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26900721058_PE-ME702H.pptx
1. MODERN INSTITUTE OF
ENGINEERING & TECHNOLOGY
MECHANICAL
DEPARTMENT
7th SEMESTER
SEAM WELDING
MADE BY:-SUKANTA MANDAL
Roll NO-26900721058
Sub-Advanced Weling Technology(PE-ME702H)
2. Seam Welding
Lesson Objectives
When you finish this lesson you will
understand:
• The various forms of seam welding
• Nugget formation mechanisms
• Quality testing of Seam Welds
Learning Activities
1. View Slides;
2. Read Notes,
3. Listen to lecture
Keywords
Roll Spot Weld, Overlapping Seam Weld, Continuous Seam Weld,
Lap Seam Weld, Mash Seam Weld, Metal Finish Seam Weld, Butt
Seam Weld, Foil Butt Seam Weld.
18. Waddell, Mechanism of weld formation…,
Welding and Metal Fabrication, Aug 1995
1
2
3 4
Stage 1 Takes 1 - 4
cycles, Increased
resistance due to
increased temp
outweighs reduction in
resistance due to better
surface contact through
asperity softening and
surface oxide
breakdown
Peak occurs earlier
with thinner
materials
Resistance Curve for Establishment
of Leading Edge of a Continuous Nugget
19. Waddell, Mechanism of weld formation…,
Welding and Metal Fabrication, Aug 1995
1
2
3 4
Stage 2 Drop in
resistance because of
current shunting into
the mushy and solid
state bonded region
20. Waddell, Mechanism of weld formation…,
Welding and Metal Fabrication, Aug 1995
1
2
3 4
Stage 3 Instability in
current path, nugget
approaching a steady
state growth mode
22. Waddell, Mechanism of weld formation…,
Welding and Metal Fabrication, Aug 1995
1
2
3 4
Stage 4 Steady State
Growth of Nugget
until either expulsion
or current off time and
new nugget formation
