LASER WELDING | TECHNOLOGY
Thermocomp WFC06IXP acts as the absorbing layer for laser welding. ADAS sensors is an area that Lanxess is also working in. “ADAS radar sensors and their housings in particular are an attractive field of application for our polybutylene terephthalate and polyamide compounds,” says Christopher Hoefs, ADAS expert in the company’s High Performance Materials (HPM) business unit. “We have a wide product range that meets the desired technical require- ments for this area. These include good radar transparency and dimensional stability, good laser welding behaviour and also excellent mechanical properties for fastening the sensors in the vehicle safely and durably.” PBT-based compounds that offer high hydrolysis stability in hot and humid conditions and good laser transparency for laser transmission welding are a specialty as these two material properties are said to be usually mutually exclusive. Lanxess, however, claims to have a number of PBT com- pounds that successfully reconcile the two require- ments. One example is Pocan B3233HRLT (hydroly- sis-resistant, laser transparent), which is already being used in a range of large-series applications
Above: “Black-on-black” laser welding calls for one of the two parts to appear black under visible light (top image) but transparent under IR (lower image). AF Carbon PA 950575 LT black from AF-Color meets this requirement
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