The seminar on plastic welding, guided by Mr. Vikram Kapoor, provided an overview of various plastic welding methods, particularly ultrasonic welding, which creates molecular bonds between thermoplastics using high-frequency mechanical motion. It detailed applications across multiple industries, including toys and biomedical devices, with an emphasis on control parameters like weld and hold times. The seminar emphasized the importance of ultrasonic welding's three-part unit consisting of a transducer, booster, and welding horn.

1. SEMINAR – PLASTIC WELDING <Mechanical Engg.>
SCHOOL OF AERONAUTICKS
STUDENT NAME: SOMANSH KALRA
REGN. NO. 2085
SEMESTER: 1St
COURSE : B’TECH INTEGRATED
GUIDEED BY : Mr. VIKRAM KAPOOR
DATE : 07th OCT 23

2. SEMINAR – PLASTIC WELDING
DATE : 07th OCT 23
CONENTS:
INTRODUCTION OF PLASTIC WELDING
TYPES OF WELDING
PLASTIC WELDING
MACHINE & EQUIPMENT
PROCEDURE & APPLICATION

3. SEMINAR – PLASTIC WELDING
What is Welding:
 Welding is a fabrication process whereby two or more parts are fused
together by means of heat, pressure or both forming a join as the parts
cool.
 Welding is usually used on metals and thermoplastics but can also be
used on wood.
PART A
PART B
WELD METAL/FUSED METAL
TYPES OF Welding:
SEMINAR TOPIC:
PLASTIC WELDING which Come
Under Ultrasonic Welding.
I am going to Explain Brief
about Plastic /Ultrasonic
Welding , in Next Slides.

4. SEMINAR – PLASTIC WELDING
What is PLASTIC Welding:
 Plastic welding is the process of creating a molecular bond between two
compatible thermoplastics.
 Plastic welding processes are primarily differentiated by their heating
methods.
 There are several methods of plastic welding.
 Ultrasonic Plastic Welding.
 Laser Welding.
 Infrared Welding.
 Hot Plate Welding.
ULTRASONIC PLASTIC WELDING :
 Ultrasonic plastic welding (USW) is the joining or
reforming of thermoplastics through the use of heat
generated from high-frequency mechanical motion.
 It is accomplished by converting high-frequency electrical
energy into high-frequency mechanical motion.

5. SEMINAR – PLASTIC WELDING
APPLICATION:
 It can fasten blister packs and facilitate the manufacturing of a variety of
products.
 Toys, disposable lighters, pipettes and intravenous catheters.
 Ultrasonic welding is commonly used in the plastics, aerospace and
automotive industries to join similar materials
CONTROL PARAMETER:
 Weld time would be between . 02 – 2.0 seconds.
 Hold time refers to the amount of time, after ultrasonics has been applied
to thermoplastic parts
 Pressure is held on the parts to assure that the melted plastic has
solidified.

6. SEMINAR – PLASTIC WELDING
ULTRASONIC WELDING PRINCIPLE:
 Ultrasonic energy of an oscillator propagates through a
horn
 Tip of the horn vibrates in direction perpendicular to
pressurizing direction (lateral vibration).
 Metal bonding is possible by applying a head load .
 Ultrasonic vibration to the work (object to be bonded).

7. SEMINAR – PLASTIC WELDING
It is generally a three-part unit consisting
of transducer, booster and welding horn,
mounted on the welding press at the
centre-point of the booster section. The
stack is a tuned resonator, rather like a
musical instrument tuning fork.

8. SEMINAR – PLASTIC WELDING
DATE : 07th OCT 23