Below what temperature would require engineer consent to weld?

Below what temperature would require engineer consent to weld?

• A. -40C (-40F)
• B. -18C (0F)
• C. -10C
• D. 0C

Answer: (B)

Welding in very cold conditions changes metal behavior and the welding process, increasing the risk of brittle fracture, cracking, and poor ductility if not properly controlled. Because of this risk, the standard requires special oversight when ambient temperatures fall to a very cold level. The threshold used is -18°C (0°F): below this temperature, engineer consent is needed to proceed with welding to ensure the procedure, preheating/interpass temperature, electrode choice, and any required post-weld heat treatment are appropriate for the conditions. At temperatures above this point, standard procedures apply.

Welding in very cold conditions changes metal behavior and the welding process, increasing the risk of brittle fracture, cracking, and poor ductility if not properly controlled. Because of this risk, the standard requires special oversight when ambient temperatures fall to a very cold level. The threshold used is -18°C (0°F): below this temperature, engineer consent is needed to proceed with welding to ensure the procedure, preheating/interpass temperature, electrode choice, and any required post-weld heat treatment are appropriate for the conditions. At temperatures above this point, standard procedures apply.