Joining surfaces heated by electric current and axial compression.The welding process is _____.

In the welding process, the joining surfaces are first brought in contact and then they are heated by the passage of an electric current and once the required temperature is attained, the parts are subjected to an axial compression. This welding process is called as ____.

a. Spot welding
b. Butt welding
c. Seam welding
d. Projection welding

Correct Answer : b. Butt welding
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