When choosing an ultrasonic plastic welding machine welding head, the following aspects can be considered

1. Welding head material
Aluminium Alloy
Advantages: Low cost, lightweight, easy to operate; Processing is relatively easy, and various shapes of welding heads can be quickly produced.
Disadvantages: Low hardness, poor wear resistance, and relatively short service life; In high-frequency and high-intensity welding work, deformation is prone to occur.
Applicable scenarios: Suitable for production with low welding requirements, small and medium-sized production, or situations with strict cost control. For example, welding the plastic casing of some small electronic products.

Titanium alloy
Advantages: High strength, good corrosion resistance, and not easy to rust; It is harder than aluminum alloy, with greatly improved wear resistance and longer service life.
Disadvantages: Relatively high price; The processing difficulty is greater than that of aluminum alloy.
Applicable scenarios: Suitable for situations with high quality requirements for welding heads and long-term high.
Strength welding. For example, welding of larger plastic parts such as automotive components.

Hard Alloy Ateel
Advantages: extremely high hardness, excellent wear resistance, and the longest service life among the three materials; Capable of withstanding extremely high pressure and temperature, suitable for harsh welding environments.
Disadvantages: High cost, difficult processing; Relatively heavy in weight.
Applicable scenarios: Suitable for large-scale, high demand industrial production, especially in situations where welding Strength and accuracy are extremely high. For example, plastic component welding in the aerospace industry.

2. Welding head shape and size
Select according to the shape of the welded workpiece
For plastic workpieces with flat shapes, a flat welding head can be selected to evenly transmit ultrasonic energy and ensure the firmness of the welding surface.
If the workpiece is circular or curved, a welding head of the corresponding shape should be selected to ensure a good fit with the workpiece and improve the welding effect.
For workpieces with complex shapes, it may be necessary to customize welding heads with special shapes to ensure that ultrasonic energy can be concentrated at the welding site.

Consider the size of the welding area
The size of the welding head should match the size of the welding area. If the welding head is too large, it may cause energy dispersion and poor welding effect; If the welding head is too small, it may not cover the entire welding area and affect the welding strength.
For smaller welding areas, a small welding head can be chosen to increase energy density and ensure welding quality.
For larger welding areas, larger welding heads are required to provide sufficient energy.

3. Frequency matching
Different ultrasonic plastic welding machines have different operating frequencies, commonly including 15kHz, 20kHz, 35kHz, etc. The frequency of the welding head should match the frequency of the welding machine, otherwise it will affect the efficiency of ultrasonic energy transmission and even damage the welding machine and welding head.
When selecting a welding head, it is important to confirm its applicable frequency range and compare it with the frequency of the welding machine used to ensure a match between the two.

4. Brand and Quality
Choosing welding heads from well-known brands usually ensures better quality. These brands typically have strict quality control systems that rigorously test the materials, processing techniques, and performance of welding heads to ensure their reliability and stability.
The quality of welding heads can be evaluated by examining the brand's reputation, user reviews, and industry recognition. At the same time, understanding the brand's after-sales service is also important, including support for welding head maintenance, replacement, and other aspects.

5. Cost considerations
The price of welding heads varies depending on factors such as material, size, and brand. When choosing a welding head, it is necessary to consider both cost and performance comprehensively. We cannot simply pursue low prices while neglecting the quality and applicability of welding heads.
For long-term use of ultrasonic welding equipment, choosing high-quality and durable welding heads may have higher initial costs, but it can reduce later replacement and maintenance costs and improve production efficiency.