ultrasonic welding


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ultrasonic welding

[¦əl·trə′sän·ik ′weld·iŋ]
(metallurgy)
A nonfusion welding process in which the atomic movement required for coalescence is stimulated by ultrasonic vibrations.

Welding, Ultrasonic

 

a method of welding that uses ultrasound to transmit vibrations to a tool clamped to the surfaces of the materials being welded.

Metals are welded in the solid phase, without melting. A metal is heated to 200°–600°C by friction between the tool and the metal. The vibrations of the tool promote surface cleaning, and the resulting weld is therefore of good quality.

Ultrasonic welding is used primarily to join sheet metals (such as Al, Ti, and Cu), certain alloys, and plastics at individual spots or along continuous seams. The thickness of the sheets is 0.1–2 mm. The welding time for spot welding is 0.1–5.0 sec when the clamping force of the tool is 20–200 kilograms-force (0.2–2 kilonewtons).

When workpieces with different thicknesses are welded, one workpiece should be thin, that is, not thicker than 1 mm, but the other may be as thick as desired.

The equipment employed for ultrasonic welding includes a high-frequency electron-tube oscillator with a power output of 0.5–5 kilowatts and a magnetostrictive transducer with a core whose length may be varied. The core is coupled to a wave-guide acoustic intensifier that supports a force-application device with a hard-alloy tip. Ultrasonic welding is used primarily in the radio-engineering, electronic, and electrical-engineering industries.

REFERENCES

Silin, L. L., G. F. Balandin, and M. G. Kogan. Ul’trazvukovaia svarka. Moscow, 1962.
See also references under .

K. K. KHRENOV

ultrasonic welding

A solid-state welding process in which the metals are joined by the local application of high-frequency sound waves as the work parts are held together under pressure.

ultrasonic welding

The bonding of materials, typically made of plastic, by pressing them together and vibrating them at ultrasonic speeds for a fraction of a second. It is a very fast, very clean way to combine objects together. First used to bond toy parts in the 1960s and widely used in the automobile industry starting in the 1980s, ultrasonic welding is used to weld myriad plastic elements together. See ultrasonic.


Bonding Plastic Parts
In this example, the two plastic parts are placed into the chamber, and the head is pressed down. The welding operation takes a fraction of a second.
References in periodicals archive ?
If part geometries are more complex or cannot withstand the particulates ultrasonic welding can generate, laser welding might be the preferred choice.
Experimental studies on optimization of process parameters and finite element analysis of temperature and stress distribution on joining of Al-Al and Al-Al2O3 using ultrasonic welding, The International Journal of Advanced Manufacturing Technology, 55(5): 631-640.
It is expected that weld strength increases with amplitude since volumetric heating during ultrasonic welding is proportional to strain squared ([[epsilon].sub.0.sup.2]) as defined in Eq.
A kinematical study of ultrasonic welding based on a system of stationary waves, Journal of Optoelectronics and Advanced Materials, Vol.
The paper seeks to highlight the important influence in the ultrasonic joining process of a secondary technological parameter, the sonotrode active surface geometry, together with basic energetic parameters of the ultrasonic welding process such as welding time, welding force, and ultrasonic micro vibrations amplitude.
A silicone string seal is now inserted between the case neck parts prior to ultrasonic welding, the circuit board has been coated and other key components sealed against moisture.
It also offers a detailed examination of specific assembly and design techniques, such as ultrasonic welding, press fitting, and snap fitting.
If you look at what we have done with ultrasonic welding, for example, or engine control systems and the way we have adapted NeuroNet throughout our electronic controls, we are doing things that small manufacturers simply could not do--so it's very healthy."
Vibrations during ultrasonic welding of capsule halves were shaking loose the tiny brass rods, called lubber lines, along which mariners make their sightings.
Tennex uses Branson ultrasonic welding equipment at all their sites including those in Japan and the UK, which enables it to exchange readily and smoothly machine settings and other critical welding information within its global network.
An energy director is widely used in ultrasonic welding to increase the welding speed and quality.

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