Patent ID: 8747584
Filing Date: 2014-06-10
Classification: B29C,B29K,B29L,F16J,F16L

Abstract:
1. A method for welding ends of two separate articles or a single article to form a single welded article comprising the steps of: spacing first and second ends of one or two articles to a prescribed distance; advancing an infrared heater within said spacing between said first and second ends; energizing said infrared heater for a prescribed period of time; altering the power supplied for energizing the infrared heater over at least a portion of said prescribed period of time to achieve increased electromagnetic radiation penetration into the body of said one or more articles beyond said first and second ends; and contacting said first and second ends together to form a single welded article; wherein the step of altering the power supplied to the infrared heater further comprises the step of increasing the wavelength of said electromagnetic radiation during at least a portion of said prescribed period of time.