PRO WELD INTERNATIONAL ARC 800, Operation/Maitenance Manual

ARC  8 0 0 

PRO 

WEL D 

source (standard set-up is straight polarity - Negative to con-
troller (or gun) and Positive (ground cable) to the work sur-
face).  

6. Turn on the power supply and adjust the current and time 
for the weld base diameter of the fastener to be welded.  

7. Place the gun, loaded with the stud and ferrule, squarely 
against the grounded work surface. The main spring in the 
gun will take up the “plunge length” and the ferrule will seat 
against the base plate.  

DO NOT MOVE THE GUN DURING THE WELD CY-
CLE  

8. Pull the trigger holding the gun completely still as above. 
The gun will lift the stud from the base plate and draw an 
arc. The end of the stud and the adjacent material of the base 
plate, will be melted by the weld arc.  
The gun will then plunge the stud into the molten pool, extin-
guishing the arc, to end the controlled portion of the weld 
cycle.  

9. After the controlled weld cycle, allow the molten metal to 
solidify briefly with the work surface to assure completion 
of the cycle (about an extra second holding "still" after the 
weld is usually sufficient).  

10. Remove the gun from the work by lifting straight away 
from the welded stud (this will assure better life to the gun's 
expendable accessories). The ferrule may now be removed 
by breaking it away from the welded stud to allow inspect- 

tion of the weld results. After inspection of sample welds the 
gun can be adjusted, as per the step in this procedure, 
for optimum results.  

8.2 Checking Gun Lift  

To measure lift, turn the stud welding unit on and set the 
timer to maximum time. (On certain units there may be a Lift 
Check switch available, and in these cases this switch can be 
used to check lift.) Trigger the gun in the air, or on a 
non-grounded or insulated surface, to observe the lift cycle. 
Measuring the distance the stud or gun mechanism 
moves equals lift - usually this can be easily done by visual 
observation or simple measurement against a static ref- 
erence point (i.e. the ferrule properly seated in the ferrule 
grip).   

                     Recommended Lift Settings.   

                     Stud Base Dia.         Lift Setting   

                     Less than 1/2”              1/16”  
                     1/2” through 3/4”        3/32”  
                     Greater than 3/4”         7/64”  

When it does become necessary to adjust lift, you do so by 
removing the rear cap from the gun. This will expose the 
rear coil yoke assembly, the set screw and the lift adjusting 
screw (Loosen the set screw to avoid damaging the threads 
of the lift adjusting screw).   

To increase lift: turn the lift adjusting screw out (counter 
clockwise).  

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