In oxy acetylene welding Acetylene gas is closed first to avoid back fire.
46) In oxy acetylene welding which gas is closed first to avoid back fire
Answer is:
Acetylene
Explanation:
Related ISRO Technician-B Fitter Question Paper - 2017 (Set - 1) with Answer Key
Answer is:
723 degree celsius
Explanation:
The lower critical temperature is same for all steels
Lower critical temperature for steel’s austenite-to-pearlite transformation is 1333 ºF (723 ºCelsius). Below this temperature, austentite doesn’t exist.