• Ashutosh Santosh Khedvan
• Kishor P. Kolhe

Plastic is a material comprising of a wide range of semi-synthetic or synthetic organics that are malleable and can be molded into solid objects of different shapes.Today, joining of thermoplastic composite structures is becoming more significant since thermoplastic composite materials are being used to replace metallic or thermoset composite material to better withstand various loads in automotive, aerospace, agricultural machineries and marine industries. Plastic welding is reported in ISO 472 as a process of joining softened surfaces of materials, with the help of heat. Welding of thermoplastics is accomplished in three successive stages, as follows surface preparation, application of heat and or pressure, and cooling. Numerous welding methods have been evolved for the joining of plastic materials. This paper presents development one of the hot air plastic welding where the hot air is used to fuse or melt a filler thermoplastic rod and simultaneously heat the surfaces to be joined. In case of hot-gas welding the parameters of welding such as welding temperature, flow rate, feed rate, welding force, gas, angle, filler rod, Pressure of hot air/gas, Gap distance and shoe influence the strength of the welded joint. In this sequence A welding machine was designed and built to make the feed rate of manual hot-gas welding controllable and independent of human factors. The performance of the above developed machine was carried out by preparing seven samples of varying welding, feed rate keeping other parameters constant throughout the experiments. The strength of welded Polypropylene material joint was tested by using ASTM D 638 standard tensile test digital Universal Testing Machine. Also it was observed from the experimental study that feed rate influence the strength of the welded joint significantly

Plastics, Hot gas welding, Process Parameters, Polypropylene, Filler feed rate, ,Tensile Test.

"Development of hot air plastic welding machine for welding of Polypropylene material ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.3, Issue 7, page no.101-108, July-2016, Available :http://www.jetir.org/papers/JETIR1607022.pdf

"Development of hot air plastic welding machine for welding of Polypropylene material ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.3, Issue 7, page no. pp101-108, July-2016, Available at : http://www.jetir.org/papers/JETIR1607022.pdf