Patent ID: 8662374
Filing Date: 2014-03-04
Classification: B23K,F16L

Abstract:
1. A process for welding pipe sections together, the process comprising the steps of: a) creating a first weld between the pipe sections at a weld zone while using an inert purge gas comprising nitrogen, argon, and/or helium at ambient temperatures, b) establishing a first flow of an inert cooled gas through an interior of the pipe sections and in thermal communication with the first weld, the inert cooled gas comprising nitrogen, argon, and/or helium, c) monitoring a temperature of the weld zone, d) creating an additional weld between the pipe sections at the weld zone, e) in response to the temperature of the weld zone during step d), adjusting the temperature of the inert gas to maintain the weld junction temperature at or below a maximum interpass temperature during step d), wherein the temperature of the inert gas is from −156 degrees C. to −212 degrees C. and wherein the pipe sections at the weld zone comprise stainless steel or carbon steel.