Ultrasonic Hand-held Spot Welder

Ultrasonic Hand-held Spot Welder is especially suitable for situations that require rapid processing time, good processing reliability or the use of other fillers or solvents. Ultrasonic spot welding is also characterized by the quality, strength and accurate reproducibility of the weld. In ultrasonic welding, high-frequency mechanical vibration will cause friction between molecules and interface in the joint area. This generates the heat required for welding and the material is plasticized. Under the action of ultrasonic, the uniform and stable connection area can be achieved through a short cooling time, while maintaining the welding pressure.

Specification of Ultrasonic Hand-held Spot Welder

FAQ:

What kind of plastic materials suitable for welding?

Ultrasonic Hand-held Spot Welder is suitable for thermoplastics rather than thermosetting polymers. Most thermoplastics have an amorphous structure with a certain degree of crystallinity, which means that some areas have an ordered structure. Thermoplastics soften over a wide temperature range and have a glass transition temperature. Thermosetting polymers are crystalline and have obvious melting points. Crystalline polymers will remain solid until their melting point is reached, and then melt immediately. This property is very unsuitable for ultrasonic welding.

ABS, acrylic acid, polycarbonate and PVC are amorphous polymers with little or no crystal structure. These thermoplastics are very suitable for ultrasonic welding. Ultrasonic welding of two parts made of the same plastic material usually achieves the best results. In addition, the materials of the two thermoplastic parts must be chemically compatible. Otherwise, even if the two materials may melt together, there will be no molecular bond. A good example is welding polyethylene to polypropylene. These two semi crystalline materials have similar appearance and many common physical properties. However, they are chemically incompatible and therefore cannot be welded to each other.

Solutions to Several Common Problems in Ultrasonic Plastic Welding

1, There are several main reasons for the inconsistent fusion effect: incorrect proportion of additives, poor material quality, and wear of the injection molding curtain. The solution to the problem is to adjust the proportion of the additives correctly and fix them, use high-quality materials, and inspect the injection mold before welding.

2, The reasons for this phenomenon are: ultrasonic concentrated damage, and the contact surface between the plastic and the welding head does not match. The method to solve the problem is to repair the welding related positions to avoid voids; Repair the contact surface to ensure that the plastic box welding head matches.

3, The main reason for insufficient fusion is that the input energy of the plastic parts is too small. There are several ways to solve this problem: increasing welding time or air pressure, increasing amplitude, using high magnification amplifiers, and using high-power welding machines;

4, Excessive welding can lead to excessive welding when too much energy is input into plastic parts. This problem can be solved through the following methods: reducing welding time or reducing air pressure, reducing amplitude, using low magnification amplifiers, and using low-power welding machines.

5, The reason for the occurrence of cracking and fracture of plastic parts is that the plastic parts themselves are relatively fragile and the amplitude of ultrasonic waves is too large. The solution is to thicken the plastic parts, reduce ultrasonic amplitude, and use an amplifier.

6, The reasons for this phenomenon caused by perforation of plastic parts include: long welding time, low ultrasonic amplitude, and concentrated ultrasonic damage. The methods to solve this problem include reducing the welding machine time, increasing the amplitude, using high-power welding machines, and thickening plastic parts. When there is a welding problem, the first step is to clarify what the problem is, identify the cause of the problem, and then take targeted measures, which can achieve twice the result with half the effort.

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