MIL-W-80027D
desired. Type I machines shall have provisions to reduce the weld current
at the end of the weld run to a pre-determined value for crater filling.
This reduction in weld current shall be accomplished by a foot or hand con-
trol located at the welding operation.
3.4.4.2 Overload protection control. The control shall have a device to
de-energize the machine in the event of a sustained overload or power fail-
ure. The re-energizing of the machine shall be either manual or automatic.
This control may be a combination control as stated in 3.4.2.1.
3.4.4.3 Stabilization control. A reactor, or other means for control of
the welding control current, shall prevent erratic changes in output under
No evidence of core satura-
all load conditions for all current settings.
tion, which may have an undesirable effect on welding characteristics, shall
The current ripple in the DC output
appear in the output of the machine.
shall be low enough to insure arc stability in critical welding applica-
tion.
3.4.4.4 Remote control. Type I welding machine shall be furnished with a
foot operated control with a minimum of 6 m (20 feet) of electrical cable,
complete with terminal plugs for connecting into the welding machine. The
remote control shall control starting, stopping, and welding currents
throughout the ranges from minimum to maximum corresponding to the range
The foot control
selected on the master current control at the machine.
shall remotely control the starting and stopping of the high frequency
curren , and gas and water flow. The 6 m (20 foot) length of cable on the
remote control is intended only as a standard length and has no bearing on
the distance from the machine the high frequency shall be capable of
producing an arc.
3.4.5 High frequency power unit. A high frequency power unit shall be
included with the type I welding machines and shall require no supplemental
source of power to operate. A switch shall be provided to select high fre-
quency current for starting, or for continuous use during welding opera-
tions, or to make the high frequency current provision inoperative entirely.
An intensity adjustment of high frequency current shall be provided, and
shall be located in close proximity 38 cm (15 inches or less) to the high
frequency current switch.
The design of the unit shall incorporate all
necessary devices to block high frequency feedback to the welding machine,
and to retain rated capacity and other performance characteristics during
all operation for which it is intended.
The output of the high frequency
unit shall supply the required high frequency current at the work station
when using a welding cable at least 7.6 m (25 feet) long.
When required,
high frequency capability, using a cable longer than 7.6 m (25 feet), shall
be furnished as specified (see 6.2.1).
The high frequency unit shall be
capable of producing a spark across a 1.6 mm (1/16 inches) gap between the
workpiece and the electrode when operated in an inert gas atmosphere.
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