Broken plastic frames at arm hinge. We have an exclusive repair service available for all plastic frames with metal hinges. Our laser welding service will ensure that the plastic in your frames will not melt due to the high heat required for welding. Most repairs are usually completed within 3 hours. However, some metal alloys may require additional time because the material must be quenched and prepared before attempting the welding process. Premature welding attempts without proper preparation will be unsuccessful.