Question

Misrun is a casting defect which occurs due to

• A. very high pouring temperature of the metal
• B. improper alignment of the mould flasks
• C. insufficient fluidity of the molten metal
• D. absorption of gases by the liquid metal

Answer 1

The correct option is C insufficient fluidity of the molten metal

If molten metal is too cold, entire mould cavity may not be filled during pouring before the metal starts solidifying and the result is 'misrun'

Causes of Misrun

(i) Too cold molten metal
(ii) Too small gates,
(iii) Too thin casting section
(iv) Too many restrictions in gating system
(v) Metal lacking fluidity