●Seamless alloy tube same ashydro-cylinder
●Much higher nominal loadingtorque of Kelly bars
●Shot Blasting before welding
| Tube Type | Yield strength (MPa) | Tensile strength (MPa) | Reference Standard |
| Seamless thbe same as Hydro-cylinder | ≥835 | ≥980 | GB/T17396 |
●Alloy material heat-treated
●High hardness and highabrasion-resistance
●Single length no less than 9m
4 Upper guide ring
●Three moving rings
●Wear-resistance
●Impact resistance
●Alloy material heat-treated
●High hardness and highabrasion-resistance
●Robot cutting
5 Drive shell
●Robot cutting and welding
●Intergral arc plate
●High wear resistance
|
|
|
|
|
|
6 Terminal joint
●Robot cutting and welding
●Overlapping of intermal andexternal plates
●Small tendency for cracking
7 Anti-friction plate
●Full-rotating
●Reduce wear on pipe endsand stopper plate
8 Tool joint
●Integral forging with leghth no less than1.2meters
●Significantly reduce weld load
Comparation of jionts with defferent length
Professionallsm Builds Quality
|
|