Systems and methods to improve weld quality are described. For example, certain systems and methods described use weld quality monitoring as feedback to an ultrasonic welding process to improve weld quality. Still other systems and methods provide improvement to double sided and single sided ultrasonic welding through the use of selected multiple pulses.

Systems and methods to improve weld quality are described. For example, certain systems and methods described use weld quality monitoring as feedback to an ultrasonic welding process to improve weld quality. Still other systems and methods provide improvement to double sided and single sided ultrasonic welding through the use of selected multiple pulses.

A tube sealing positioning apparatus has a tube holder slidable on a vertical guide from a lower to an upper portion of a sealing chamber for positioning adjacent a heating apparatus and a clamping apparatus. The heating apparatus may have a nozzle to direct heated air on an open end of a plastic tube. The clamping apparatus may have two clamping devices slidably disposed to clamp the heated open end of the plastic tube to fuse the tube wall adjacent the open end. A control processor may be connected to control movement and dwell time of the tube holder, and to control heat application and clamp spacing and time. A sealed tube may be attached to a top cover to be positioned in a test container. A sealing disk may close the top cover and may direct fluid pressure into the tube and apply a vacuum to the test container.

A method for welding hygroscopic plastics parts, preferably pipeline components, by means of a butt-welding machine, wherein the two plastics parts are clamped and fixed in a coaxial position in relation to one another by means of a clamping device.

A pressure welding device (1), especially a friction welding device, holds workpiece parts (2, 4) in clamping devices (6, 7) and axially moves the workpieces towards each other by means of a feed device (21). The pressure welding device (1) has a measuring device (8, 13), measuring in a contactless manner. The measuring device detects the surface condition and/or the concentricity and/or true running and/or the axial runout and/or radial runout in a front welding region (3, 5) of a workpiece part (2, 4).

A device for detecting defects during sealing of a package including a foil, and a method for detecting defects during sealing of a package including a foil which makes use of such a device. The device may include a distance sensor for determining the distance between at least two clamping elements, and a control unit coupled to the distance sensor for comparing the measured distances to predefined references. Such a device may be operated by, for example, positioning a foil and another part of a package to be connected to the foil between the clamping elements, moving the clamping elements toward one another until a connection between the foil and the other part of the package is formed, determining the distance between the clamping elements over a period, moving the clamping elements apart, and removing the package.

A bag forming apparatus includes a pair of opposed sealing bars arranged on opposite sides of a forming plane, a pair of guide arms, each extending from a first arm end through the forming plane to a second arm end and carrying a respective one of the pair of opposed sealing bars, a mounting frame to which the pair of guide arms are movably mounted between the first and second arm ends, and a drive shaft connected to the second arm end of each of the pair of guide arms such that shaft rotation is operable to move the pair of opposed sealing bars into and out of engagement across a web of bag forming material traveling therebetween in the forming plane. The drive shaft can be translatable relative to the mounting frame to adjust a closure gap between the pair of opposed sealing bars.

An ultrasonic welding system includes a movable ultrasonic welding stack for applying vibrational energy to a workpiece. A motion control system controls the motion of the ultrasonic welding stack and one or more sensors sense a control variable and output a corresponding control signal. A controller provides control inputs, based on the control signal, to the motion control system and causes, following initiation of a welding operation, an automatic change of speed of motion of the ultrasonic welding stack. The automatic change of the speed is a function of at least one control variable until the control variable reaches a predetermined value.

A product detection system includes a first frame piece configured to be coupled to a first sealing jaw of a sealing machine, a second frame piece configured to be coupled to a second sealing jaw of the sealing machine, a first detector bar slidably coupled to the first frame piece, a second detector bar slidably coupled to the second frame piece, a first linear actuator coupled to the first detector bar to move the first detector bar, and a second linear actuator coupled to the second detector bar to move the second detector bar. An encoder is coupled to the second detector bar to detect movement of the second detector bar. The first and second linear actuators are configured to move the first and second detector bars toward one another.

A feedback control system for use with ultrasonic welding. A weld energy set point and/or a reference power curve are used by a controller to provide a power supply voltage set point and a power supply frequency set point for the power that is to be drawn by an ultrasonic weld generator. Information regarding the actual voltage and/or frequency of the drawn electrical power, and/or the frequency and magnitude of an ultrasonic wave transmitted from the generator to an applicator tool used to weld an object can be utilized by an estimator to estimate the weld energy dissipated at the weld site and/or generate a power curve for the welding operation. Using information from the estimator, the controller can determine adjustments for variables for the current and/or future welding operations. Further, welding may not commence until a clamping force exerted on the object satisfies a clamping force set point.