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Mix recovered flux before reusing to maintain its manufactured properties. Three-parts new flux mixed with one-part recovered flux works well. Consult the flux manufacturer for proper proportions.Fluxes classify as basic, acid, or neutral. Fluxes that contain oxides and break up easily during welding are basic. These provide oxidizing action and alloy with the weld metal airvompressorpressureswitch to obtain desired mechanical properties. Acidic oxides break up slightly, for the same reasons. Welding voltage must remain within the range specified by the manufacturer of acidic and basic fluxes. Excessive airvompressorpressureswitch arc voltage reduces the alloying of flux constituents with the weld metal. Neutral fluxes do not oxidize alloying elements or add alloying airvompressorpressureswitch elements to the weld. As amperages increase, flux particle size should decrease. Excessive current for a particle size produces unstable art''s and uneven weldbead edges.

Duty-Cycle RatingPower-supply rating depends on the type and thickness of the workpiece and the length 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 cycle rating is the percentage of time during a 10-minute period a power supply can operate at rated output amperage without overheating. 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, airvompressorpressureswitch the welder must 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 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 resistance to creep. Shock loading requires impact resistance. In general, weld metal should airvompressorpressureswitch match base-material properties.2. Composition airvompressorpressureswitch of the base material.For stainless steels, low alloy steels, nickel and copper alloys, and materials that serve in corrosive atmospheres, chemical composition is important. Consider the possibility of electrochemical corrosion between base and weld metal of different compositions.

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