Q 01/05

Until the end of the 19th century, what was the only process available for joining iron and steel?

A) Brazing

B) Soldering

C) Riveting

D) Forge welding

Answer · why

D) Forge welding

Blacksmiths joined iron and steel by heating and hammering for millennia. The Iron Pillar of Delhi, from around 400 CE, was made this way.

Q 02/05

The earliest known welding dates to which period?

A) The Stone Age

B) The Roman era

C) The Middle Ages

D) The Bronze Age

Answer · why

D) The Bronze Age

Small gold boxes made with pressure-welded lap joints survive from that era. Forge welding of iron came later, in the Iron Age.

Q 03/05

Which scientist discovered the short-pulse electric arc in 1800, laying the groundwork for arc welding?

A) Michael Faraday

B) Alessandro Volta

C) André-Marie Ampère

D) Humphry Davy

Answer · why

D) Humphry Davy

He presented the results in 1801 and rediscovered the continuous arc in 1808, unaware that Vasily Petrov had already done so in Russia.

Q 04/05

Nikolay Benardos introduced the first practical arc welding method in 1881. What kind of electrodes did it use?

A) Tungsten

B) Coated steel

C) Carbon

D) Copper

Answer · why

C) Carbon

He developed it with Polish engineer Stanisław Olszewski in a French lab; they received a British patent in 1885. He called the process Elektrogefest.

Q 05/05

The first patents for resistance welding, in 1885, went to which American inventor?

A) Thomas Edison

B) George Westinghouse

C) Nikola Tesla

D) Elihu Thomson

Answer · why

D) Elihu Thomson

He kept improving it for 15 years. His company later merged into General Electric.