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Manufacturing Process
Pipe Selection

Conditions for selecting raw pipes:
a. The raw materials we purchase for producing drill pipes should meet the API standards.
b. The elements of pipes should be in accordance with the technical requirements of drill pipes
c. Selecting suppliers in compliance with the quality and regulatory requirements
d. Establishing stable quality assurance system and partnership agreement
e. Shot blasting treatment for some materials to enhance their hardness

Processing Equipment: circular saw, shot blasting machine
Control Equipment: elemental spectrometer

Forging and Heating

Key Points:
a. Non-destructive control upon high-frequency heating
b. Heating time, temperature, and heated length
c. Tooling design for high-frequency induction heating

Processing Equipment: high frequency induction heating furnace
Control Equipment: temperature detector

Pipe Upsetting

Key Points:
a. Non-destructive multiple stamping technique
b. Temperature and heating time control upon workpieces
c. Smoothness of the inner/outer wall of the transition section
d. Tooling design for molds used for upsetting pipes basing on the pipe diameter and pipe end upsetting design

Processing Equipment: upsetting and forging equipment

Pipe End Roughing

Key Points:
a. Ensuring the right pipe dimension
b. Checking the upsetting defects

Processing Equipment: CNC lathe

Quenching and Tempering

Key Points:
a. Ensuring the quenching and tempering treatment is in line with technical requirements
b. Tempering treatment for pipes to eliminate internal stress
c. Control upon temperature, time and quenching medium
d. Hardness test (100% pass rate)
e. Amounts of workpieces tested should be no lower than the standards in testing manual

Processing Equipment: high-temperature quenching and tempering treatment production line for pipes
Control Equipment: temperature detector, time monitor, hardness tester, testing instrument for various mechanical and physical properties

Flaw Detection

Key Points:
a. 100% flaw detection for all of the pipes
b. Destructive tests of mechanical properties by sampling
c. Control upon quenching and tempering process
d. Metallographic examination
e. Hardness test
f. Tests for various mechanical properties

Control Equipment: ultrasonic flaw detector, magnetic particle tester

Pipe Straightening

Key Points:
a. Concentricity of pipes when rotating
b. Concentricity of straightened pipes
c. Defect detection after straightening

Processing Equipment: straightening machine

Pipe Tempering

Key Points:
a. High-temperature tempering for welding seams to prevent cracks and eliminate internal stress
b. Induction coil is set in the high-temperature tempering process to ensure the workpieces are heated uniformly
c. Tempering temperature and time
d. Insulation environment and cooling time

Processing Equipment: high frequency induction tempering equipment, time monitoring device

Control Equipment: ultrasonic flaw detector, hardness tester

Thread Processing

Key Points:
a. Standard test with thread gauge
b. Test with thread detector
c. Thread turning tools
d. 100% test for thread processing
e. Thread finish test

Processing Equipment: CNC threading lathe
Control Equipment: standard thread gauge, thread taper gauge, thread height tester

Pipe Thread Inspection

Key Points:
a. 100% test for pipe thread
b. Test with standard thread gauge
c. Test with thread detector
d. 100% test for thread forming
e. Thread finish test

Testing Equipment: standard thread gauge, thread detector

Laser Quenching for Pipe Thread

Key Points:
a. Making Nitriding solution
b. Surface cleaning treatment before putting workpieces into the furnace
c. Control upon tempering temperature and time
d. Nitride layer inspection

Processing Equipment: laser quenching machine
Control Equipment: Metallographic analyzer, hardness tester, temperature detector

Friction Welded Pipe

1. Friction Welded Pipe: Welded Joints
Key Points
a. Parameter settings and sampling for welding workpieces
b. Micro-adjustment for concentricity of pipes
c. Coolant of spraying system for welding seams
d. Friction welding machine configuration
e. Data recorded by the intelligent technical parameter recording system of friction welding machine

Manufacturing Equipment: intelligent CNC friction welding machine
Inspection Equipment: ultrasonic flaw detector, hardness tester

2. Friction Welded Pipe: Welding Seam Tempering
Key Points:
a. Tempering treatment for preventing cracks and eliminating internal stress
b. Induction coil is set for high-temperature tempering to ensure that the workpieces are heated uniformly
c. Control upon tempering temperature and time
d. Control upon insulation environment and cooling time

Manufacturing Equipment: High frequency induction tempering equipment, time monitor
Control Equipment: Ultrasonic flaw detector, hardness tester

3. Friction Welded Pipe: Pressure Test for Welding Seams
Key Points:
a. Pressure test for welding seams of friction welded pipe to ensure there is no defect on the seams
b. Pressure test design
c. Pipe concentricity

Processing Equipment: hydraulic press

4. Friction Welded Pipe: Magnetic Particle Test for Welding Seams
Key Points
a. 100% magnetic particle test for welding seams
b. Ensuring that the magnetic particles rotate and spray uniformly
c. Parameter setting for detector
d. Proficiency of operators (special certificates are required)

Testing Equipment: magnetic particle detector

Wear-Resistant Part Welding

Key Points:
a. Insulation technique
b. Control upon the welding current
c. Controlling the rotation speed of joints to ensure the smoothness of welded surface and uniform thickness

Processing Equipment: welding machine
Inspection Equipment: hardness tester

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