PRO WELD INTERNATIONAL ARC 800, Operation/Maitenance Manual

ARC  8 0 0 

PRO 

WEL D 

1. A different and correctly sized chuck and ferrule grip are 
needed for each different stud diameter and style that will be 
welded (see PRO WELD Accessories catalog for help in this 
area). The appropriate chuck, or stud holder, is inserted into 
the tapered chuck adapter and tapped lightly to insure a tight 
fit. The ferrule grip is inserted in the hole in the foot and se-
cured with the locking screws to hold it in place.  

2. Studs must NOT bind or hang up on the foot, ferrule grip, 
or ferrule during the entire stud welding process. To assure 
this, the foot/ferrule arrangement must be centered in relation 
to the stud to be welded. To assure centering, loosen the leg 
screws that hold the foot to the legs. Place a stud in the 
chuck and a ferrule in the ferrule grip. With the leg screws 
loosened, the foot will move freely in all directions. Adjust 
the foot so that the stud is centered in the ferrule and no con-
tact occurs between the stud and the ferrule during retraction 
or forward plunge of the stud.  

3. The “plunge length” is the amount of the stud exposed be-
yond the ferrule during initial set-up. Set the plunge by loos-
ening the leg adjusting screws and moving the foot until the 
stud extends 1/8” to 3/16” past the end of the ferrule. Tighten 
the leg adjusting screws after setting the plunge and recheck 
centering to be sure the stud is aligned properly in the fer-
rule.  

4. The lift height, which determines the arc length, has been 
preset at the factory and will automatically lift and plunge the 
stud during the welding process. “Lift”, is the distance the 
gun will raise the stud above the welding surface during the 
weld. This distance governs the voltage and the arc. Im-
proper lift will cause unsatisfactory welds. Refer to para-
graph 8-1 if it becomes necessary to adjust the lift height.  

5. Make sure that the cables are connected to the power 

will prevent gun triggering and eliminate damage to printed 
circuit boards.  
7.0 CONTROL PANEL DESCRIPTION  

ON/OFF SWITCH  

The ARC-800 is turned “ON” by turning the knob on the 
switch to the “ON” position.  

WELD TIME ADJUSTMENT  

The weld timer regulates duration of the weld current. The 
timer is calibrated in seconds from .05 to .6 seconds.  

WELD CURRENT ADJUSTMENT  

The weld current is adjustable 100-900 Amperes.  

GUN FAULT LED INDICATOR  

The gun fault LED “on” indicates a shorted gun solenoid or a 
shorted control cable. The LED will stay “on” and lock  out 
the gun from triggering.  

TRIGGER LED  

The trigger LED “on” indicates a complete circuit to the unit 
through the gun control cables and gun switch. This LED 
will turn “on” whenever gun trigger is pressed.  

8.0 WELD GUN SET-UP  

8.1  Plunge Length  

Figure 2  

CONTROL PANEL FRONT 

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