A Seminar PPT on Plastic Welding

1. PLASTIC WELDING
- M V P VISHNU NANDAN

2. INTRODUCTION
 Mechanical fasteners, adhesives, and welding processes can all be employed to form
joints between engineering plastics.
 Mechanical fasteners can join two components quickly, but they do not provide leak
tight joint, and the localized stresses may cause them to pull free of the polymeric
material.
 Adhesives can provide good properties and fully sound joints, but they are difficult
to handle and slow to cure. Also joint preparation & surface cleanliness need to be
given importance in adhesive bonding.
 Thermoplastics can be easily welded as they can regain their shape after heating.
 Most commonly welded plastics are PVC, Polythene, acrylics, etc.
 They are welded by melting the surface to be joined and allowing them to solidify.

3. METHODS FOR JOINING
 The methods for joining plastic components can be
divided into major categories:
1. Mechanical Joining
2. Adhesive Joining
3. Welding

4.  Welding process are classified by the heating method that is
used, they are:
1. External Heating
2. Internal Heating
 Welding Rod

6. HOT PLATE WELDING

7. HOT GAS WELDING

8. ULTRASONIC WELDING

9. FRICTION WELDING

10. HOT WEDGE WELDING

11. EXTRUSION WELDING

12. INFRARED WELDING

13. LASER WELDING

14. INDUCTION WELDING

15. ADVANTAGES
 Plastic welding generally does not require intensive
surface preparation steps, which adhesives often do.
 Plastic welds are much lighter than mechanical fasteners.
 Welding can provide a leak tight, air tight seal.
 Very fast process.
 Economical.
 Relatively low cost of equipment.

16. APPLICATIONS
 Polyethylene (PE) pipe welding for gas line installations.
 Fuel tank assemblies for the automotive industries.
 It is used for fabricate pipelines, pond liners, and a wide variety of
vessels.
 Used to join broken plastics easily.
 Food packaging, computer components.
 Challenging and critical application is the standard disposable butane
lighter.
 Used to make thermoplastic manifolds for the automotive industries.
 Brake fluid reservoirs, automotive marking lights.

17. REFERENCES
 E.Paul Degarmo, J.T Black, Ronald A Kohser, Materials and processes in
manufacturing, Prentice Hall, India.
 Robert A Grimm, Welding processes for plastics, Advance materials
and processes, vol 147, 1995.
 Joining plastics in production, The welding institute
 Grewell D.A.; BenatarA.; Park J.B. (2003). Plastics and Composites
Welding Handbook. Hanser Publishers, Munich.
 www.google.com
 www.wikipedia.com

18. INHALE CONFIDENCE,
EXHALE DOUBT.

19. EVERY ENDING IS REALLY
JUST A NEW BEGINNING.

20. THANK YOU!