English translation: temperature indicating crayons
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Spanish to English translations [PRO] Tech/Engineering - Mechanics / Mech Engineering / PPiston welding
Spanish term or phrase:tizas termicas
7. Proceso de soldadura.
A. Si es acero y va a depositar soldadura de bronce, precaliente aproximadamente a 200º C.
B. Si es fundición precaliente el material aproximadamente de 400º a 600º C, solde y deje enfriar en cal de 12 a 24 horas, esto evita agrietamientos.
C. Verifique siempre la temperatura con tizas termicas.
Explanation: One well-established brand is Tempilstik.
See references. (For the TWI document, it is necessary to register with the site.)
I would tend to avoid references to "thermal chalk" as this term may also be employed for heat-resistant marking products.