I. First, establish three selection criteria
1. Material: Only thermoplastics are weldable; PP/PE are difficult to weld with ultrasonics, ABS/PC are easy to weld with ultrasonics, and PVC requires high-frequency induction
2. Product structure: Circular = rotary fusion; small parts sealing = ultrasonics; large part housings = hot plate/vibration friction; precision, seamless = laser
3. Production capacity budget: Small-batch prototyping → simple desktop machine; Mass production assembly lines → Servo-driven fully automatic machines
II. Detailed Selection Guide for Each Machine Type
1. Ultrasonic Welding Machine (Most Common)
Applications: Small parts made of ABS, PC, PS, AS, PMMA, and modified nylon
Dimensions: Single part ≤150mm, wall thickness 1–4mm
Products: Electronic enclosures, chargers, toys, filter caps, small home appliance parts
Power Selection
- 200W–800W: Small snap-fit parts, plastic enclosures
- 1500W–2600W: Medium-sized sealing parts, waterproof enclosures
- 3200W–4200W: Large-surface ABS parts
Not suitable for: Thick PP/PE, large-area soft rubber, extra-long irregularly shaped parts
2. Hot Plate Welding Machine
Suitable for: PP, PE, ABS, PA, water tanks, cavities, long strip-shaped plastic parts
Advantages: Large surface area, deep wall thickness, high airtightness requirements
Selection Criteria
- Vertical hot plate: Small to medium parts (water pitchers, oil bottles)
- Horizontal hot plate: Long parts (automotive air ducts, long strip-shaped housings)
- Servo-driven hot plate: High-precision automotive parts, new energy housings (temperature control ±1°C)
Prohibited: Transparent PC products prone to scorching and yellowing
3. Rotational Friction Welding Machine
Requirements: Workpieces must be circular rotating bodies
Materials: PP, PE, ABS, and nylon are all suitable
Products: Filter cartridges, water pipe fittings, spherical housings, and thermos body forming
Model Selection
- Stroke ≤50mm: Small filter cartridges
- Long-stroke heavy-duty: Automotive oil reservoirs, large connectors
4. Vibration Friction Welding Machine
Applications: Large irregularly shaped parts (automotive bumpers, headlights, intake manifolds)
Fully compatible with PP/PE/PA/ABS
Selection: Categorized as small/medium/large based on effective welding area; high cost; used exclusively by large manufacturers
5. High-Frequency Induction Welding Machines
Welds only polar plastics: PVC, TPU, PU, EVA, Nylon
Products: Plastic packaging bags, waterproof cases, inflatable toys, sealing rings
6. Laser Plastic Welding Machines
High-end precision: Transparent + opaque dual-color plastics
Products: Medical components, sensors, lithium-ion battery casings, precision electronics
Advantages: Seamless joints with no material overflow; high cost
III. Quick Selection Reference Chart
|
Product Features |
Preferred Models |
|
Small ABS waterproof case |
Ultrasound |
|
PP Water Tank / Sealed Enclosure |
Hot Plate |
|
Round plastic connector |
Rotary melting |
|
Large automotive plastic parts |
Vibration and Friction |
|
PVC Soft Plastic Packaging |
High-frequency induction |
|
PVC Soft Plastic Packaging |
Laser |
IV. Model Selection by Configuration Level (Budget Categories)
1. Economy Model (Small Workshop Prototyping)
Standard pneumatic model, mechanical temperature control, no data storage
Suitable for: Prototypes, small orders
2. Standard Industrial Model (Mass Production in Injection Molding Factories)
Digital parameter display, pneumatic + fine-tuning, programmable
Mainstream procurement model
3. High-End Servo Model (Automotive Parts/New Energy)
Servo closed-loop pressure control, precise temperature control, data upload to MES, workpiece crush protection
V. Key Considerations for Avoiding Pitfalls
1. Do not blindly choose ultrasonic for PP/PE; virtual welding is highly likely. Prioritize hot plate or rotary melting.
2. For airtightness requirements: Hot plate > Ultrasonic
3. For mark-free surfaces: Laser > Ultrasonic > Hot plate
4. For high-volume production, prioritize automation (multi-station turntable ultrasonic, automatic loading/unloading hot plate)
5. Food/Medical: Select stainless steel frames and cleanroom-grade ultrasonic systems
VI. Standard Models for Downstream Industries
- Home Appliances: Ultrasonic + Hot Plate
- Automotive parts: Hot plate + vibration friction + rotary welding
- Packaging: High-frequency induction + ultrasonic
- New energy lithium batteries: Servo hot plate, laser
- Water purification industry: Rotary welding + hot plate
