Hobart Welding Products OM-947 manual Duty Cycle And Overheating, Volt-Ampere Curves

4-2. Duty Cycle And Overheating
									Duty Cycle is percentage of 10 min-
									utes that unit can weld at rated load
									without overheating.
									If unit overheats, thermostat(s)
	200								opens, output stops, and cooling
Amperes									fan runs. Wait fifteen minutes for
	135								unit to cool. Reduce amperage or
									duty cycle before welding.
	100								NOTICE − Exceeding duty cycle
Output	80								can damage unit or gun and void
	60								warranty.
	40
	20
	10	2	4	6	8 10		40	60	80100
	1					20
				Duty Cycle %
			20% duty cycle at 85 amps
		2 Minutes Welding				8 Minutes Resting
Overheating
					0				A or V
						15			OR
					Minutes			Reduce Duty Cycle
									duty1 4/95 − 210 517-B

4-3. Volt-Ampere Curves

	28
	26
	24
	22
Voltage	20
	18

16

14

12

10

8

0 10 20 30 40 50 60 70 80 90 100 110 120 130

Amperage

The volt-ampere curves show the minimum and maximum voltage and amperage output capabilities of the welding power source. Curves of other settings fall between the curves shown.

Range 1

Range 2

Range 3

Range 4

ssb1.1 10/91 − 210 518-B

OM-947 Page 12