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Weld monitoring system
Short summary
The arc controlled weld monitoring system enables the adjustment of the programmed welding robot route during welding. Due to deformation of the product under the influence of the heat during the welding process, it is impossible to detect this deformation by means of tactile searching (gas head, laser or similar sensors).
In order to detect this deformation, the arc controlled weld search system can be adjusted. For this function, the welding robot must make a weaving movement in order to make an analysis of the product position during measurements at the deflection points of the weaving movement.
The accompanying drawings give a schematic presentation of the weaving movement and of the measurements if the torch is in the centre of the weld.
Welding current at Amp. 1 is A amperage
Welding current in centre is B amperage
Welding current in Amp. 2 is A amperage
The weld monitoring system will calculate the amount of welding current and determine the difference between SQL and SQR. When the robot is weaving exactly in the centre of the weld, SQL and SQR will be identical.
In case of deformation or incorrect positioning of the product, a deviation will be found by the robot because the weaving movement will not be carried out exactly in the centre of the weld. See the pictures below.
Based on these data, the robot will adjust its position or movement. See the picture below
Mention must be made of the fact that the weld monitoring system will function optimally when the weld form remains unchanged. If the weld form should vary (split form, unequally bevelled, etc.) perfect weld monitoring cannot be guaranteed.