GMAW chapter 3

welding power supplies are made to operate on _ or _ phase primary current

Alternating current or three

the time period is based on a _ minute period.

10 minute period

The power supply produces welding current at _ voltages

110,208,230,or 460 volts & generally 60 hertz(cycles)

the time at rated load at which the machine will operate w/o harm to the machine is called the machine_ _.

Duty cycle

the gun cable is connected to the wire feeder by the use of an _.this equipment is usually made by the gun manufacture and fits the manufacture's equipment.

adapter

guns are rated by _ _, in the same way as a power supplies are rated.

duty cycle

the electrical current produced by the power supply is transferred to the electrode through the _ _

contact tip

when setting up a machine for spray-arc welding and slope adjustment is available the slope is set in the _ mode

flat

arc outages in the short arc mode are generally caused by a faulty _ connection

ground

the word _ is used to express the number of cycles of input electrical current

hertz

a welding machine manufacturer's guarantee on equipment is called the machine _.

warranty

another name for the inductance is _ _ it relates to the rate of rise of welding current when the electrode is in contact with the work piece in the short arc mode

pinch effect

the three types of wire feeders include the _ type the _ type and the _-_ type

push, pull,push-pull

adjustment of the inductance control aids in obtaining _ reducing _ and obtaining a _ welding crown

more fluid weld pool, spatter, smoother

when setting up a machine for short -arc welding and slope adjuctment is available the slope is set in the _ mode

steep

the _ of the volt ampere curve is actually the operating characteristics of the welding machine output

slope/slant

the letters OCV with regard to welding power supplies define the _ _ _ established on the machine

open circuit voltage (OCV)

wire feeders generally use 110 volts input current while gun motors will have a _ voltage for the safety of the welder

24 V

the actual arc voltage established on the machine after welding begins may also be referred to as _ voltage

Arc or Load voltage

welding guns which use the push pull system use wheels with _ _ that pull the wire from the wire feeder slave unit.

Spool guns . . . drive rollers

wire feeders have either a _ -or _ roll drive system. the _ roll system is used where precision drive of the filler wire is required

Two, Four, four

all welding power supplies have a _ output current which is established by the design of the machine to _ spec.

limited, manufacture

a _ is used in the gun cable to protect ti from _ of wire it is installed in the cable with specific instructions for assembly into the gun adapter

liners, type and size

When welding with the short- arc mode the machine OCV is generally set in the _ end of the range, while the spray-arc mode requires setting on the _ voltage range.

low, middle

proper _ of welding equipment will extend the life of the equipment for a long period of time and reduce the number of major repairs

maintenance