Monday, November 28, 2016

Laser Solutions to the Transport and Aerospace Industry

With mounting pressure to speed production, advanced polymer thermoplastic composites are rapidly gaining acceptance amongst both the automotive and aerospace industries. These polymer materials are strong and lightweight, making them ideal for reducing weight and meeting stricter fuel efficiency and crashworthiness regulations. However, the inhomogeneous nature of composite materials is far from ideal for ablative lasers.

For example, polymer composites, by their nature, contain a variety of materials with at least one reinforcement material and at least one matrix which supports the reinforcement material. The mismatch between the conductivity of carbon fiber-reinforced polymer and the epoxy matrix makes traditional laser cutting nearly impossible. Epoxies are a type of thermoset polymer.

The challenge for laser processing involves the fact that each component has its own unique physical properties which are also highly anisotropic. Imagine a composite with two or three different melting points and how that might affect a traditional laser. These incompatibilities render traditional lasers ineffective for polymer composites.

Though challenging for the laser industry, solutions are emerging. Here's a brief overview of some of the new technologies and processes recently discussed in an article featured in Industrial Laser Solutions for Manufacturing.

Laser Solutions to Polymer Composite Challenges

Fiber Lasers - Fibers are commonly used as reinforcements due to their high surface-area-to-volume ratio and strength. Fiber lasers are emerging as the leading choice for composite processing. With a fiber laser, the beam is generated inside the fiber. With the light inside the fiber, the beam can easily and precisely be focused. Fiber lasers have the highest focusability and high average power, near infrared properties, making them suitable for cutting and welding of both metal and composite polymer materials.

Using Lasers to Improve Adhesive Bond Strength - The auto and aerospace industries also use lasers and other composite processes to improve adhesive bond strength. For example, lasers are now used to clean composite surfaces before applying adhesive bonds. Lasers eliminate the need for preparing materials for bonding with chemical or mechanical abrasion.

Localized Repair - One of the problems with composites involves localized damage. Lasers are starting to be used to repair this damage using ablation and adhesive injections. Localized repair is an emerging technique that is still being explored.

Laser Welding - According to Coherent, joining composite materials requires different approaches than when joining metal materials due to it the composite material's properties. For example, riveting can weaken or damage the composite material as discussed earlier. Laser welding becomes possible when at least one of the welding partners has a thermoplastic resin and one partner is transmissive to radiation. If the CFRP partner is a thermoset, it must be pre-processed prior to laser welding. This involves laser ablating of the reis to reveal the fiber structure. While the open fiber structure improves shear strength, it also affects absorption. Coherent recommends keeping the welding temperature constant with a pyrometer to improve weld quality.

Wednesday, November 16, 2016

Best Registry Cleaner Rating - Scan and Repair Computer

Although the registry cleaner market may seem flooded, it is possible to find a great one in the sea of faces. But be aware: there are many copies, and not all of them are equal. Many can actually create more issues for your computer. A registry holds necessary files for your hard drive to run well, and if they are removed or change, this could prevent the computer from even starting. Thus, be sure to research the best registry cleaning software rating to keep this from happening.

Whatever you do, do not download from a review site that also sells one type of registry cleaner. Many of these are spam sites with cleaners that damage your computer. Find good review sites that review more than one cleaner. An excellent option for Windows XP users is Reg Easy. This is one of the highest rated cleaners. This is great since it is designed to run well with your XP software, gently cleansing the hard drive and leaving all necessary files. A free download is available to scan and identify registry problems.The full version is also available for purchase at the Reg Easy website.

Registry Patrol is good for anyone who is a little confused by registry cleaner or wants a low maintenance program. There is very little to do except download the program (available free online) and hit the start button. The automated program will fix your computer with no hassle. It is a proven program that will not damage your computer. A completely free and well done option is using Free Registry Cleaner. It is simple but effective. Since it is free, it is worth a try.

There are many options for those looking for a best registry cleaner rating. If your computer is running very slowly and having difficulty opening web pages, you probably need to get a cleaner. Many times just running a cleaner will take care of your computer's problems.