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4.0 Operation
4.1 Before You Begin Welding
Before you begin welding, be sure to read and understand the following instructions.
The Pro Spot i4s is a state-of-the-art Resistance Spot Welder that was designed for the collision repair industry. It is
important to understand the design and function of this welder before operating it.
Before you begin welding with the i4s:
Squeeze Force: The i4s double-sided gun contains an air cylinder that is capable of compressing the weld caps against
the weld stack up to 1000 lbs. In Auto Mode, the i4s automatically adjusts the squeeze force to maximize fusion of ma-
terials and minimize expulsion during the welding.
Energy: In Auto Mode, the i4s controls and monitors the amount of energy delivered to each weld which ultimately
determines the overall quality of the weld. Perform regular destructive tests on the metal you are welding to validate the
weld no matter which mode you are in.
Current: Another important aspect of a weld is the current applied through the work piece. A weld is created when the
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 in a nugget.
Weld Program: Maintaining the air pressure after the current shuts off makes the weld cool down under pressure re-
sulting in a harder, stronger weld. This feature is built in to the i4s weld control program and is engaged automatically
during a weld cycle.
Time: The Time controls the duration of the current applied during the weld cycle.
4.0 Operation 4.1 Before You Begin Welding
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