A spot-welding electrode assembly includes an electrode, an electrode cap at an outer end of the electrode, and a plurality of transducer elements positioned inward of the electrode cap. The transducer elements may be micro-elements. A method for monitoring a weld formed by a spot-welder includes passing current from an electrode assembly through a stack-up, transmitting an ultrasonic wave from each of a plurality of sources in the electrode assembly to a plurality of points in the stack-up, and monitoring the ultrasonic waves to monitor the weld formation.

A device including a reservoir filled with fluid, a frame, and a resilient rolling seal to prevent the fluid from reservoir from escaping, even while the device is moved along a surface. The purpose of this device is to deploy a sensor which is housed within the reservoir. The device is thus capable of maintaining a reservoir of fluid around a sensor or probe and allow the sensor or probe to remain immersed in the fluid, while also remaining in contact with the surface in which the device is moved along. The sensor preferably resides in a fluid couplant of the device. Because the fluid and the sensor reside in the reservoir and because that reservoir is effectively sealed, there is very little loss of fluid, and the amount of fluid needed to conduct testing is dramatically decreased.

A device including a reservoir filled with fluid, a frame, and a resilient rolling seal to prevent the fluid from reservoir from escaping, even while the device is moved along a surface. The purpose of this device is to deploy a sensor which is housed within the reservoir. The device is thus capable of maintaining a reservoir of fluid around a sensor or probe and allow the sensor or probe to remain immersed in the fluid, while also remaining in contact with the surface in which the device is moved along. The sensor preferably resides in a fluid couplant of the device. Because the fluid and the sensor reside in the reservoir and because that reservoir is effectively sealed, there is very little loss of fluid, and the amount of fluid needed to conduct testing is dramatically decreased.

The present invention relates to an ultrasonic testing apparatus with a variable frequency, which can automatically change the frequency according to thickness and thereby detect internal defects in objects having various thicknesses. The ultrasonic testing apparatus may comprise: a nozzle jetting a medium toward an object so as to form a medium column; and a plurality of probes disposed in the nozzle so as to generate ultrasonic waves.

The present invention relates to an ultrasonic testing apparatus with a variable frequency, which can automatically change the frequency according to thickness and thereby detect internal defects in objects having various thicknesses. The ultrasonic testing apparatus may comprise: a nozzle jetting a medium toward an object so as to form a medium column; and a plurality of probes disposed in the nozzle so as to generate ultrasonic waves.

An ultrasound probe assembly comprises a housing and a wedge, wherein wedges configured for pipes of different diameter may be easily interchanged in the assembly. Four wheels are attached to the housing, there being a front wheel pair and a rear wheel pair. Wheels of each pair are positioned on either side of a linear probe array, wherein the distance between wheels in each pair in a direction perpendicular to the array length is as small as possible. A position encoder monitors the position of the assembly during scanning, and a push lock switch is used to disable the encoder and the data acquisition while indexing to a new scan position on the pipe.

An ultrasound probe assembly comprises a housing and a wedge, wherein wedges configured for pipes of different diameter may be easily interchanged in the assembly. Four wheels are attached to the housing, there being a front wheel pair and a rear wheel pair. Wheels of each pair are positioned on either side of a linear probe array, wherein the distance between wheels in each pair in a direction perpendicular to the array length is as small as possible. A position encoder monitors the position of the assembly during scanning, and a push lock switch is used to disable the encoder and the data acquisition while indexing to a new scan position on the pipe.

An apparatus for performing ultrasonic evaluation of a portion of a pipe includes a frame assembly and a plurality of ultrasonic sensors disposed in the frame assembly. The frame assembly includes a frame which is structured to cooperatively engage an outer surface of the pipe. The frame has a curved surface which is curved about an axis which, when the frame is engaged with the pipe, generally coincides with the central longitudinal axis of the pipe. The curved surface is generally defined by a radius which is generally equal to an outer radius of the pipe. The plurality of ultrasonic sensors are disposed in the frame assembly a fixed distance from the curved surface.

An apparatus for performing ultrasonic evaluation of a portion of a pipe includes a frame assembly and a plurality of ultrasonic sensors disposed in the frame assembly. The frame assembly includes a frame which is structured to cooperatively engage an outer surface of the pipe. The frame has a curved surface which is curved about an axis which, when the frame is engaged with the pipe, generally coincides with the central longitudinal axis of the pipe. The curved surface is generally defined by a radius which is generally equal to an outer radius of the pipe. The plurality of ultrasonic sensors are disposed in the frame assembly a fixed distance from the curved surface.

The apparatus for inspecting the electrostatic chuck for substrate processing includes the electrostatic chuck including a ceramic layer and an electrode layer coupled to an inside of the ceramic layer, an ultrasonic sensor unit disposed on the electrostatic chuck, allowing an ultrasonic wave to be incident into the electrostatic chuck, and converting a reflected signal reflected through the electrostatic chuck into an ultrasonic voltage signal, and an ultrasonic inspection unit to divide the ceramic layer and the electrode layer, based on a size value of the ultrasonic voltage signal.