Method of welding nickel-aluminide

摘要

A method for gas tungsten arc welding (GTAW) of nickel-aluminide is provided. The method includes machining a weld groove having a width from 1 to 2 mm on an outer surface, a weld groove angle with a vertical being less than 30°; and a root face being not longer than 3 mm. During welding, a measured temperature 30 cm (12″) from a weld torch and 3 mm from the weld groove edge should not exceed 200° C.; and an interpass temperature should be less than 85° C. measured at 3 mm from the weld groove edge. With exception of the root pass, all filler and cap pass layering should start from the nickel-aluminide edge, each bead should be peened; and the weld cap pass should overlap on the nickel-aluminide surface edge by at least 3 mm. The weld bead layout at the nickel-aluminide edge should be laid at torch angle less than 30°, and the weld heat input should be in the range of 17 to 23 kJ/in. The linear welding speed is greater than 8.6 cm/min and a deposition rate should be greater than 3.0 cm3/min.

主权项

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 cm3/min or more.