Inner scarfing system
The inner scarfing system originated from Germany; it is simple in design and highly practical.
The inner scarfing system is made of high-strength elastic steel, which has the characteristics of high strength, high temperature resistance and corrosion resistanceafter special heat treatment,
It has small deformation and strong stability when working under high temperature conditions.
It is suitable for high-precision thin-walled welded pipes and has been used by many domestic welded pipe companies for many years.
The inner scarfing system is offered as per the steel tube diameter.
The structure
1)scarfing ring
2)scarfing ring screw
3)Guide roller
4)Jacking screw for lower support roller
5)Guide roller
6)Connection rod
7)Impeder
8)Traction cooling tube
9)Tool holder
10)Lower support roller
11)Water fittings
The installation :
Place the inner scarfing system between the fist fine pass stand and welding section .
The adjustment bracket is installed on the fist fine pass stand(figure-3).the end of impeder should exceed the squeezing roller center line by 20-30mm, meanwhile, the scarfing ring is maintained between 2 outside burr scarfing tool the cooling water should be provided to the inner scarfing system at pressure 4--8Bar.
The usage condition of inner scarfing systen
1)The good quality and flatness strip steel are required to manufacture steel tube
2)Some 4-8bar pressure cooling water are needed to cool the ferrite core of inner scarfing system
3)The welded seam of 2 end of strips must be flattness, it is better to grind the welded seam by angel grinder ,this can avoid scaring ring broken.
4)The inner scarfing systen removes the welded pipe material:Q235,Q215, Q195(or equivalent) . The wall thickness is 0.5 to 5mm.
5)Clean the lower support roller to avoid oxide skin of the stuck on lower support roller .
6)The accuracyof internal burrs after scarfing should be -0.10 to +0.5 mm.
7)The welded seam of tube must be stable and straight. add the lower support roller under the outer burr sacarfing tool.
.8)Make a proper opening angle.
9)The ferrite core with high magnetic flux should be used inside of imperder of inner scarfing system.it leads to high sppeed welding
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