Location

La Jolla, CA

Start Date

1-1-1989 12:00 AM

Description

The use of ultrasonic sensors to detect discontinuities associated with the molten pool is one phase of a project to automate the welding process [1]. In this work, ultrasonic sensors were used to interrogate the region around the molten/solid interface during gas metal arc welding (GMAW). The ultrasonic echoes from the interface and the molten pool provide information about the quality of the fusion zone and the molten pool. This information can be sent to a controller that can vary the welding parameters to correct the process. Previously ultrasonic shear waves were used to determine if the geometry of the molten/solid interface was indicative of an acceptable weld [2,3]. In this work, longitudinal waves were used to interrogate the molten weld pool for discontinuities. Unacceptable welding conditions that can result in porosity, incomplete penetration, or undercut were detected.

Volume

8B

Chapter

Chapter 9: Characterization of Materials

Section

Process Control

Pages

2181-2187

DOI

10.1007/978-1-4613-0817-1_277

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Process Control of GMAW by Detection of Discontinuities in the Molten Weld Pool

La Jolla, CA

The use of ultrasonic sensors to detect discontinuities associated with the molten pool is one phase of a project to automate the welding process [1]. In this work, ultrasonic sensors were used to interrogate the region around the molten/solid interface during gas metal arc welding (GMAW). The ultrasonic echoes from the interface and the molten pool provide information about the quality of the fusion zone and the molten pool. This information can be sent to a controller that can vary the welding parameters to correct the process. Previously ultrasonic shear waves were used to determine if the geometry of the molten/solid interface was indicative of an acceptable weld [2,3]. In this work, longitudinal waves were used to interrogate the molten weld pool for discontinuities. Unacceptable welding conditions that can result in porosity, incomplete penetration, or undercut were detected.