Laser Transmission Welding Polypropylene Plastics

et al. 2015

KEM

Light scattering of the upper polymer have a great influence on welding quality. Light scattering of high density polyethylene (HDPE) and low density polyethylene (LDPE) are assessed by constructing experiment and numerical computation method. Firstly, the beam quality of semiconductor laser is analyzed, power flux distribution of the laser beam in a defocused plane is measured by knife edge method; Afterwards, the power flux distributions of the laser beam after passing through HDPE/LDPE are measured by line scanning method; Lastly, with the combination of the mathematical model which is used to calculate scattering coefficient and standard deviation of scattering, scattering related parameters and the laser power flux distribution at the welding interface are obtained by writing a program in MATLAB. The results show that the light scattering coefficient of high density polyethylene is up to 0.988, the light scattering coefficient of low density polyethylene is 0.92; Higher crystalline polyethylene leads to more obvious light scattering; the laser beam power flux distribution at the weld interface affected by scattering is determined, which lays a solid foundation on numerical simulation in laser transmission welding.

Section: Fig1 Schematic Of Knife-edge Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Light Scattering of HDPE and LDPE in Laser Transmission Welding

Zhong

Fan

et al. 2015

KEM

“…According to the research results of laser welding technology of plastic at present, foreign study in the plastic laser welding is more extensive, many techniques have been industrialization. However, domestic research on this subject is also not many, mainly concentrated in universities and research institute [7,8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Research Status and Development Trend of Laser Welding Technology of Plastic

et al. 2013

AMR

The technological and economic advantages of laser welding of plastics in comparison to the traditional welding process and research situation are analyzed in this paper. Process methods of this technology are reviewed as well as the range of application for these manners is compared. The technological challenges facing the further development of the technology and the critical issues needing to be solved are deeply investigated. It is pointed out that efficient prevention of plastics distortion and cracking as well as control of internal structure and defects are currently the two bottleneck obstacles challenging the further development and industrial applications of the revolutionary advanced manufacturing technology. The developments of laser welding technology of plastics in the future are also forecasted.

“…However, the direct laser transmission joining on the metal and polymer is still in the development stage, the joining strength of welded seam is still relatively low, so it need to be further improved. Optimizing welding process parameters and choosing better absorbent have been commonly used to improve the joint strength [5][6][7],but in some applications，the needs of higher joining strength is not enough satisfied.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Laser Transmission Joint Strength: Based on the Surface Pitted 304 Stainless Steel and PA66

Zhao

Huang

et al. 2013

KEM

In this paper,the laser transmission joint strength is studied with semiconductor laser based on the surface pitting of 304 stainless steel and PA66.Unevenly distributed pits are formed on the surface of 304 stainless steel with 10% ferric chloride solution for two hours, which have certain morphology, depth and size. Different laser power, welding speed and welding pressure are used in laser transmission joining 304 stainless steel and PA66,which 304 stainless steel contains pitting corrosion before and after. The tensile strength test of joined samples shows that: the joint strength of pitted 304 stainless steel and PA66 with laser transmission joining is improved at least 135%; the riveted structure formed at the joining interface improve the joint strength.