During regular inspection of an intercooler in a certain cold storage,cracks were found in the straight edge section of the lower head,resulting in ammonia leakage.On the basis of traditional testing techniques such as ultrasonic thickness measurement and hardness testing,new technologies such as phased array testing and magnetic memory testing have been used to discover 5 transverse crack defects in the straight edge section of the lower head,and corresponding 5 positions have stress concentration phenome-na;And the closer the hardness value is to the heat affected zone,the higher the stress concentration is.Based on comprehensive judgment,multiple defects in the straight edge section of the head of the intercool-er are ammonia stress corrosion cracking.
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