English to Spanish Other Engineering (general)

Hola a todos:
¿Puede alguient ayudarme con la traducción de collapse en este contexto?
Se trata de un manual de una máquina para soldar plástico con láser.
Ejemplos:
Close loop:
marking mode in which it is the collapse distance of the piece to be welded that stops the laser when the established target is reached

This way the machine will perform several numbers of collapses to the piece (value configured from settings by the service user) in order to accurately locate the reference

Nº max steps to weld minimum collapse: poka-yoke to determinate if a minimum collapse must be done with a max nº of laser steps

Muchas gracias