Keys when heating mandrel before pushing elbow from induction elbow machine:
Firstly, move coil to front to cover the mandrel head,to keep all mandrel head are within scope of coil to 100% absorb magnetic field hot.
2.5 hours is not enough for 530 mandrel,it is should take 5-6 hours(depend on heating temperature) ,when you see the mandrel is Red,near white color,means it is well .
Then move the coil to push position .
Note: 1. do not heat connect part between mandrel head and connection pole for long time,it is very easy to broken there after long time heating.
2. Put more graphite inside to ensure pipe is smooth moving during pushing,if less graphite,it will have big noise during machine working.
3. Keep pipe cuts end is smooth,no burr,otherwise the end face is easy to insert of mandrel and cannot get good shape of elbows,also,use slow speed to start pushing,when you see the pipe is climb to mandrel head,can raise speed. You can ready a water gun,during pipe climb to mandrel head,if you see it is insert or roll,just give strong water to decrease temperature of the problem part.
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