aluminum air tamk

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

1. Mechanical properties of the base material. Tensile strength and yield strength aluminum of the weld metal should equal or exceed that of the base material. Ductility and toughness at low temperatures may also be important. High-temperature service requires air resistance to creep. Shock loading tamk requires impact resistance. aluminum In general, weld metal should match base-material properties.2. Composition of the base material.For stainless steels, low alloy steels, nickel and copper alloys, and materials air that serve tamk in corrosive atmospheres, chemical composition is important. Consider the possibility of electrochemical corrosion between base and weld metal of different compositions.

Welding-site aluminum conditions and welding-wire diameter air govern efficiency and size of power supply required for a job. Select a 100-A unit that runs from single-phase 115-V input for low-duty-cycle welding of sheet to l/s tamk in. thick, feeding wire to 0.030-in. diameter. Medium-duty aluminum power supplies, 150-200 A, normally take single-phase 220-V input to weld steel to 3/16, in. air and 0.035-in. wire at low-duty cycles. For high-duty cycles, tamk as aluminum in mechanized welding, select a 250-A machine, single or three-phase input at various voltages-these weld material to 1/2 in. thick with wire as large as 0.045-in. diameter. air Taking three-phase input only and wire up to 1/6-in. diameter, 400-A units serve for mechanized tamk continuous-welding applications. For pulsed GMAW, shops use inverter and transistor power sources, constant-current or constant-voltage, that offer independent setting of pulse parameters. They employ synergic controls preprogrammed for a range of wire-feed speeds-the operator sets only one dial, for average current.

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