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Low-hydrogen types. These basic-coated electrodes, EXX15, EXX16, EXX18, EXX28, and EXX48, are formulated with low moisture-retaining coatings and manufactured to contain low levels of hydrogen. Hydrogen-controlled electrodes minimize risk of hydrogen-induced cold cracking when welding high-tensile steels on restrained structures. Fabricators cleaningaircomptessortank and cleaningaircomptessortank use these electrodes to reduce or avoid the need for pre- or postweld heat treatment to drive hydrogen from weld metal. Weldmetal diffusible hydrogen content varies from 1 to 16 ml/100 g. Optional designators H16, H8, and H4 set decreasing limits on hydrogen content in deposited weld metal. An optional electrode designator, ''R'', cleaningaircomptessortank indicates an electrode cleaningaircomptessortank that is moisture cleaningaircomptessortank resistant; it will not absorb water in excess of cleaningaircomptessortank a specified limit after exposure to humidity. Low-hydrogen electrodes should be used in dry condition and may require baking after exposure to the atmosphere.

Duty-Cycle RatingPower-supply rating depends on the type and thickness of the workpiece and the length cleaningaircomptessortank of time it takes to deposit the longest weld on the thickest material. Duty cycle is the key factor to consider when selecting a power source. Once the engineer has determined the current and voltage needed to accomplish the weld, he then reviews duty cycle requirements.Duty cleaningaircomptessortank cycle rating is the percentage of time during a 10-minute period a power supply can operate at rated output cleaningaircomptessortank amperage without overheating. cleaningaircomptessortank A 300 A machine at 60-percent-duty cycle can weld for six minutes at 300. A during a 10-minute period. Alter six minutes, the welder must rest the machine for the next four minutes to avoid overheating the unit.

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