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HAND SHIELD. A protective device, used in arc welding, for shielding the face and neck. A hand shield is equipped with a suitable filter lens and is designed to be held by hand.
HEAT-AFFECTED ZONE. That portion of the base metal which has not been melted, but whose mechanical properties or microstructure have been altered by the heat of welding, brazing, soldering, or cutting.
HEAT TIME. The time that current occurs during any one impulse in multiple-impulse welding or when making welds by resistance welding.
HELMET. A protective device, used in arc welding, for shielding the face and neck. A helmet is equipped with a suitable filter lens and is designed to be worn on the head.
HOLD TIME. The time during which force is applied at the point of welding after the last impulse of current ceases in resistance welding.
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