Question

Why Resistance Spot and Seam Welding are ideal for welding of thin sheets?

Answer 1

in resistance spot and seam welding , heat is generated due to resistance between asperities present between 2

plates to be joint.

and the current applied is very high ranges between 1000 A to 10000 A

there are 4 steps in any resistance welding

1) squeeze time

2) weld time

3) hold time

4) off time

resistance welding is used for joining thin plates ,because if thick plates are used then

1)squeeze pressure required will be more and squeeze time required will also be more otherwise it will not be

sufficient to diffuse 2 plates properly.

2)even higher current has to be supplied which may lead to melting of plates.

3) resistance should be less.