of the joint between two components. A check of the material properties before welding really pays off in the context of the overall quality assurance process. With the TMG 3 calibrated measuring device from LPKF, the user is on the safe side.
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Transmission welding or laser transmission welding also goes by a few other names, including: laser plastic welding, through-transmission welding (TTLW) and laser polymer welding. The names may be different but the concept is all the same.
Although, “laser plastic welding” is the term most often used to describe this technology, “transmission welding” is a much more descriptive term and more accurately portrays the process. This is because the basic principle of this joining method is passing, or transmitting, laser radiation through one piece of plastic to create a weld. Unlike standard welding where the energy is applied at the surface of the materials. Transmission welding aims to apply the energy in between two plastic pieces at their interface.
If you are familiar with laser plastic welding you understand that the upper layer needs to be transparent to the radiation and the lower layer absorbent to the same radiation.
The majority of thermoplastics transmit common laser welding wavelengths in their natural state, but a variety of factors influence the level of transmittance, including: thickness of the plastic, fillers (glass or fiber), flame retardants and color additives.
This article will focus specifically on how color affects the process.
We are currently developing educational content (webinars/case studies) for laser plastic welding. What topics would you like to see covered?
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Quality control is a main factor in the development and manufacture of any new product. From pre-production testing to in-line process monitoring, control mechanisms often drive much of the process of bringing a product from concept to production.
A powerful document for engineers designing applications for laser plastic welding. Covers the main factors affecting a quality weld, material considerations, process types and more.
The LQ-Power is a stand-alone welding system. Designed for production use, the Power is a workhorse. Designed slightly larger than other stand-alone units the Power is capable of making use of all of the technologies and capabilites available to welding systems, including: pyrometers, reflection diagnosis systems, larger optics sets (larger scan fields) and camera-assisted vision systems.
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