Resistance Seam Welding

Question 1

How are resistance seam welding and resistance spot welding similar?

Explain what this welding is?

Answer 1

Resistance seam welding is very similar to spot welding.

This form of resistance welding uses copper roller electrodes to provide a continuous run of overlapping spot welds as the current is activated at set intervals.

Question 2

What may one of the electrodes be driven by?

Answer 2

One of the electrodes may be driven by an electric motor.

Question 3

List the steps for seam welding (5)

Answer 3

1. The materials to be joined are overlapped.
2. Materials are moved between two roller electrodes.
3. Pulses of current are supplied between the roller electrodes frequently.
4. Each pulse is set to last long enough to produce a spot weld, so each pulse creates a spot weld.
5. The time interval is controlled so that these spots overlap by approx 40% of their length along the seam. to create a continuous seam.

Question 4

When drawing a diagram for resistance seam welding, what must be labelled?

Answer 4

The upper and lower electrode wheels, welded metal sheets, overlapping spot welds, AC power supply,

Question 5

What is the heat source of this welding process?

Answer 5

Electric current flowing against the electrical resistance of the material creates heat

Question 6

What are some applications of resistance seam welding?

Answer 6

Domestic radiators, fuel tanks, drums, metal containers

Question 7

What are the 4 pros and 1 con of resistance seam welding?

Answer 7

1. creates a sealed unit
2. economical
3. easily automated
4. suitable for high-volume production
5. restricted to straight lines