Operation; Before You Begin Welding - Pro Spot PHS-101 Instruction Manual

OPERATION

4.0

4.1 BEFORE YOU BEGIN WELDING

Before you begin welding, be sure to read and understand the following instructions.
The Hybrid Spot is a 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 function of this welder before operating it.
ELECTRICITY ONLY: The welder 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 welder 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 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 layers of sheet metal. The resistance in the
metal causes the area to heat up and fuse the sheets together into a nugget.
WELD PROGRAM: Maintaining the air pressure after the current shuts o allows the weld to cool down
under pressure resulting in a harder, stronger weld. This feature is built in to the welder's weld control
program and is engaged automatically during a weld cycle.
TIME: The Timer controls the duration of the current applied during the weld cycle. The idea is to get a
weld that uses higher current and shorter time to control heat buildup.
WELD CYCLE CHART
welder
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