Operation; Before You Begin Welding - Pro Spot PR-2000 Instruction Manual

High frequency inverter resistance spot welder

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PR-2000

4 Operation

Before you begin welding, be sure to read and understand the following instruc-

tions.

The Pro Spot PR-2000 is a state-of-the-art Inverter Resistance Spot Welder that

was designed for the collision repair industry. It duplicates the welding procedure

used by the car manufacturers. It is important to understand the design and func-

tion of this welder before operating it.

ELECTRICITY ONLY: The PR-2000 uses only electricity to create the welds

unlike the MIG welder which uses an arc from a feeding wire to build a weld

nugget using inert gas and the feeding wire material.

PRESSURE: The PR-2000 has a built in air cylinder that compresses the Double-

Sided Gun's welding tips together automatically when triggered. The compression

is an important part of a good resistance weld. The pressure is adjustable from

the Control Panel. The optimum welding pressure varies between 60-90 PSI (4-

6.5 BAR). 90 PSI seems to be a common starting pressure. As a rule, increase

pressure with thicker metals but remember that too much pressure could

decrease the resistance of the metal between the electrodes, resulting in poor

weld penetration.

CURRENT: Another important aspect of a weld is the current applied through the

work piece. A weld is created when a large current is transferred through the lay-

ers of sheet metal. The resistance in the metal causes the area to heat up and

fuse the sheets together in a nugget.

WELD PROGRAM: Maintaining the air pressure after the current shuts off makes

the weld cool down under pressure resulting in a harder, stronger weld. This fea-

ture is built in to the PR-2000's weld control program and is engaged automatical-

ly during a weld cycle.

TIME: The Timer controls the duration of the current applied during the weld

cycle. The ideal is to get a weld that uses higher current and shorter time to con-

trol heat buildup.

4 Operation

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