ANALYSIS OF TEETHCLAMP SURFACE CRACK

Surface crack on teethclamp was studied by means of macroscopic and metallographic examination. The results showed the teethclamp was forged in oilfurnace,heating temperature was not controlled and heating-time was too long,forging-temperature was too high,so the surface had appeared over-burnt and the inside of teethclamp was severely over-heating. When gillhole was enlarged and handlearc was formed after annealed,the surface shallow crack and chap appeared.