Ductile iron pipe quality billet surface defect treatment process of nodular cast
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pipe cleaning pipe billet surface defect process method is as follows: pickling (
Or shot blasting)
'Grinding processing grinding method is: pneumatic shovel treatment, flame treatment, grinding wheel grinding, multiple blade milling and lathe peeling, etc.
Pneumatic shovel handle is a common way to clean up the local defects or larger defects.
When cleaning up to do clean thoroughly, smooth edges, wide depth ratio should be greater than 6.
Clear the depth should not exceed 5% of the pipe diameter.
This method the intensity of labor is larger.
Scarfing is mainly used for low carbon steel and medium carbon steel.
Grinding wheel is mainly used for alloy pipe or pneumatic shovel handle hard tube billet.
In order to improve the efficiency of grinding wheel repair to reduce Labour intensity.
For some of the alloy with high alloy steel tube billet to adopt skinning (
To deal with.
Along the pipe billet diameter cutting amount)
Generally for 5 ~ 10 mm.
Peeling process can remove more surface defects, and is easy to find its internal defects.
Many foreign manufacturers of tube billet by 100% peeling processing, yields significantly.
Check has been widely used at present, the tube billet defects ultrasonic testing and magnetic inspection, NDT testing method to find the tube billet internal defects, thus helps to ensure the quality of the finished tube.
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