SA Welder Trade Test Practice Questions - South Africa Artisan Trade Test - Welder (QCTO NAMB) Exam

An E7018 electrode is described as 'low-hydrogen'. Why must these electrodes be kept dry, often in a heated oven?

Moisture makes the flux conduct electricity and trip the welding machine Absorbed moisture introduces hydrogen into the weld, which can cause cold (hydrogen-induced) cracking Damp electrodes weld at a lower temperature and waste current Moisture changes the electrode colour code and causes mislabelling

Correct Answer:

Absorbed moisture introduces hydrogen into the weld, which can cause cold (hydrogen-induced) cracking

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