Method of determining the weldability of a part
First Claim
1. A method of determining the weldability of a workpiece prior to a welding process by relating weldability to the three-dimensional geometry of a molten weld pool, comprising initiating an arc between a stationary welding torch and the workpiece using a predetermined set of welding parameters to produce the molten weld pool in the workpiece;
- measuring a natural frequency of oscillation of the molten weld pool a predetermined time following initiation of the arc; and
comparing the measured natural frequency of oscillation to empirically determined data for the workpiece material to determine the weldability of said workpiece.
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Accused Products
Abstract
The weldability of a part formed from an alloy having low impurity concentrations is determined by initiating an arc between a stationary welding torch and the part using a predetermined set of welding parameters selected to produce a partially penetrating molten weld pool. The natural frequency of oscillation of the molten weld pool is measured a predetermined time following initiation of the arc, and the measured natural frequency of oscillation is compared to empirically determined data for the alloy to determine the weldability of the particular part. Variations in trace element concentrations between different heats of the same alloy affect the three-dimensional geometry of the molten weld pool, and in turn affect its resonant frequency. The invention may be used to adjust the welding parameters to accommodate differences in weldability between different heats of the same alloy.
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Citations
18 Claims
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1. A method of determining the weldability of a workpiece prior to a welding process by relating weldability to the three-dimensional geometry of a molten weld pool, comprising initiating an arc between a stationary welding torch and the workpiece using a predetermined set of welding parameters to produce the molten weld pool in the workpiece;
- measuring a natural frequency of oscillation of the molten weld pool a predetermined time following initiation of the arc; and
comparing the measured natural frequency of oscillation to empirically determined data for the workpiece material to determine the weldability of said workpiece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- measuring a natural frequency of oscillation of the molten weld pool a predetermined time following initiation of the arc; and
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16. A method of determining the weldability of a part formed of an alloy from the depth-to-width ratio of a molten welding pool in the part, comprising initiating an arc between a welding torch and the part using a predetermined set of welding parameters to produce the molten weld pool in the part;
- measuring a natural frequency of oscillation of the molten weld pool a predetermined time after initiation of the arc; and
comparing the measured natural frequency of oscillation to a set of natural frequency values for different heats of said alloy, which natural frequency values correspond to known depth-to-width ratios, to determine the weldability of said part. - View Dependent Claims (17, 18)
- measuring a natural frequency of oscillation of the molten weld pool a predetermined time after initiation of the arc; and
Specification