One minute to read about plastic laser welding technology

1: What is laser welding?

A: Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source.
 

2：What is laser welding of plastics?

A: Two or more plastics (same or different species), through the laser makes the plastic at the bonding surface melting, secondary polymerization under the action of clamping force, after cooling at the bonding surface to form a weld, that is, welding together, welding principle as shown in Figure.

3: What do you mean by "weld"?

A: The bonding part formed in the welded part after welding.
 

4: What do you mean by welding technology?

A: The general term for various welding methods, welding materials, welding processes, and welding equipment and their underlying theories - called welding technology.
 

5: What is meant by the welding process? What are its contents?

A: The welding process of a set of process procedures and their technical provisions. Content includes welding methods, welding preparation processing, assembly, welding materials, welding equipment, welding sequence, welding operations, welding process parameters, and post-welding treatment.
 

6: Are all plastics can be welded?

A: No, first of all, welding plastics must be thermoplastics, and then the upper layer of the welding material needs to be able to maximize the transmission of laser light, the lower layer of the material needs to be able to maximize the absorption of laser light. General welding one-component plastics are PMMA - polymethylmethacrylate (Plexiglas), PC plastic, ABS plastic, LDPE - low-density polyethylene plastic, HDPE - high-density polyethylene plastic, PVC - polyvinyl chloride plastic, PBT polybutylene terephthalate, Nylon 6 - nylon 6 Nylon 66-Nylon 66, PS-PS resin, etc. Common soldering plastics are PBT, PC, Nylon, PVC, etc.
 

7: Can two transparent plastics be welded?

A: Yes, for example, the welding of transparent materials (PC, PVC, PP, PMMA, PET), as shown below, the left is the welding of PC material with 3mm wall thickness, and the right is the welding of PVC material with 3mm wall thickness.

8: What are the methods of plastic laser welding?

A: There are mainly contour welding (a), synchronous welding (b), quasi-synchronous welding (c), roll welding (d), and irradiation mask welding (e), as shown in the figure below.

9: What is a laser welding head?

A: A laser welding head is a component of welding equipment. The laser welding head can be realized by the continuous or pulsed laser beam. The principle of laser welding head welding can be divided into heat conduction welding head welding and laser head deep fusion welding.

10: What is a laser?

A: Laser is an important part of laser welding equipment, lasers are mainly fiber lasers and semiconductor lasers, laser light sources are mainly CO2 laser, Nd: YAG laser, and semiconductor laser three.
 

11: What are the traditional plastic welding methods?

A: Traditional plastic welding methods are ultrasonic welding, friction welding, vibration welding, hot plate welding, hot gas welding, and implantation welding.
 

12: What are the advantages of the plastic laser welding process?

A: Compared with the traditional plastic welding process, laser welding has high welding strength, extremely fast heating, and cooling, small heat-affected zone, welding stress, and deformation is very small;

Non-contact processing, no external force on the welded parts, can be welded difficult to contact parts;

Stable welding process, good surface and internal quality of the weld, high performance;

Laser welding in a vacuum, air, and some gas environment can be applied, through the glass or transparent to the beam of the material for welding and many other advantages.
 

13: Do I need additives for plastic laser welding?

A: Some welding requires the use of additives, such as carbon black absorbers, but the welding of clean plastics such as medical plastic welding does not require absorbers additives.

14: What are the methods of adding absorbers for plastic laser welding?

A: First, the absorbent directly into the material to be welded; second, to the surface of the plastic parts to be welded absorbent;

Third, the two pieces of plastic parts are to be welded in contact with the spray-on or printed on the absorber.
 

15: What are the main applications of plastic laser welding?

A: Mainly used in the automotive industry, home appliance industry, medical industry, and electronic appliances industry, and so on.

For example, the automotive industry, automotive dashboard, lights, fuel system plastic parts, new energy vehicle batteries, EPB electronic parking system plastic parts, etc.;

Medical industry: micro-controlled flow parts, needle protection products, Phonak scale inhibitor, etc;

LED lighting plastic welding in the home appliance industry, etc. Some related applications are shown below:

16: What should be noted in the application of the plastic laser welding process?

A: In the case of medical products, it is better to use 1710nm or 1940nm wavelength laser without adding light absorbers and fluxes, especially for transparent plastics.

17: How to test the effect of plastic laser welding?

A: At present, most companies are in the gas tightness and bonding force of this performance test, from microscopic morphology, chemical analysis, brittleness, and other physical properties of research is very little, medical products will also involve pharmacological toxicity, biocompatibility, and other issues.
 

18: What are the welding effect testing equipment companies?

A: Shanghai three beams, Dine laser, Suzhou Furunze laser, etc.
 

19: Why has the frequency of plastic laser welding technology mentioned in the past two years increased?

A: First of all, in the era of environmental protection is increasingly important plastic laser welding has many advantages;

Secondly, the cost of the process has dropped significantly;

The third is the laser welding of special plastics began to localization.
 

20: What are the manufacturers of domestic plastic laser materials?

A: Nantong Xingchen, Jurong, Jinhu Rilong, Pulit, Jusailong, Jinfa, etc.
 

21: What are the foreign involved in laser welding of modified plastics?

A: DuPont, BASF, LANXESS, Koston, Baoli, DSM, Ankro, etc.
 

22: At present, the domestic laser welding equipment to do a better job of which?

A: Huachou, Shanghai three-beam, Huagong laser, Nanjing Dina, Da Clan laser, Jeppe, Bote laser, Sibicor photoelectricity, Jiuheng photoelectricity, Suzhou Furunze laser, etc.
 

23: What are the foreign laser welding equipment companies?

A: Leydan, Pitney Bowes, LKPF, Rolfing, TongFast, etc.
 

24: What are the famous laser enterprises at home and abroad?

A: Wuhan Rike, Keplin Optoelectronics, Changguang Huaxin, Beijing Lanxi Huaxing Optoelectronics, IPG, DILAS, nLIGHT, LASER, QPC, etc.