Automatic system for abrasive hardfacing
First Claim
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1. A method for making a hardfacing layer on a metal surface of a workpiece, the method comprising the steps of:
- a) welding an iron-based filler metal to the metal surface of the workpiece by gas metal arc welding, thereby generating a weld pool, the filler metal being used as an electrode in a welding gun;
b) feeding a plurality of carbide particles towards the weld pool with a particulate delivery system;
c) moving the workpiece with respect to the welding gun, the workpiece being moved so as to trace an oscillatory path having a predetermined frequency and amplitude of oscillation, the frequency of oscillation being from 4 Hz to 10 Hz.
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Abstract
Arc welding systems, apparatus and methods are for hardfacing are provided, including particle feeding apparatus. In one aspect the workpiece is moved in an oscillatory fashion while keeping the welding torch and the particulate delivery system stationary during at least a portion of welding pass. The welding torch and particulate delivery system may also be moved in a non-oscillatory fashion. Process speeds of about 18-30 in/min can be obtained with carbide incorporation of greater than 30% and uniform distribution.
66 Citations
24 Claims
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1. A method for making a hardfacing layer on a metal surface of a workpiece, the method comprising the steps of:
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a) welding an iron-based filler metal to the metal surface of the workpiece by gas metal arc welding, thereby generating a weld pool, the filler metal being used as an electrode in a welding gun; b) feeding a plurality of carbide particles towards the weld pool with a particulate delivery system; c) moving the workpiece with respect to the welding gun, the workpiece being moved so as to trace an oscillatory path having a predetermined frequency and amplitude of oscillation, the frequency of oscillation being from 4 Hz to 10 Hz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for making a hardfacing layer on a metal surface of a workpiece, the method comprising the steps of:
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a) welding an iron-based filler metal to the metal surface of the workpiece by gas metal arc welding, thereby generating a weld pool, the filler metal being used as an electrode in a welding gun; b) feeding a plurality of carbide particles towards the weld pool with a particulate delivery system; c) moving the workpiece with respect to the welding gun the workpiece being moved so as to trace an oscillatory path having a predetermined frequency and amplitude of oscillation, wherein the oscillatory path is a weaving path having a primary weld direction and the workpiece is moved at a lateral travel speed defined along the primary weld direction, wherein the frequency of oscillation is from 4 Hz to 10 Hz, the amplitude of oscillation is from 1 mm to 10 mm, and the lateral travel speed is from 10 ipm to 40 ipm. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification