Patent ID: 9623509
Date: 2017-04-18
CPC Classifications: B23K

Claim:
1. A method for gas tungsten arc welding (GTAW) of nickel-aluminide to itself or other nickel-based alloys using a filler wire, comprising the steps of: machining a weld groove having a width from 1 to 2 mm on an outer surface of the nickel-aluminide, an angle of the weld groove with a vertical being 30° or less and a root face being 3 mm or less; during welding, measuring a temperature 30 cm (12″) from a weld torch and 3 mm from a weld groove edge, the temperature being 200° C. or less, and measuring an interpass temperature 3 mm from the weld groove edge, the interpass temperature being 85° C. or less; starting from a nickel-aluminide edge, layering all filler and cap pass, with the exception of a root pass, peening each bead, and overlapping the weld cap pass on the nickel-aluminide surface edge by at least 3 mm; and laying a weld bead layout at the nickel-aluminide edge at a torch angle of 30° or less, the weld heat input being from 17 to 23 kJ/in; a linear welding speed being 8.6 cm/min or more and a deposition rate being being 3.0 cm