Resistance Welding Flashcards
What is resistance welding?
A welding process using electric resistance to generate heat without consumables, shielding gases, or flux.
What is the modified heat generation equation in resistance welding?
H=I^2RtK, where
K accounts for energy losses due to radiation and conduction.
Name the components of resistance welding.
Electrode, transformer, cooling systems, AC method, air cylinders, current, resistance, time, and pressure.
What factors contribute to the total resistance in resistance welding?
Electrode resistance
Electrode-workpiece contact resistance
Resistance of individual parts
Workpiece-workpiece contact resistance
List the types of resistance welding.
Spot Welding
Seam Welding
High-Frequency Resistance Welding
Projection Welding
Flash Welding
Stud Welding
Percussion Welding
What is spot welding?
A process using opposing cylindrical electrodes to form a “weld nugget” (6–10 mm diameter).
Where is spot welding commonly used?
Automobile and aeronautical body manufacturing.
What distinguishes seam welding?
It uses opposing wheels/rollers as electrodes to create continuous welds.
Applications of seam welding?
I-sections, containers, mufflers, gasoline tanks, and heat exchangers.
What is projection welding?
A welding process that creates joints through localized heating at projections.
Benefits of projection welding?
Extends electrode life and allows multiple welds in one pass.
What is flash welding?
A type of arc welding where the joint is formed through plastic deformation and removal of contaminants.
Applications of flash welding?
Tubular shapes, metal furniture, windows, and rolling sheet coils.
Who developed the concept of EBM?
Karl-Heinz Steigerwald in 1949.
Q: What is electron-beam welding?
A fusion welding method using high-velocity, narrow electron beams to generate heat.
