14. they might be used to track the desired weld path ahead of the welding torch.

它们可用于跟踪焊枪前方所需的焊接路径。

In the continuous path case, they might be used to track the desired weld path ahead of the welding torch.

在连续路径的情况下，传感器则用于跟踪测定焊枪按要求应经过的焊接路线。