Welding ultrasonic spot

The list below gives well-established benefits that can result from the use of adhesives in preference to joining methods such as riveting, bolting, spot welding, ultrasonic welding. 

Besides spot welding, ultrasonics can be used to insert metals into plastic, stake materials to plastics, scan weld flat parts, and degate runner assemblies. 

This paper deals with the control of weld depth penetration for cylinders in gold-nickel alloy and tantalum. After introducing the experimental set-up and the samples description, the study and the optimization of the testing are presented for single-sided measurements either in a pulse-echo configuration or when the pump and the probe laser beams are shifted (influence of a thermal phenomenon), and for different kind of laser impact (a line or a circular spot). First, the ultrasonic system is used to detect and to size a flat bottom hole in an aluminium plate. Indeed, when the width of the hole is reduced, its shape is nearly similar to the one of a slot. Then, the optimization is accomplished for... 

Ultrasonic welding is clean and fast (20-30 parts per minute) and usually results in a joint that is as strong as the parent material. The method can provide hermetically sealed components if the entire joint can be welded at one time. Large parts generally are too massive to be joined with one continuous bond so that spot welding is necessary. It is difficult to obtain a completely sealed joint with spot welding. Materials-handling equipment can be easily interfaced with the ultrasonic system to further improve rapid assembly. 

Figure 8.11 Ultrasonic joining operating, (a) Swaging the plastic ridge is melted and reshaped (left) by ultrasonic vibrations to lock another part into place, (b) Staking ultrasonic vibrations melt and reform a plastic stud (left) to lock a dissimilar component into place (right), (c) Insertion a metal insert (left) is embedded in a preformed hole in a plastic part by ultrasonic vibration (right), (d) Spot welding two plastic components (left) are joined at localized points (right).

Ultrasonic welding Spot welding Plasma arc welding Laser beam welding Electron beam welding Furnace brazing Diffusion brazing Anaerobic Cyanoacrylate Epoxy resin Hot melt... 

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