4.2.2. Welding sequence by gun type
4.2.2. Welding sequence by gun type
The controller carries out the welding operation by executing SPOT command to the program. The playback of the spot welding function varies by gun type, as follows.
4.2.2.1.Servo-gun
If the gun type is servo-gun, the playback of spot welding function will be carried out as shown below.
Figure 4.6 Playback of servo-gun spot welding
(1) In the N-1 step position, the moving tip and the fixed tip will move to the position where they are distant as much as the “moving tip clearance” and the “fixed tip clearance” individually.
(2) The fixed tip moves to the record location of the step through the robot equalizing operation, and the moving tip moves to the record location of the step by shifting to compensate for consumption.
(3) The moving tip carries out squeeze at the set squeeze force. When the squeeze alignment is achieved, the welding execution signal will be output together with the welding condition signal at that location.
(4) When the welding complete signal (WI) is received, both the moving tip and the fixed tip will be opened sufficiently for clearance.
(5) Continue to the next step.
4.2.2.2.EQless-gun
If the gun type is EQless-gun, the playback of spot welding function will be carried out as shown in the picture below.
Figure 4.7 Playback of EQless-gun spot welding
(1) From N-1 step location, the fixed tip moves to a location at a distance of ‘fixed tip clearance’ from the record location.
(2) The fixed tip moves to the record location of the step through the robot equalizing operation, and the moving tip squeezes the panel using air pressure.
(3) When the squeeze alignment is achieved, the welding execution signal will be output together with the welding condition signal at that location.
(4) When the welding complete signal (WI) is received, the fixed tip moves to a location from the record location that is equal to the fixed tip clearance, and the moving tip moves to a location where air pressure is not supplied.
(5) Continue to the next step.
4.2.2.3.Eq-gun
If the gun type is Eq-gun, the playback of spot welding function will be carried out as shown in the picture below.
Figure 4.8 Playback of Eq-gun spot welding
(1) Move from N-1 step location to the record location of the step.
(2) Output the welding execution signal together with the welding condition signal. Squeeze the panel with equalizing equipment if the fixed tip is used and with air pressure if the moving tip is used.
(3) When the welding complete signal (WI) is received, the fixed tip will move to a location where equalizing equipment is not operated, and the moving tip will move to a location where air pressure is not supplied.
(4) Continue to the next step.