Difference between ultrasonic

and spot resistant welding

By : Basel Raafat Radwan Saleh Selim

3rd year

Production and mechanical design department

Supervisor : Dr. Hassan Abdelhafez

2015 -2016

Spot resistant welding Ultrasonic

Contacted metal surfaces are joined by the heat obtained from

resistance to electric current.

Work-pieces are held together under pressure exerted by

electrodes

ultrasonic frequency-ighHare locally applied vibrations

g held beinto work pieces together under pressure to

weld state-create a solid

1-Working principle

Due to electrical resistant Due to vibration 2-Heat produced

Mostly metals Mostly Plastic or dissimilar

materials 3-Types of materials

E=I.R 2̂.T

E is related to current , resistance

and thickness

E=(H.T) 1̂.5 E is related to Rickers

hardness number E is related to thickness of

the sheer

4-Energy formula

Lower

High

5-Tool wear

Large amount of heat Fewer amount of heat 6-Heat produced

Solid Solid 7-State

High Low 8-Cost

Rarely use filler metal No filler metal is required 9-Filler metal

No flux No flux 10-Flux