Welding assessment
AssigneeThe University of Sydney
InventorStephen Walter Simpson
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Abstract
An apparatus and process for determining whether a fault has occurred in a welding process while the process is under way. The invention is applicable to welding and cutting processes where there is an arc plasma, such as gas-metal arc welding, tungsten-inert gas welding, pulsed welding, resistance welding and submerged welding. It involves sampling welding voltage and welding current to provide first and second signals, generating artificial third signals from these dependent on values of the first and second signals through generalised discrete point convolution operations, identifying corresponding values as triplets and collecting triplets of values into groups or regions.
Claims36
An apparatus for on line welding assessment, comprising:
- first sampling means to sample the welding voltage or current to provide a sequence of values for a first signal,
- second sampling means to sample the welding current or voltage to provide a sequence of a values of a second signal,
- a signal generating means to generate one or more sequences of values for one or more artificial third signals from the first signal and second signals where the artificial signals depend upon values of the first and second signals through generalised discrete point convolution operations,
- tripling means to identify corresponding values of the first, second and third signals as triplets, and
- collection means to collect triplets of values which are useful for quality monitoring into groups or regions.
A method for on line welding assessment, comprising the following steps:
- sampling the welding voltage or current to provide a sequence of values for a first signal,
- sampling the welding current or voltage to provide a sequence of a values of a second signal,
- generating one or more sequences of values for one or more artificial third signals from the first signal and second signals where the artificial signals depend upon values of the first and second signals through generalized discrete point convolution operations,
- identifying corresponding values of the first, second and third signals as triplets, and
- collecting triplets of values into regions which are useful for quality monitoring.
Dependencies are inferred from the claim text.