The Influence of Technological Parameters on Durability of Products from ABS Plastic at Ultrasonic Welding

An ultrasonic welding method for round-shaped products made from ABS plastic is described in this paper. This method can eliminate roughness and waviness on the contact surface between the planimetric waveguide and the welded part, increase heat removal from the surface of the welded part in the subwaveguide zone and improve the efficiency of ultrasonic welding as well as the strength and quality of the welded joint. It is shown that a mushroom-shaped waveguide is the optimal choice for planimetric ultrasonic welding of ABS parts of the fan wheel type with regard to the uniformity of the oscillation amplitude distribution along the perimeter of the waveguide’s working end face. The optimal form of the waveguide’s working end face is defined that entails fixing the connecting parts relative to the waveguide’s axis along their diameter. It is established that at a certain combination of the ultrasonic welding modes for ABS plastic the rate of deformation at large welding pressures can turn out to be higher than at small pressures. This is caused by the competition of three factors: temperatures, static welding pressure and concentration of energy on the welded surfaces. It is determined that for welding ABS plastic the so-called soft modes of ultrasonic welding with small static welding pressure and oscillation amplitude of the waveguide’s end face should be used. In this case welding occurs only due to the distribution of microroughness, without dents from the waveguide on the surface of the welded material. Optimal welding parameters for ABS plastic are determined.

References

[1] Volkov S.S., Prilutskiy M.A. Influence of thermal processes on the weldability of ABS plastic by ultrasound. Welding and Diagnostics, 2015, no. 3, pp. 34–38 (in Russ.).

[2] Volkov S.S. The effect of conditions of ultrasound welding in the fracture force of nonwoven materials. Welding International, 2005, no. 19(6), pp. 484–489, doi: 10.1533/wint.2005.3473

[3] Volkov S.S. Svarka i skleivanie polimernykh materialov [Welding and bonding of polymeric materials]. Moscow, Khimiya publ., 2001. 376 p.

[4] Volkov S.S., Konovalov A.V., Vybornov A.P. Method of calculation of parameters of ultrasonic welding of products from polymeric materials. Welding and Diagnostics, 2016, no. 2, pp. 35–39 (in Russ.).

[5] Volkov S.S., Sokolov V.A., Shestel’ L.A. Technology and equipment for welding elastic containers from a film of the PTFE-4MB. Welding and Diagnostics, 2013, no. 3, pp. 52–55 (in Russ.).

[6] Aleshin N.P., Chernyshov G.G. Svarka. Rezka. Kontrol’: spravochnik [Welding. Cutting. Control: a Handbook]. Vol. 1. Moscow, Mashinostroenie publ., 2004. 624 p.

[7] Volkov S.S. Primary processes and features of heterogeneous plastics welding. Welding production, 2007, no. 5, pp. 38–43 (in Russ.).

[8] Volkov S.S. Ultrasound welding of cylindrical components made of polyamide 610. Welding International, 2012, no. 26(1), pp. 54–57, doi: 10.1080/09507116.2011.592715

[9] Volkov S.S. Dependence of the breaking force of non-woven fabrics on weld pitch in ultrasound welding. Welding International, 2005, no. 19(8), pp. 665–668, doi: 10.1533/wint.2005.3505

[10] Volkov S.S. Technology for ultrasonic welding multi element components produced from rigid plastics. Welding International, 2004, no. 18(3), pp. 242–245.

[11] Volkov S.S. Joining thermoplastics with metallic and non-metallic materials. Welding international, 2013, no. 27(3), pp. 163–166, doi: 10.1080/09507116.2012.695551

[12] Volkov S.S. Using piezoelectric oscillating system for welding synthetic fabrics. Welding international, 2013, no. 27(3), pp. 720–724, doi: 10.1080/09507116.2012.753281

[13] Lyushinskiy A.V. Diffuzionnaya svarka raznorodnykh materialov [Diffusion welding of dissimilar materials]. Moscow, Akademiya publ., 2006. 208 p.