Influencing Factors on Welding Quality of Plastics
With the continuous development of industrial technology, plastic products have been widely used. In engineering, the composition of the material is the same as that of the welded material, but the strength label of the material is one grade higher than that of the welded material, so the welding strength can be guaranteed. So, what are the factors that influence the quality of plastic welding?
In general, pressure, time, and heat absorption (melting capacity) are the main factors affecting welding quality.
1. Pressure
In the process of plastic welding, proper pressure should be applied on the welding surface, which not only promotes the transition of the welding material from elasticity to plasticity, but also promotes the diffusion of molecules and squeezes the residual air in the weld. Thus, the sealing performance of welding joint is better.
2. Time
Welding time assurance is very important, it should have appropriate hot melt time and adequate cooling time. When the thermal power is constant, the virtual welding will occur when the time is not enough, and the excessive time will result in the deformation of the welding piece, the slag overflow, and sometimes the heat spot will appear in the non-welded part. Therefore, it is necessary to ensure that the welding surface absorbs enough heat to achieve the state of full melting, so as to ensure the full diffusion and fusion between molecules, and at the same time, to ensure sufficient cooling time for the weld to reach sufficient strength.
3. Amount of molten
Only when the melting time and thermal power are adjusted in a coordinated way can the optimal melting amount be obtained, and enough molecules can be fused to eliminate the phenomenon of virtual welding. In addition to the technical level of welding equipment and operators, various factors inside and outside the plastic have certain influence on the welding quality and should be paid attention to.
4. Other influencing factors
1) Moisture absorption of plastics, 2) Fillers in plastics, 3) The cleaning of welding surfaces
In a word, after selecting the correct welding material and excluding all kinds of unfavorable factors which affect the welding effect, the most suitable welding method should be adopted according to the shape of plastic products and the welding cost.
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