What does Technician B claim about tack welding plastic parts?

Tack welding plastic parts is primarily used to temporarily hold components in place while they are being properly secured or completed. The process involves applying a small, localized weld that ensures the parts remain aligned during subsequent steps, such as full welding or additional assembly. This alignment is crucial, as it helps prevent any misalignment issues that could arise later in the repair or manufacturing process.

Using tack welds allows technicians to assess fit and adjust as necessary before committing to a permanent attachment. It also minimizes the risk of distortion that might occur in the parts due to heat expansion, as the tack welds only apply heat to specific areas. Hence, the claim that it helps hold the sides in alignment is accurate and highlights an essential aspect of working with plastic parts in auto body repair.