Through Arc Seam Tracking (TAST)
TAST is used for providing precise welds depending on specific weld characteristics or in setups where the position of the work piece varies during repetitive tasks.
TAST can be used with the following welding features and processes:
| • | 1-MIG |
| • | Pulse |
| • | WiseFusion |
| • | WiseSteel |
| • | WisePenetration |
| • | MAX Speed |
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Ensure that the robot supports the use of TAST. |
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TAST is configured in the robot and its use varies between robot brands. For more information, refer to the robot manufacturer's instructions. |
The TAST signal is a reference value based on the welding current that is affected by the arc length and the filler wire stick-out length.
TAST requires weaving for horizontal and vertical seam tracking. The figures below show that at the center of the weld seam, the current is at a minimum. As the gun reaches the edge of its weave cycle, the current peaks.
| Gun weaving during seam tracking | TAST signal wave form |
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| 1. Short stick-out length 2. Long stick-out length 3. Short stick-out length |
x = Time y = TAST signal value |
The power source sends the TAST signal as a reference value to the robot that uses the value to keep the stick-out length stable in relation to the weld seam, and make necessary corrections to the welding path.
